CV with publications W.J. Chardon

Curriculum Vitae W.J. Chardon, retired, Wageningen

International refereed papers

Refereed papers, in Dutch

Contributions to books; theses

Reports & non-refereed papers

Abstracts, posters, etc.

Curriculum Vitae

Name, title, function: W.J. Chardon PhD, Retired since 2020

Date of birth: June 10th 1954

Scientific education: Agricultural University Wageningen

Previous experience:

1985 - 2020: Research scientist at institutes IB-DLO, AB-DLO, Alterra Wageningen UR, Wageningen Environmental Research
topics:
* Developing filters for retaining phosphorus in the landscape.
* Behavior of phosphorus in soil, sorption kinetics, leaching, soil depletion, nature development, immobilization.
* Leaching of nitrate, correlation with soil factors.
* Emission of fine dust from agricultural activities.
* Ammonia emission from application of manure.

April 1984 - March 1985: Consultancy company IWACO, Rotterdam
* Consultant on soil pollution

Feb. 1984: PhD. Agricultural University, Wageningen

Sept. 1983 - March 1984: Waterloopkundig Laboratorium, location Haren.
* Determination of an element balance for contaminants for the North Sea

Jan. 1978 - mid 1983: Agricultural University, Wageningen
* Research project for the Ministry of Public Health and Environmental Quality on factors that determine the mobility of cadmium in soil

Professional activities:

10-10- 2020: Retirement
2017 - 2020: Vice-chair Central Participation Council Wageningen UR
2017 - 2020: Vice-chair Central Participation Council Wageningen UR
2014 - 2017: Member Central Participation Council Wageningen UR
2014 - 2021: Member Participation Council Environmental Sciences Group, Wageningen UR
2013 - present: Member editoral board journal Bodem [in Dutch]
2006 - 2011: Chairman of COST (EU Program Co-operation in Science and Technology) Action 869: 'Mitigation options for nutrient reduction in surface water and groundwaters'. Members from 30 European countries contributed to this COST Action.
2002 - 2007: Associate editor Journal of Environmental Quality
1999 - 2020: Regular manuscript reviewer of e.g. J. of Environmental Quality, Soil Science Society America J., Geoderma, Soil Science, European J. of Soil Science, Plant and Soil, Australian J. of Soil Research, Agricultural and Food Science in Finland, J. Plant Nutrition and Soil Science, Applied Geochemistry.
2004: Organiser of the 4th International Phosphorus Workshop, Wageningen, The Netherlands, topic: 'Critical evaluation of options for reducing phosphorus loss from agriculture'. The workshop was attended by 81 delegates from 18 countries.
2004, 2015: Co-promotor of PhD candidates: G.F. Koopmans, O.F Schoumans
1999 - 2021: Examinator or member commission PhD thesis: M. Hens, Belgium; E. Turtola, R. Uusitalo Finland; P. Demaria, Switzerland; J. Liu, Sweden; G. Lyngsie, E. Canga, Denmark; H. Andersson, Sweden; M. Riddle, Sweden; J. Rolighed, Denmark
1997 - 2003: Vice-chairman of COST (EU Program Co-operation in Science and Technology) Action 832: 'Quantifying the Agricultural Contribution to Eutrophication'. Members from 17 European countries contributed to this COST Action.
1990 - 2003: Member Commission Emissions from Agriculture
1995 - 2002: Chairman Commission Soil Properties Dutch Standardization Institute NNI
1985 - 1999: Member standardization Commission Soil Quality Dutch Standardization Institute NNI

Professional Associations:
* Member, Dutch Society of Soil Science (NBV)

International refereed papers

Chardon, W.J., J.E. Groenenberg, J.P.M. Vink, A. Voegelin, and G.F. Koopmans. 2021?. Reducing phosphorus loading of surface water using reactive materials. J. Environ. Qual. in preparation.

Koopmans, G.F., T. Hiemstra, C. Vaseur, W.J. Chardon, A. Voegelin, and J.E. Groenenberg. 2020. Use of iron oxide nanoparticles for immobilizing phosphorus in-situ: Increase in soil reactive surface area and effect on soluble phosphorus. Sci. Total Environ. 711. LINK
Jansen, S., R. Stuurman, W.J. Chardon, S. Ball, J. Rozemeijer, and J. Gerritse. 2019. Passive dosing of organic substrates for nitrate-removing bioreactors applied in field margins. J. Environ. Qual. 48:394-402. LINK
Schoumans, O.F., and W.J. Chardon. 2015. Phosphate saturation degree and accumulation of phosphate in various soil types in The Netherlands. Geoderma 237–238:325-335. LINK
Schoumans, O.F., W.J. Chardon, M.E. Bechmann, C. Gascuel-Odoux, G. Hofman, B. Kronvang, G.H. Rubæk, B. Ulén, and J.-M. Dorioz. 2014. Mitigation options to reduce phosphorus losses from the agricultural sector and improve surface water quality: a review. Sci. Total Environ. 468-469:1255-1266. LINK
Haygarth, P.M., A. Delgado, W.J. Chardon, M.I. Litaor, F. Gil-Sotres, and J. Torrent. 2013. Phosphorus in soils and its transfer to water: from fine scale soil processes to models and solutions in landscapes and catchments. Soil Use Manage. 29(Suppl. 1):1-4. LINK
Groenenberg, J.E., W.J. Chardon, and G.F. Koopmans. 2013. Reducing phosphorus loading of surface water using iron-coated sand. J. Environ. Qual. 42:250-259. LINK
Klimeski, A., W.J. Chardon, R. Uusitalo, and E. Turtola. 2012. Potential and limitations of phosphate retention media in water protection: A process-based review of laboratory and field-scale tests. Agric. Food Sci. 21:206-223. LINK
Turtola, E., and W.J. Chardon. 2012. Preface [to special issue of AFS gathering current Finnish research on novel methods for reducing agricultural nutrient losses to water bodies]. Agric. Food Sci. 21:204-205. LINK
Buda, A.R., G.F. Koopmans, R.B. Bryant, and W.J. Chardon. 2012. Emerging technologies for removing nonpoint phosphorus from surface water and groundwater: Introduction. J. Environ. Qual. 41:621-627. PDF
Chardon, W.J., J.E. Groenenberg, E.J.M. Temminghoff, and G.F. Koopmans. 2012. Use of reactive materials to bind phosphorus. J. Environ. Qual. 41:636-646. LINK
Stutter, M.I., W.J. Chardon, and B. Kronvang. 2012. Riparian buffer strips as a multifunctional management tool in agricultural landscapes: Introduction to the special collection. J. Environ. Qual. 41:297-303. PDF
van der Salm, C., A. van den Toorn, W.J. Chardon, and G.F. Koopmans. 2012. Water and nutrient transport on a heavy clay soil in a fluvial plain in the Netherlands. J. Environ. Qual. 41:229-241. LINK
Ros, G.H., C. Tschudy, W.J. Chardon, E.J.M. Temminghoff, C. van der Salm, and G.F. Koopmans. 2010. Speciation of water extractable organic nutrients in grassland soils. Soil Sci. 175:15-26.
van der Salm, C., W.J. Chardon, P.A.I. Ehlert, G.F. Koopmans, and J.C. van Middelkoop. 2009. Phytoextraction of phosphorus-enriched grassland soils. J. Environ. Qual. 38:751-761. LINK
Chardon, W.J. , and O.F. Schoumans. 2007. Soil texture effects on the transport of phosphorus from agricultural land in river deltas of Northern Belgium, The Netherlands and North-West Germany. Soil Use Manage. 23 (Suppl. 1):16-24.
Chardon, W.J. , G.H. Aalderink, and C. van der Salm. 2007. Phosphorus leaching from cow manure patches on soil columns. J. Environ. Qual. 36:17-22. LINK
Koopmans, G.F., W.J. Chardon, and R.W. McDowell. 2007. Phosphorus movement and speciation in a sandy soil profile after long-term animal manure applications. J. Environ. Qual. 36:305-315. LINK
Koopmans, G.F., W.J. Chardon, P.H.I. Dekker, P.F.A.M. Römkens, and O.F. Schoumans. 2006. Comparing different extraction methods for estimating phosphorus solubility in various soil types. Soil Sci. 171:103-116.
Chardon, W.J. , and G.F. Koopmans. 2005. Phosphorus Workshop - Introduction. J. Environ. Qual. 34:2091-2092
Visser, S.M., L. Stroosnijder, and W.J. Chardon. 2005. Nutrient losses by wind and water, measurements and modelling. Catena 63:1-22.
Koopmans, G.F., W.J. Chardon, and C. van der Salm. 2005. Disturbance of water-extractable phosphorus determination by colloidal particles in a heavy clay soil from the Netherlands. J. Environ. Qual. 34:1446-1450. LINK
Koopmans, G.F., W.J. Chardon, P. de Willigen, and W.H. van Riemsdijk. 2004. Phosphorus desorption dynamics in soil and the link to a dynamic concept of bioavailability. J. Environ. Qual. 33:1393-1402. LINK
Koopmans, G.F., W.J. Chardon, P.A.I. Ehlert, J. Dolfing, R.A.A. Suurs, O. Oenema, and W.H. van Riemsdijk. 2004. Phosphorus availability for plant uptake in a phosphorus-enriched noncalcareous sandy soil. J. Environ. Qual. 33:965-975. LINK
Chardon, W.J., and P.J.A. Withers. 2003. Introduction to papers from the EU COST Action 832 "Quantifying the agricultural contribution to eutrophication". J. Plant Nutr. Soil Sci. 166:401.
Schoumans, O.F., and W.J. Chardon. 2003. Risk assessment methodologies for predicting phosphorus losses. J. Plant Nutr. Soil Sci. 166:403-408.
Koopmans, G.F., W.J. Chardon, J. Dolfing, O. Oenema, P. van der Meer, and W.H. van Riemsdijk. 2003. Wet chemical and phosphorus-31 nuclear magnetic resonance analysis of phosphorus speciation in a sandy soil receiving long-term fertilizer or animal manure applications. J. Environ. Qual. 32:287-295. LINK
Koopmans, G.F., R.W. McDowell, W.J. Chardon, O. Oenema, and J. Dolfing. 2002. Soil phosphorus quantity-intensity relationships to predict increased soil phosphorus loss to overland and subsurface flow. Chemosphere 48:679-687.
Koopmans, G.F., M.E. van der Zeeuw, P.F.A.M. Römkens, and W.J. Chardon. 2001. Identification and characterization of phosphorus-rich sandy soils. Neth. J. Agric. Sci. 49:369-384.
Koopmans, G.F., M.E. van der Zeeuw, W.J. Chardon, and J. Dolfing. 2001. Selective extraction of labile phosphorus using dialysis membrane tubes filled with hydrous iron hydroxide. Soil Sci. 166:475-483.
Chardon, W.J. 2000. Comments on 'Empirical modelling of the kinetics of phosphate sorption to macropore materials in aggregated subsoils' by H.C.B. Hansen, P.E. Hansen & J. Magid. Eur. J. Soil Sci. 51:537-538.
Dolfing, J., W.J. Chardon, and J. Japenga. 1999. Association between colloidal iron, aluminum, phosphorus, and humic acids. Soil Sci. 164:171-179.
Chardon, W.J., and D. Blaauw. 1998. Kinetic Freundlich equation applied to soils with a high residual phosphorus content. Soil Sci. 163:30-35.
Chardon, W.J., O. Oenema, P. del Castilho, R. Vriesema, J. Japenga, and D. Blaauw. 1997. Organic phosphorus in solutions and leachates from soils treated with animal slurries. J. Environ. Qual. 26:372-378. LINK
Menon, R.G., S.H. Chien, and W.J. Chardon. 1997. Iron oxide-impregnated filter paper (Pi test): II. A review of its application. Nutr. Cycl. Agroecosyst. 47:7-18.
Chardon, W.J., R.G. Menon, and S.H. Chien. 1996. Iron oxide impregnated filter paper (Pi test): a review of its development and methodological research. Nutr. Cycl. Agroecosyst. 46:41-51.
del Castilho, P., J. Bril, W.J. Chardon, P.F.A.M. Römkens, and O. Oenema. 1996. Effect of changes in soil factors on soil solution cadmium. Hrvatske Vode 4 (15):125-134.
del Castilho, P., and W.J. Chardon. 1995. Uptake of soil cadmium by three field crops and its prediction by a pH dependent Freundlich sorption model. Plant Soil 171:263-266.
del Castilho, P., W.J. Chardon, and W. Salomons. 1993. Influence of cattle-manure slurry application on the solubility of cadmium, copper, and zinc in a manured acidic, loamy-sand soil. J. Environ. Qual. 22:689-697. LINK
Houba, V.J.G., W.J. Chardon, and K. Roelse. 1993. Influence of grinding of soil on apparent chemical composition. Commun. Soil Sci. Plant Anal. 24:1591-1602.
van der Molen, J., A.C.M. Beljaars, W.J. Chardon, W.A. Jury, and H.G. van Faassen. 1990. Ammonia volatilization from arable land after application of cattle slurry; 2. Derivation of a transfer model. Neth. J. Agric. Sci. 38:239-254. LINK
van der Molen, J., H.G. van Faassen, M.Y. Leclerc, R. Vriesema, and W.J. Chardon. 1990. Ammonia volatilization from arable land after application of cattle slurry; 1. Field estimates. Neth. J. Agric. Sci. 38:145-158.
van Noordwijk, M., P. de Willigen, P.A.I. Ehlert, and W.J. Chardon. 1990. A simple model of P uptake by crops as a possible basis for P fertilizer recommendations. Neth. J. Agric. Sci. 38:317-332.

Refereed papers, in Dutch

Chardon, W.J., and A.J.P. Smolders. 2021. Organic matter - the sponge in the soil (In Dutch. / Organische stof - de spons in de bodem). Bodem 31(4):xx-xx

Chardon, W.J. 2020. No owner or tenant, employed by Herenboeren (In Dutch. / Geen eigenaar of pachter, in dienst van Herenboeren - Hoe maak je investeringen in bodemverbetering rendabel? Bodem 30(1):22-23.

Fujita, Y., E. Dorland, W.J. Chardon, and A.L. de Jong. 2018. Reusing iron rich drinking water sludge gives oppportunities for nature development (In Dutch. / Hergebruik ijzerrijk drinkwaterslib biedt kansen voor natuurontwikkeling). Vakblad Natuur, Bos en Landschap maart 2018, p. 20-23.

Chardon, W.J., and E. Hagelen. 2018. Trainee: a gradual start to your career (In Dutch. / Trainee: een geleidelijke start van je loopbaan). Bodem 28(5):25-26.

Dorland, E., Y. Fujita, W.J. Chardon, C.H.E.T. Lucassen, A.J.P. Smolders, R. Ketelaar, and A.L. de Jong. 2016. Reusing drinking water sludge aims nature development on phosphorus rich soils (In Dutch. / Hergebruik drinkwaterslib beoogt natuurontwikkeling op fosfaatriijke gronden). Vakblad Natuur, Bos en Landschap april 2016, p. 3-5.

Verberne, J., W.J. Chardon, J.H. Spijker, G. Mol, and T. van Hattum. 2016. De-tiling the garden! Towards climate-proof cities. (In Dutch. / Onttegel de tuin! : Bewustwording over het belang van groene tuinen voor een klimaatbestendige stad). Bodem 26(5):28-30.

Rutgers, M., and W.J. Chardon. 2016. Global Soil Biodiversity Atlas (book review / In Dutch, boekbespreking). Bodem 26(4):27.

Lucassen, C.H.E.T., W.J. Chardon, E. Dorland, M.L. van der Sluys, M.D.M. Poelen, and A.J.P. Smolders. 2015. Iron rich drinking water sludge and reducing phosphorus availability on agricultural soils: Proof of principle. (in Dutch / IJzerrijk drinkwaterslib en verschraling landbouwgronden: een proof of principle). Landschap 2015(4):161-169.

Chardon, W.J., R. de Windt, and R.N.J. Comans. 2015. Portrait of W.C.H. Staring revives - Medaillon and new cast made from grave monument Staring (In Dutch. / Beeltenis van W.C.H. Staring herleeft - Medaillon en nieuw afgietsel gemaakt van grafmonument Staring). Bodem 25(2):8-9.

Rutgers, M. , and W.J. Chardon. 2015. Soil Atlas: Facts and figures about earth, land and fields (book review / In Dutch, boekbespreking). Bodem 25(2):26.

Chardon, W.J., J.E. Groenenberg, S. Jansen, J. Gerritsen, A. Buijert, R. Talens, and A.F. Krol. 2014. Capturing phosphorus from flower bulb fields using iron coated sand - Testing measures that can reduce phosphorus emission (In Dutch / Afvangen van fosfaat uit bloembollensector met ijzerzand - Test van maatregelen die fosforemissie verminderen). Bodem 24(6):20-22.

van Beek, C.L., and W.J. Chardon. 2013. Hot off the press: from science to global commotion (In Dutch. / Vers van de pers: van wetenschap tot wereldwijde commotie). Bodem 23(2):20-23.

Koopmans, G.F., W.J. Chardon, P. Belder, and J.E. Groenenberg. 2011. Removal of phosphorus from soil water with iron coated sand: The enveloped drain (In Dutch / Verwijdering van fosfaat uit bodemwater met ijzerzand: de omhulde drain). H2O 2011(20):35-38.

Chardon, W.J., and A.J.P. Smolders. 2009. Limit values for phosphorus availability with nature recovery (In Dutch. / Grenswaarden voor beschikbaarheid van bodemfosfaat bij natuurontwikkeling). De Levende Natuur 110:95.

Chardon, W.J., F.P. Sival, R.H. Kemmers, S.P.J. van Delft, and G.F. Koopmans. 2009. Is it possible to remove enough phosphorus with vegetative mining instead of top soil removal (In Dutch, with English abstract. / Is het mogelijk om met uitmijnen in plaats van ontgronden voldoende fosfaat kwijt te raken ?). De Levende Natuur 110:39-42.

Sival, F.P., W.J. Chardon, M. van Rooij, and P.J. van der Reest. 2009. Effectiveness of removing the top soil for decreasing the nutrients N and P in nature recovery projects in the province of Zeeland (In Dutch, with English abstract. / Effectiviteit van afgraven voor natuurherstel in Zeeland). De Levende Natuur 110:22-27.

Koopmans, G.F., W.J. Chardon, C. van der Salm, and O. Oenema. 2005. Mining P-rich agricultural soils, a realistic solution? (In Dutch / Uitmijnen van fosfaatrijke landbouwgronden, een realistische oplossing? : grondonderzoek is nodig om de effectiviteit en duur van uitmijnen te voorspellen). Bodem 15(5): 171-174.

Chardon, W.J., and F.P. Sival. 2003. Phosphorus: obstacle for realising the National Ecological Network on former agricultural land? (In Dutch, with English abstract. / Fosfaat: knelpunt voor realisering EHS op voormalige landbouwgronden?). De Levende Natuur 104:267-271.

Eijsackers, H., and W.J. Chardon. 1979. Side effects of ammonium sulfamate on soil fauna. (In Dutch. / Nevenwerkingen van ammoniumsulfamaat op de bodemfauna) Ned. Bosbouw Tijdschrift 51:1-6. link

Contributions to books; theses; websites

W.J. Chardon. 2010. J.M. van Bemmelen (1830-1911). In Canon van de Nederlandse Bodemkunde / Canon of Dutch Soil Science - 3. link
Maguire, R.O., W.J. Chardon, and R.R. Simard. 2005. Assessing potential environmental impacts of soil phosphorus by soil testing. p. 145-180. In J.T. Sims and A.N. Sharpley (ed.) Phosphorus: Agriculture and the environment. Agron. Monogr. 46. ASA, CSSA, and SSSA, Madison, WI.
de Willigen, P., G. Dijksterhuis, and W.J. Chardon. 1998. Dynamics and availability of phosphorus in soils. (In French / Dynamique et disponibilité du phosphore dans les sols.) In: H.Breman & K.Sissoko (eds.). L'intensification agricole au Sahel. Editions Karthala, IER, AB-DLO-DAN-UAW, 1998, p. 265-284.
Chardon, W.J. 1984. Mobility of cadmium in soil (In Dutch / Mobiliteit van cadmium in de bodem.) PhD thesis Agricultural University Wageningen. 200 pp.
Chardon, W.J. 1977. Influence of fertilization on soil fauna in relation to the presence of meadow birds. (In Dutch / De invloed van bemesting op bodemfauna in relatie tot het voorkomen van weidevogels). MSc thesis. Agricultural University Wageningen. Dept. Natuurbehoud en -beheer, LH-Nb 1976/77 nr. 55, 41 pp.
Chardon, W.J. 1977. Influence of ammonium sulfamate on Oniscus asellus and Julidae species. (In Dutch / De invloed van ammoniumsulfamaat op Oniscus asellus en Julidae species). Report of work at RIN Arnhem. Agricultural University Wageningen. Dept. Natuurbehoud en -beheer, 23 pp.

Reports & non-refereed papers

Koopmans, G.F., T. Hiemstra, C. Vaseur, W.J. Chardon, A. Voegelin, and J.E. Groenenberg. 2020. Use of iron oxide nanoparticles for immobilizing phosphorus in-situ: Increase in soil reactive surface area and effect on soluble phosphorus. Sci. Total Environ. 711, https://doi.org/10.1016/j.scitotenv.2019.135220

Dorland, E., Y. Fujita, W.J. Chardon, J.E. Groenenberg, C.H.E.T. Lucassen, A.J.P. Smolders, and A.L. de Jong. 2016. Iron sludge as alternative for removing plough layer. Nature development by phosphorus immobilisation. (In Dutch. / IJzerslib als alternatief voor afgraven – Natuurontwikkeling door fosfaatimmobilisatie. Report KIWA BTO 2015.078, april 2016

Groenenberg, J.E., W.J. Chardon, and P.J.M. Vreeburg. 2015. Reducing the phosphorus load of surface water with a P-binding drain : report of monitoring a field pilot and research on practical implementation of the measure.(in Dutch / Vermindering van de fosfaatbelasting oppervlaktewater met P-bindende drain : rapportage monitoring veldpilot en onderzoek naar praktische inpasbaarheid van de maatregel. Report 2678, Alterra Wageningen.LINK
Buijert, A., R. Talens, W.J. Chardon, J.E. Groenenberg, S. Jansen, and J. Gerritse. 2015. Pilot effect oriented removal of phosphorus in the flower bulb region - Results of field pilot Voorhout and synthesis of various measures (in Dutch / Pilot effectgerichte verwijdering fosfaat bollenstreek - Resultaten veldpilot Voorhout en synthese diverse maatregelen). Report Arcadis 078237075:0.5, for Hoogheemraadschap van Rijnland
Ehlert, P.A.I. and W.J. Chardon. 2014. Changes in the sulfur balance of soils in The Netherlands. (in Dutch / Veranderingen van de zwavelbalans van de Nederlandse bodem). Report 2516, Alterra Wageningen. LINK
Ehlert, P.A.I., and W.J. Chardon & S.L.G.E. Burgers. 2014. Phosphorus status and standards on phosphate use. Significance of the phosphate buffer capacity of the soil: a draft protocol. (in Dutch / Fosfaattoestand en fosfaatgebruiksnorm. Betekenis van het fosfaat-bufferend vermogen van de bodem: ontwerp van een protocol). Report 2500, Alterra Wageningen. LINK
Ehlert, P.A.I., C. van der Salm, S. Burgers, J. van Middelkoop, W. van Dijk, R. van der Maas, A. Pronk, H. van Reuler, G.F. Koopmans, and W.J. Chardon. 2014. Classification for standards on phosphate use within the Dutch Fertilizer Law; agricultural and environmental aspects connected (in Dutch / Fosfaatklassen voor fosfaatgebruiksnormen van de Meststoffenwet. Landbouwkundige en milieuhygiënische aspecten in samenhang). Report 2499, Alterra Wageningen 98 pp. LINK
Chardon, W.J., J.E. Groenenberg, and G.F. Koopmans, 2014. Use of iron sludge for nature development. Report laboratory research. (in Dutch / Gebruik van ijzerslib voor het ontwikkelen van nieuwe natuur. Verslag laboratoriumonderzoek). Report 2414, Alterra Wageningen.
Chardon, W.J., and O. Oenema. 2013. Exploration of possible scarcity of micronutrients in the food system (in Dutch / Verkenning mogelijke schaarste aan micronutriënten in het voedselsysteem). Report 2413, Alterra Wageningen. PDF
Oenema, O., W.J. Chardon, P.A.I. Ehlert, K.C van Dijk, O.F. Schoumans, and W. Rulkens. 2012. Phosphorus fertilisers from by-products and wastes. Proceedings 717, International Fertiliser Society, Leek, UK. 55 pp.
Belder, P., S. de Kool, S. Jansen, R. Stuurman, G.F. Koopmans, and W.J. Chardon. 2011. Effect oriented removal of P from soil and ditch water on dune sand soils. (In Dutch / Effectgerichte aanpak verwijdering P uit bodem- en slootwater duinzandgrond). BloembollenVisie 2 Dec. 2011, p. 20. PDF
Schoumans, O.F., W.J. Chardon, M. Bechmann, C. Gascuel-Odoux, G. Hofman, B. Kronvang, M.I. Litaor, A. Lo Porto, P. Newell-Price, and G.H. Rubaek. 2011. Mitigation options for reducing nutrient emissions from agriculture. A study amongst European member states of Cost action. Report 2141, Alterra Wageningen 144 pp. PDF
Turtola, E., P. Ekholm, and W.J. Chardon (eds.). 2010. Novel methods for reducing agricultural nutrient loading and eutrophication. Abstracts Meeting of Cost 869 14-16 June, Jokioinen, Finland. MTT Science 10, 60 pp.
Koopmans, G.F., W.J. Chardon, and J.E. Groenenberg. 2010. Characterisation of iron sludge and iron coated sand (in Dutch / Karakterisatie van ijzerslib en -zand). Report 2047, Alterra Wageningen. PDF
van Boekel, E.M.P.M., P.J.T. van Bakel, F.J.E. van der Bolt, W.J. Chardon, O.A. Clevering, W. van Dijk, I.E. Hoving, G.J. Noij, and E.A. van Os. 2009. Ex-ante evaluation agriculture and KRW : background study on effects of supplementary measures (in Dutch / Ex-ante evaluatie landbouw en KRW : achtergrondstudie; effecten van aanvullende maatregelen.) Report 1987, Alterra Wageningen. PDF
Noij, I.G.A.M., J. van der Spek, H.Th.L. Massop, E.M.P.M. van Boekel, C. Schuiling, M. Pleijter, O. Clevering, P.J.T. van Bakel, W.J. Chardon, and D.J.J. Walvoort. 2009. Policy framework on phosphorus for North- and Middle Limburg. Scientific underpinning (in Dutch / Beleidskader fosfaat voor Noord- en Midden-Limburg. Wetenschappelijke onderbouwing.). Report 1894, Alterra Wageningen. PDF
Chardon, W.J. 2009. Possibilities for immobilizing soil phosphate for nature development. (In Dutch / Mogelijkheden voor immobiliseren van bodemfosfaat in het kader van natuurontwikkeling). Report 1870, Alterra Wageningen. PDF
Chardon, W.J., H. Heesmans, and P.J. Kuikman, 2009. Trends in carbon stocks in Dutch soils: datasets and modeling results. Report 1869, Alterra Wageningen. PDF
Koopmans, G.F., W.J. Chardon, I. Lubbers, J. Oenema, A. van den Toorn, and C. van der Salm. 2009. Diffuse loading of surface water with nutrients from grassland on a heavy clay soil. Monitoring of nutrient emission and speciation on a dairy farm near Waardenburg. (in Dutch / Diffuse belasting van het oppervlaktewater met nutriënten vanuit grasland op een zware kleigrond. Monitoring van nutriëntenemissies en -verschijningsvormen op een melkveehouderij bij Waardenburg). Report 1738, Alterra Wageningen. PDF.
Chardon, W.J. 2009. Phosphorus extraction with iron oxide-impregnated filter paper (Pi test). In: J.L. Kovar and G.M. Pierzynski (ed.) Methods of phosphorus analysis for soils, sediments, residuals, and waters. Second Ed. Southern Coop. Ser. Bull. 408, USA, p. 25-28. PDF
Kuikman, P.J., P.A.I. Ehlert, W.J. Chardon, C.L. van Beek, G. Tóth, and O. Oenema. 2008. Current status of risk assessment methodologies for soil organic matter decline in Europe. Report Alterra, Wageningen, The Netherlands. PDF
Chardon, W.J. 2008. Phosphorus immobilizing amendments to soil. Factsheet COST 869, PDF.
Chardon, W.J. 2008. Vegetative mining. Factsheet COST 869, PDF.
Chardon, W.J., N. Reijers, and A.M. van Dam. 2008. Possibilities of applying phosphate filters in bulb growing. (In Dutch / Mogelijkheden voor toepassing van fosfaatfilters in de bloembollenteelt.) Report 1714, Alterra Wageningen. PDF
de Willigen, P., B.H. Janssen, H.I.M. Heesmans, J.G. Conijn, G.J. Velthof, and W.J. Chardon. 2008. Decomposition and accumulation of organic matter in soil. Comparison of some models. Report 1726, Alterra Wageningen. PDF
Chardon, W.J. 2008. Mining or topsoil removal of former agricultural soils for nature development. A study within the framework of 'Soil services'. (In Dutch / Uitmijnen of afgraven van voormalige landbouwgronden ten behoeve van natuurontwikkeling. Een studie in het kader van "Bodemdiensten"). Report 1683, Alterra Wageningen. PDF
Chardon, W.J., G. Mol, C. van der Salm, and F.P. Sival. 2007. Sorption of orthophosphate in peat soils and calcareous sandy soils and the importance of organically bound phosphorus. Knowledge gaps with respect to sorption and leaching of phosphorus. (In Dutch / De sorptie van orthofosfaat in veengronden en kalkrijke zandgronden en het belang van organisch gebonden fosfaat. Kennislacunes met betrekking tot vastlegging en uitspoeling van fosfaat.) Report 1480, Alterra Wageningen. PDF
Chardon, W.J., M. Pleijter, C. van der Salm, O.F. Schoumans, and O. Oenema. 2007. Environmental effect of tightening up and differentiating of limits on phosphorus use in agriculture. (In Dutch / Milieukundige gevolgen van aanscherping en differentiatie van fosfaatgebruiksnormen in de landbouw.) Report 1571, Alterra Wageningen. PDF
Sival, F.P., W.J. Chardon, and M. van Rooij. 2007. Phosphate and nature development on former agricultural soils in de province Zeeland. (In Dutch / Fosfaat en natuurontwikkeling op voormalige landbouwgronden in de provincie Zeeland.) Report 1495, Alterra Wageningen. PDF
Noij, I.G.A.M., P.J.T. van Bakel, R.A. Smidt, H.T.L. Massop, and W.J. Chardon. 2006. Pilot project on phosphorus in North and middle Limburg; approach and monitoring. (In Dutch / Fosfaatpilot Noord- en Midden-Limburg; plan van aanpak en monitoring.) Report 1255, Alterra Wageningen. 127 p. PDF
Chardon, W.J. 2006. Possibilities to reach the nitrate standard. (In Dutch / Mogelijkheden om de nitraatnorm te halen.) p. 29-37. In H.F.M. ten Berge (ed.) Enkele afrondende notities uit Sturen op Nitraat. Report 113, Plant Research International Wageningen.
van Delft, S.P.J., W.J.M. de Groot, and W.J. Chardon. 2006. Sampling of agricultural soils and determination of availability of P in relation to intended nature development. Characterization of 7 terrains in the province of Limburg. (In Dutch / Bemonstering landbouwgronden en bepaling van de beschikbaarheid van fosfaat in verband met voorgenomen natuurontwikkeling. Karakterisering van 7 terreinen in de provincie Limburg.) Report 1332, Alterra Wageningen. PDF
Chardon, W.J. , F.P. Sival, and G.F. Koopmans. 2005. Phosphorus as a snake in the grass: remove the soil or mine it? (In Dutch / Fosfaat als adder onder het gras: afgraven of uitmijnen?.) H2O 19 (2005) p. 44.
Koopmans, G.F., W.J. Chardon, C. van der Salm, and O. Oenema. 2005. Mining of phosphorus rich agricultural soils: a realistic approach? Soil research is needed for predicting the effectiveness and duration of mining. (In Dutch / Uitmijnen van fosfaatrijke landbouwgronden: een realistische oplossing? Grondonderzoek is nodig om de effectiviteit en duur van uitmijnen te voorspellen.) Bodem 2005 (5), 171-174
Hoving, I.E., H. Everts, and W.J. Chardon. 2005. Sampling and analysis of mineral nitrogen in soil and nitrate in groundwater (in Dutch / Monstername en analyse van N-mineraal in de bodem en nitraat in het grondwater). Praktijkrapport Rundvee 65. Praktijkonderzoek Animal Sciences Group Wageningen UR, Lelystad, the Netherlands. 38 pp.
Schoumans, O.F., P.A.I. Ehlert, and W.J. Chardon. 2005. Possibilities for answering policy questions regarding phosphorus loss limits (in Dutch / Mogelijkheden tot de beantwoording van beleidsvragen inzake aanpassing van fosfaatverliesnormen). Report Alterra Wageningen, 1181. PDF
Sival, F.P., and W.J. Chardon. 2004. Nature development on phosphorus saturated soils: phosphorus depletion by crops (in Dutch / Natuurontwikkeling op fosfaatverzadigde gronden: fosfaatonttrekking door een gewas). Report 1090, Alterra, Wageningen. PDF
Chardon, W.J., and G.F. Koopmans (ed.). 2004. Critical evaluation of options for reducing phosphorus loss from agriculture. IPW4 - Proc. of the 4th Int. Phosphorus Workshop, 16th - 19th August 2004, Wageningen, The Netherlands.
Koopmans, G.F., W.J. Chardon, O. Oenema, and W.H. van Riemsdijk. 2004. Mining opens perspective for decreasing the risk of phosphorus leaching from over-fertilized agricultural soils. (In Dutch / Uitmijnen biedt perspectief om uitspoeling van fosfaat uit zwaar bemeste landbouwgronden te verminderen.) H2O 37 (12), 15-18.
van Middelkoop, J.C., C. van der Salm, D.J. den Boer, M. ter Horst, W.J. Chardon, R.F. Bakker, R.L.M. Schils, P.A.I. Ehlert, and O.F. Schoumans. 2004. Effects of phosphorus and nitrogen surpluses on grassland. (In Dutch / Effecten van fosfaat- en stikstofoverschotten op grasland.) Praktijkrapport Rundvee 48. Praktijkonderzoek Animal Sciences Group WUR.
Koopmans, G.F., and W.J. Chardon. 2004. Mining opens perspective for decreasing the risk of leaching from over-fertilized agricultural soils. (In Dutch / Uitmijnen biedt perspectief om het risico van uitspoeling uit zwaar bemeste landbouwgronden te verminderen.) Information brochure 398.49, Research Program on manure and minerals.
Sival, F.P., W.J. Chardon, and M.M. van der Werff. 2004. Nature development on former agricultural soils in relation to phosphorus availability: evaluation of depletion measures (in Dutch / Natuurontwikkeling op voormalige landbouwgronden in relatie tot de beschikbaarheid van fosfaat: evaluatie van verschralingsmaatregelen). Report 951, Alterra, Wageningen. PDF
Schoumans, O.F., P.A.I. Ehlert, and W.J. Chardon. 2004. Evaluation of methods for characterising soils that are considered for supplemental fertilization (in Dutch / Evaluatie van methoden voor het karakteriseren van gronden die in aanmerking komen voor reparatiebemesting). Report Alterra Wageningen, 730.3., PDF
Smit, A., M.J.D. Hack-ten Broeke, H.F.M. ten Berge, S.L.G.E. Burgers, W.J. Chardon, P.L.A. van Enckevort, J.J. de Gruijter, I.E. Hoving, and G.L. Velthof. 2003. Data collection Sturen op nitraat; looking for an indicator (in Dutch). Report Alterra Wageningen, 658 / Reeks Sturen op Nitraat 3.
Chardon, W.J., and P.J.A. Withers. 2003. Introduction to papers from the EU COST Action 832 "Quantifying the agricultural contribution to eutrophication". J. Plant Nutr. Soil Sci. 166:401.
Chardon, W.J. 2003. Development of an indicator for phosphorus. (In Dutch / Development of an indicator for phosphorus.) Information brochure 398.26, Research Program on manure and minerals.
Koopmans, G.F., O.F. Schoumans, and W.J. Chardon. 2003. The use of indicators for the identification of phosphorus transfer from agricultural land to surface waters. Report 793. Alterra, Wageningen.
Sival, F.P., and W.J. Chardon. 2003. Phosphorus: key factor for nature development on former agricultural soils? (In Dutch / Fosfaat: sleutelfactor bij natuurontwikkeling op voormalige landbouwgronden?). Vakblad Natuurbeheer 2003 (1):10-11.
Chardon, W.J., and O.F. Schoumans (eds.). 2002. Phosphorus losses from agricultural soils: Processes at the field scale. COST action 832. Alterra Wageningen, The Netherlands. 137 pp.
Chardon, W.J., and O.F. Schoumans. 2002. Solubilization of phosphorus: Concepts and process description of chemical mechanisms. In: W.J.Chardon and O.F.Schoumans (ed.) Phosphorus losses from agricultural soils: Processes at the field scale. COST action 832. Alterra Wageningen, The Netherlands. p. 44-52.
Schoumans, O.F., and W.J. Chardon. 2002. Models describing phosphorus losses by subsurface transport used in Europe. In: W.J.Chardon and O.F.Schoumans (ed.) Phosphorus losses from agricultural soils: Processes at the field scale. COST action 832. Alterra Wageningen, The Netherlands. p. 102-110.
Chardon, W.J, and K.W. van der Hoek. 2002. Calculation scheme for the emission of fine dust from agriculture. (In Dutch / Berekeningsmethode voor de emissie van fijn stof vanuit de landbouw.) Report 682, Alterra, Wageningen.
Sival, F.P., and W.J. Chardon. 2002. Nature development on former agricultural soils in relation to phosphorus availability. (In Dutch / Natuurontwikkeling op voormalige landbouwgronden in relatie tot de beschikbaarheid van fosfaat.) Report SV 511, SKB, Gouda.
Roest, C.W.J., R.P.J.J. Rietra, J.S. van der Molen, W.J. Chardon, A.A.M.F.R. Smit, and R.C.M. Merkelbach. 2002. Preparatory study for further research on possible effects of water conservation on soil and surface water quality. (In Dutch / Definitiestudie voor vervolgonderzoek naar mogelijke effecten van waterconservering op grond- en oppervlaktewaterkwaliteit.) Alterra report Water conservation, 70 pp.
den Boer, D.J., J.C. van Middelkoop, and W.J. Chardon. 2001. Phosphorus status and leaching as a function of soil use and soil fertility. (In Dutch / Fosfaattoestand en -uitspoeling in afhankelijkheid van gebruik en bodemvruchtbaarheid.) Report 364.97, Nutrient Management Institute, Wageningen, The Netherlands.
Chardon, W.J. 2000. The role of the soil in phosphorus cycling. In: B.P.Weidema & M.J.G.Meeusen (ed.) Agricultural data for Life Cycle Assessments. Report 2.00.01, LEI, The Hague, The Netherlands. Chapter 15, Vol. 2, p. 8-12.
Chardon, W.J. 2000. Phosphorus extraction with iron oxide-impregnated filter paper (Pi test). In: G.M. Pierzynski (ed.) Methods of phosphorus analysis for soils, sediments, residuals, and waters. Southern Coop. Ser. Bull. 396, USA, p. 27-30.
Schoumans, O.F., C. van der Salm, P.A.I. Ehlert, and W.J. Chardon. 2000. Processes on field level: phosphorus. (In Dutch / Processen op perceelsniveau: P.) In: J.J.Schröder en W.J.Corré (eds.) Actualisering stikstof- en fosfaat- desk-studies Plant Res. Int. Wageningen, report 22, p. 76-93.
Chardon, W.J. 1999. Emission of fine dust from agriculture. (In Dutch / Emissies van fijn stof in de landbouw.) Report AB-DLO, Wageningen, nr. 105 26 pp.
Chardon, W.J., and H.G. van Faassen. 1999. Soil indicators for critical source areas of phosphorus leaching. The Dutch Integrated Soil Research Programme, Report no. 22, Wageningen. PDF
Chardon, W.J., and P. de Willigen. 1999. Modelling phosphorus sorption and desorption from spherical aggregates. In: Modelling P uptake, a link between soil chemistry and plant growth. Proc. AB-DLO - INRA Bordeaux meeting, 18 & 19 Nov. 1999 Wageningen.
Koopmans, G.F., W.J. Chardon, P.A.I. Ehlert, P. de Willigen, and O. Oenema. 1999. Depletion of an over-fertilized soil in a pot experiment. In: Modelling P uptake, a link between soil chemistry and plant growth. Proc. AB-DLO - INRA Bordeaux meeting, 18 & 19 Nov. 1999 Wageningen.
Oenema, O., W.J. Chardon, and P.A.I. Ehlert. 1999. Nutrient management strategies across European agriculture. Proc. Annual Meeting Northeastern Branch of the ASA & SSSA and Eastern Canada Nutrient Management Workshop, July 1999, p. 4-13.
Chardon, W.J., and P. de Willigen. 1998. Modelling phosphorus desorption from spherical aggregates. In: R.H. Foy and R. Dils (ed.), Practical and innovative measures for the control of agricultural phosphorus losses to water. Proc. OECD Workshop June 1998, Antrim, N. Ireland. p. 42-43.
Koopmans, G.F., W.J. Chardon, J. Bril, P.C. de Ruiter, and J. Dolfing. 1998. Applicability of immobilizing agents for the remediation of heavy metal polluted soils in the Netherlands. Wageningen, The Dutch Integrated Soil Research Programme, Report no. 17. 18 pp.
Withers, P.J.A., and W.J. Chardon. 1998. Cost 832 'Quantifying the agricultural contribution to eutrophication'. In: R.H. Foy and R. Dils (ed.), Practical and innovative measures for the control of agricultural phosphorus losses to water. Proc. OECD Workshop June 1998, Antrim, N. Ireland. p. 46-47.
Chardon, W.J. 1997. Organically combined phosphorus in soil solutions and leachate. In: H. Tunney, O.T. Carton, P.C. Brookes and A.E. Johnston (eds). Phosphorus loss from soil to water. CAB International 1997, pp. 363-366.
del Castilho, P., J. Bril, W.J. Chardon, P.F.A.M. Römkens, and O. Oenema. 1996. Effect of changes in soil factors on soil solution cadmium; sampling and phyto-availability aspects. Workshop Zagreb.
Chardon, W.J., and O. Oenema. 1996. Survey of possibilities for management and recovery of phosphorus leaking soils. (In Dutch / Verkenning van de mogelijkheden voor beheer en herstel van fosfaatlekkende landbouwgronden.) Abstracts National Symposium on Soil Research, Lunteren 20, 21-11-1996, PGBO Wageningen, pp. 58-60.
Chardon, W.J., and O. Oenema. 1996. Leaching of dissolved organically bound phosphorus. Yearly report AB-DLO Haren/Wageningen, 1995, pp. 39-42.
Chardon, W.J., O. Oenema, O.F. Schoumans, P.C.M. Boers, B. Fraters, and Y.C.W.M. Geelen. 1996. Survey of possibilities for management and recovery of phosphorus leaking soils. (In Dutch / Verkenning van de mogelijkheden voor beheer en herstel van fosfaatlekkende landbouwgronden.) Dutch Integrated Soil Research Program, Report no. 8, Wageningen.
Oomes, M.J.M., W.J. Chardon, and F.H.H. Jacobs. 1996. Extensive management of grassland, impact on conservation of biological resources and farm output. 4. Impact of groundwater quantity and quality on macro-nutrient availability. In: Final report EU-project AIR-CT92-0079, 24 pp.
Chardon, W.J. 1995. Phosphorus species in animal manure and their effectiveness. A literature review. (In Dutch / Fosfaatvormen in dierlijke mest en hun effectiviteit. Verslag van een literatuuronderzoek.) Report 53. Inst. voor Agrobiol. en Bodemvruchtbaarheidsond., 33 pp.
Ehlert, P.A.I., J. Alblas, D.J. den Boer, W.J. Chardon, and J.F.M. Huijsmans. 1995. Phosphorus availability of animal manures (In Dutch / Fosfaatwerking van dierlijke meststoffen. Evaluatie van het FOMA-project 3.49.) Evaluation of the FOMA-project 3.49. Report Inst. voor Agrobiol. en Bodemvruchtbaarheidsond. no. 27.
Chardon, W.J. 1994. Relationship between phosphorus availability and phosphorus saturation index. Report 19, Inst. voor Agrobiol. en Bodemvruchtbaarheidsond., Haren. PDF
Houba, V.J.G., W.J. Chardon, and K. Roelse. 1993. Influence of grinding of soil on apparent chemical composition. Nota 263. Inst. Soil Fert. Res. Haren Netherlands, 42 pp.
Chardon, W.J., J. van der Molen, and H.G. van Faassen. 1990. Modelling ammonia emissions from arable land. In: V.C.Nielsen et al. (eds), Odour and ammonia emissions from livestock farming. Elsevier 1991, p. 156-165.
Faassen, H.G. van, W.J. Chardon, J. Bril, and R. Vriesema. 1990. Ammonia volatilization from arable land after surface application or incorporation of dairy cattle slurry. Final report project 132. Inst. for Soil Fertility Research Haren, nr. 236.
Salomons, W., J. Bril, J. Japenga, W.J. Chardon, P. del Castilho, J. Dalenberg, S.D. Scheltens, and W. Schuurmans. 1990. Animal manure: an integrated approach of the chemical processes (In Dutch / Dierlijke mest: naar een integrale benadering van de processen.) In: Proc. Symposium Utrecht 13/14-6-1990. KNCV Symposia-reeks nr. 1, 477 p. KNCV Den Haag, pp. 19-31.
Chardon, W.J. 1987. Soil chemical aspects of animal manure. (In Dutch / Bodemchemische aspecten van dierlijke mest.) Report Inst. voor Bodemvruchtbaarheid Haren, 18 pp.
Chardon, G.M., W.J. Chardon, and L.J.E. Duijsens. 1985. Inventory of regions in The Netherlands where negative effects of acid rain can be expected on the short term. Staatsuitgeverij ?s Gravenhage (In Dutch. / Inventarisatie van gebieden in Nederland waar op korte termijn zeer nadelige effecten van zure regen te verwachten zijn,) Bodembeschermingsreeks no. 50 76 pp.
Chardon, W.J., and H.N. Kerdijk. 1984. Balance studies; Chapter. 4 In : Origin and transport of contaminants on the North Sea. (In Dutch / Balansstudies.) Report S598/S599, Waterloopkundig Laboratorium Delft, pp. 50-85.

Abstracts, posters, etc.

Jansen, S., J. Gerritse, R. Stuurman, W.J. Chardon, and R. Talens, 2016. Robust options to remove nitrate and phosphate from tile drainage. Proc. 10th Intern. Drainage Symposium, ASABE Meeting Presentation Paper nr 162514798. DOI:10.13031/ids.20162514798

Chardon, W.J. , J.E. Groenenberg, and G.F. Koopmans, 2013. Immobilizing soil phosphorus for nature development. Poster presented during the 7th International Phosphorus Workshop IPW7, Uppsala, Sweden, 9 - 13 September 2013.

Koopmans, G.F., W.J. Chardon, and J.E. Groenenberg. 2012. Removal of phosphorus from drainage water using an enveloped pipe drain. EuroSoil, July 2-6, 2012, Bari, Italy. Symposium “Speciation and Losses of Phosphorus and Metals from Soils and Mitigation Measures” by S. de Bolle, G.F. Koopmans, W.J. Chardon, E. Smolders, and W.H. van Riemsdijk

Chardon, W.J., M. Pleijter, and G.F. Koopmans. 2011. Removal of nitrate from drainage water using woodchips. Poster. Final meeting COST 869, Keszthely, Hungary, October 12-14, 2011.

Chardon, W.J., P. Belder, J.E. Groenenberg, and G.F. Koopmans. 2011. Removal of phosphorus from drainage water using an enveloped tile drain. Poster. Final meeting COST 869, Keszthely, Hungary, October 12-14, 2011.

Chardon, W.J., M. Pleijter, and G. Koopmans. 2010. Use of organic material for removing nitrate from drainage water (In Dutch / Gebruik van organisch materiaal voor de verwijdering van nitraat uit drainagewater). Information sheet innovation program KRW, Alterra, Wageningen.

Koopmans, G.F., and W.J. Chardon. 2010. Use of filters to prevent nutrient losses (In Dutch / Gebruik van filtersystemen om nutriëntenverliezen te voorkomen). Poster. Themadag Landbouw & Kaderrichtlijn Water, 21 januari 2010, Utrecht and Open dag van PPO Business unit Bloembollen, Boomkwekerij & Fruit voor bloembollentelers, 28 mei 2010, Lisse.

Pleijter, M., W.J. Chardon, and G.F. Koopmans. 2010. Removal of nitrate from drainage water using woodchips (In Dutch / Verwijderen nitraat uit drainwater met houtsnippers). Poster, Alterra, Wageningen.

van der Salm, C., W.J. Chardon, and G.F. Koopmans. 2010. Phosphorus and nitrogen losses from a grassland site on a heavy clay soil in a fluvial plain in the Netherlands. Geophysical Research Abstracts Vol. 12, EGU2010-5145, EGU General Assembly 2010.

Chardon, W.J., and G.F. Koopmans. 2010. Testing phosphorus sorbing materials - Results and questions about criteria. Abstract Workshop "Novel methods for reducing agricultural nutrient loading and eutrophication", meeting of Cost 869, 14-16 June Jokioinen, Finland. p. 14

Chardon, W.J., P. Jordan, B.F. Kronvang, and O.F. Schoumans. 2010. Mitigation options implementation: from science to agricultural policy. Abstract IPW6 Workshop, Seville, Spain. 27 Sept. - 1 Oct. 2010.

Schoumans, O.F., W.J. Chardon, M.E. Bechmann, C. Gascuel-Odoux, G. Hofman, M.I. Litaor, A. Lo Porto, B. Kronvang, G.H. Rubaek, and B. Ulén. 2010. Overview of mitigation options to reduce nutrient losses from rural areas and to improve surface water quality. Abstract IWA World Water Congress, Montr‚al, Canada. 19-24 Sept. 2010, 2 pp.

Koopmans, G.F., W.J. Chardon, and J.E. Groenenberg. 2010. Use of reactive materials to bind phosphorus. In Annual Meeting Abstracts [CD-ROM] ASA, CSSA, SSSA, Madison, WI USA Long Beach, CA, October 31 - November 4, 2010.

Buda, A., G.F. Koopmans, W.J. Chardon, and R.B. Bryant. 2010. Emerging technologies to remove nonpoint phosphorus sources from surface water and groundwater. In Annual Meeting Abstracts [CD-ROM] ASA, CSSA, SSSA, Madison, WI USA Long Beach, CA, October 31 - November 4, 2010.

Tóth, G., P.J. Kuikman, P.A.I. Ehlert, W.J. Chardon, C.L. van Beek. 2008. Current status of risk assessment methodologies for soil organic matter decline in Europe. Abstract lecture final RAMSOIL Meeting, 26-01-2009, Brussels. PDF
Chardon, W.J., and O.F. Schoumans. 2008. Overview of potential European measures for agriculture under WFD, collected within COST Action 869: Mitigation options for nutrient reduction in surface water and groundwaters. In: H. Tunney and O. Fenton (eds.) Proc. TEAGASC Grassland and EU Water Framework Conf. Wexford, 12-14 November 2008, p. 23.
van der Salm, C., W.J. Chardon, G.F. Koopmans, J.C. van Middelkoop, and P.A.I. Ehlert. 2008. Phytoextraction of phosphorus-enriched grassland soils. In: Y.M. Luo et al. (eds.), Proc. of SoilRem 2008, October 18-21, 2008, Nanjing, China. p. 165-166.
Chardon, W.J. 2007. Outcome of the inventory among COST partners regarding potential effective mitigation options in the EU. In: W.J. Chardon and O.F. Schoumans (eds.) Abstracts of the workshop Mitigation options: framework, effectiveness, and interactions. 27th - 29th November 2007. North Wyke, Devon, UK. http://www.cost869.alterra.nl/Devon/Devon_abstracts.pdf. p. 26.
Koopmans, G.F., W.D.C. Schenkeveld, J. Song, Y. Luo, W.J. Chardon, J. Japenga, and E.J.M. Temminghoff. 2007. Influence of EDDS on metal speciation in soil extracts: Measurement and mechanistic multicomponent modeling. In Annual Meeting Abstracts [CD-ROM], New Orleans, LA, November 4-8, 2007. ASA, CSSA, SSSA, Madison, WI, USA.
van der Salm, C., W.J. Chardon, and G.F. Koopmans. 2007. Mining soil phosphorous by zero P application: an effective method to reduce P loading to surface water? In: W.J. Chardon and O.F. Schoumans (eds.) Abstracts of the workshop Mitigation options: framework, effectiveness, and interactions. 27th - 29th November 2007. North Wyke, Devon, UK. http://www.cost869.alterra.nl/Devon/Devon_abstracts.pdf. p. 39.
Noij, I.G.A.M., P.J. van Bakel, W.J. Chardon, O. Clevering, W. Corr‚, W. van Dijk, W. de Groot, H.T.L. Massop, J. van Middelkoop, R.A. Smidt, H. Stevens, and A. van den Toorn. 2007. Site specific measures to mitigate P-loads in the Dutch Province of Limburg. In: G. Heckrath, G.H. Rubaek and B. Kronvang (ed.) Diffuse Phosphorus Loss. Proc. 5th Intern. Phosphorus Workshop. 3-7 Sept 2007, Silkeborg, Denmark. DJF Plant Science 130. p. 299-302.
van der Salm, C., W.J. Chardon, and G.F. Koopmans. 2007. Mining soil phosphorus by zero P application; An effective method to reduce the risk of P loading to surface water. In: idem. p. 119-121.
Chardon, W.J., L. Heathwaite, B. Kronvang, S. Rekolainen, and O.F. Schoumans. 2007. COST Action 869 - Mitigation options for nutrient reduction in surface water and groundwaters. In: idem p. 425-427.
Sival, F.P., and W.J. Chardon. 2005. Phosphate as a key factor for nature restoration on former agricultural land? p. 142. In Abstracts of The World Conference on Ecological Restoration. Sept. 2005, Zaragoza, Spain.
Koopmans, G.F., W.J. Chardon, P.F.A.M. Römkens, and O.F. Schoumans. 2004. Phytoremediation as instrument for realising water quality targets: fact or fiction? Abstract lecture Symposium report Bodembreed, 1-2 dec. 2004, p. 25-26.
Chardon, W.J., and G.F. Koopmans. 2004. Phosphorus accumulation in Dutch soils: History, policies and options. p. 10. In W.J. Chardon and G.F. Koopmans (ed). IPW4 - Proceedings of the 4th Int. Phosphorus Workshop, 16th - 19th August 2004, Wageningen, The Netherlands.
van der Zee, S.E.A.T.M., W.J. Chardon, G.F. Koopmans, and O.F. Schoumans. 2004. An indicator for phosphate saturation of soils. p. 44. In W.J. Chardon and G.F. Koopmans (ed). IPW4 - Proceedings of the 4th Int. Phosphorus Workshop, 16th - 19th August 2004, Wageningen, The Netherlands.
Koopmans, G.F., W.J. Chardon, and W.H. van Riemsdijk. 2004. Phosphorus desorption dynamics in soil and the link to a dynamic concept of bioavailability. p. 61. In W.J. Chardon and G.F. Koopmans (ed). IPW4 - Proceedings of the 4th Int. Phosphorus Workshop, 16th - 19th August 2004, Wageningen, The Netherlands.
Sival, F.P., and W.J. Chardon. 2004. Phosphate, a key factor for nature restoration on former agricultural land? p. 68 In W.J. Chardon and G.F. Koopmans (ed). IPW4 - Proceedings of the 4th Int. Phosphorus Workshop, 16th - 19th August 2004, Wageningen, The Netherlands.
Koopmans, G.F., W.J. Chardon, P.A.I. Ehlert, J. Dolfing, R.A.A. Suurs, O. Oenema, and W.H. van Riemsdijk. 2003. Availability of phosphorus for plant uptake in a noncalcareous sandy soil treated with animal manure: determination of an equilibrium desorption isotherm. In Annual Meeting Abstracts [CD-ROM] ASA, CSSA, SSSA, Madison, WI USA.
Schoumans, O.F., W.J. Chardon, P.A.I. Ehlert, and J.P. Destain. 2003. Sources and mobilisation of agricultural phosphorus. In: Quantifying the agricultural contribution to eutrophication; COST 832 Abstracts final meeting, Cambridge (UK), July 31 - August 2, 2003.
Koopmans, G.F., R.W. McDowell, W.J. Chardon, and P. van der Meer. 2003. Using liquid state 31P NMR to characterize mobile organic phosphorus compounds in intensively managed agricultural soils. Poster abstract, Workshop Ascona, Switzerland July 2003.
Sival, F.P., and W.J. Chardon. 2002. Phosphate, a key factor for nature restoration on former agricultural land? Poster presented at 3rd European Conf. on Restoration Ecology, Budapest, August 2002, Abstract p. 180-181.
Chardon, W.J., G.F. Koopmans, and P. de Willigen. 2002. Modeling change in P forms caused by phytoremediation of a P rich sandy soil. In Annual Meeting Abstracts [CD-ROM] ASA, CSSA, SSSA, Madison, WI USA.
Koopmans, G.F., R.A.A. Suurs, P.A.I. Ehlert, W.J. Chardon, and O. Oenema. 2001. Reducing phosphorus leaching from agricultural soils by phytoremediation. Abstract Int. Phosphorus Transfer Workshop, Plymouth, Devon, UK. August 2001. p. 43.
Koopmans, G.F., and W.J. Chardon. 2001. Using 31P-NMR to characterize P forms in manure amended sandy soils. In Annual Meeting Abstracts [CD-ROM] ASA, CSSA, SSSA, Madison, WI USA.
Koopmans, G.F., R.A.A. Suurs, P.A.I. Ehlert, W.J. Chardon, and O. Oenema. 2001. Reducing phosphorus leaching from agricultural soils by phytoremediation. Abstract Int. Phosphorus Transfer Workshop, Plymouth, Devon, UK. August 2001, p. 43.
Chardon, W.J., G.F. Koopmans, and P. de Willigen. 2001. Modeling change in P forms caused by phytoremediation of a P rich sandy soil. Annual Meeting Abstracts ASA, CSSA, SSSA, Wisconsin USA.
Koopmans, G.F., and W.J. Chardon. 2001. Using 31P-NMR to characterize P forms in manure amended sandy soils. Annual Meeting Abstracts ASA, CSSA, SSSA, Wisconsin USA.
Chardon, W.J., O.F. Schoumans, and G.F. Koopmans. 2000. Soil phosphorus saturation index: background, applications, and limitations. Annual Meeting Abstracts ASA, CSSA, SSSA, Wisconsin USA. p. 321.
Koopmans, G.F., R.A. Suurs, W.J. Chardon, P.A.I. Ehlert, and O. Oenema. 2000. Depletion of soil phosphorus in a pot experiment. Annual Meeting Abstracts ASA, CSSA, SSSA, Wisconsin USA. p. 393.
Koopmans, G.F., M.E. van der Zeeuw, W.J. Chardon, and J. Dolfing. 2000. Evaluation of extraction methods as risk indicator for phosphorus leaching. Annual Meeting Abstracts ASA, CSSA, SSSA, Wisconsin USA. p. 320.
Chardon, W.J., and G.F. Koopmans. 1999. Immobilization of phosphorus in excessively fertilized soils. Annual Meeting Abstracts ASA, CSSA, SSSA, Wisconsin USA. p. 337.
Koopmans, G.F., W.J. Chardon, and O. Oenema. 1999. Evaluation of iron oxide impregnated paper (Pi-test) in P-desorption studies. Annual Meeting Abstracts ASA, CSSA, SSSA, Wisconsin USA. p. 337.
Koopmans, G.F., M.E. van der Zeeuw, W.J. Chardon, and O. Oenema. 1999. Evaluation of indicators for assessing phosphorus leaching from P-enriched soils. Annual Meeting Abstracts ASA, CSSA, SSSA, Wisconsin USA. p. 337.
Chardon, W.J., and H.G. van Faassen. 1998. Phosphorus leaking soils. In: Bodembreed, Samenv. Nat. Symp. Bodemonderzoek, Lunteren 1998. p. 131.
Chardon, W.J., and P. de Willigen. 1997. Modelling phosphorus sorption and desorption from spherical aggregates. Wisconsin USA, Agronomy Abstracts, American Society Agronomy, p. 185-186.
Chardon, W.J., and O. Oenema. 1996. Management options for reducing leaching of phosphorus from P enriched soils. Wisconsin USA, Agronomy Abstracts, American Society Agronomy, p. 34.
Chardon, W.J. 1995. Organically combined phosphorus in soil solutions and leachates. Wisconsin USA, Agronomy Abstracts, American Society Agronomy, p. 221.
Chardon, W.J., and D. Blaauw. 1994. Kinetic Freundlich equation: effect of previous additions. Wisconsin USA, Agronomy Abstracts, American Society Agronomy, p. 263.
del Castilho, P., and W.J. Chardon. 1993. Effect of pH on cadmium uptake by some field crops. Proc. Int. Conf. Heavy metals in the environment; Toronto Sept. 1993.
Chardon, W.J. 1993. Characterization of sorbed phosphate using dissolution kinetics. Wisconsin USA, Agronomy Abstracts, American Society Agronomy, p. 224.
Chardon, W.J., J. van der Molen, and H.G. van Faassen. 1990. Modelling ammonia emission from arable land. Wisconsin USA, Agronomy Abstracts, American Society Agronomy, p. 225.