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Leen Janmaat

Leen Janmaat BSc

Senior advisor

T: +31(0)343 523870

 

Publication(s) by Janmaat
Articles in scientific journals (2)
Brochures, books & reports (17)
Specialist journal articles, leaflets, newsletters, etc (68)

Scientific publications

Understanding obstacles and opportunities for successful market introduction of crop varieties with resistance against major diseases.
Nuijten, E., J. de Wit, L. Janmaat, A. Schmitt, L. Tamm and E.T. Lammerts van Bueren. 2017. Understanding obstacles and opportunities for successful market introduction of crop varieties with resistance against major diseases. Organic Agriculture (first online).
DOI: 10.1007/s13165-017-0192-8
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Innovative Intercropping System to Improve Soil Health in Organic Greenhouse Cultivation
Cuijpers, W.J.M., A.W.G. van der Wurff and L. Janmaat. 2011. Innovative Intercropping System to Improve Soil Health in Organic Greenhouse Cultivation. Acta Horticulturae. 915:125-132.
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Brochures, books & reports


Bijenvolken als onderdeel van het landbouwbedrijf
Luske, B. and L. Janmaat. 2016. Honeybees as a component on farms: How farmers and citizens can contribute to a flourishing countryside. (In Dutch.). Louis Bolk Instituut, Driebergen. 24 p.
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Verwerken van maaisel voor landbouwkundig gebruik
Janmaat, L. 2015. Verwerken van maaisel voor landbouwkundig gebruik: Waarde van compost, bokashi en bermgraskuil als meststof. Louis Bolk Instituut, Driebergen. 39 p.
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Digestaat: Benutting Organische Kringloopstikstof
Cuijpers, W.J.M. and L. Janmaat. 2015. Digestate: Making use of nitrogen in biodigester waste. (In Dutch.). Rep. 2015‐029 LbP. Louis Bolk Instituut, Driebergen. 20 p.
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Bijen op het landbouwbedrijf
Luske, B. and L. Janmaat. 2015. Bees on the farm: Working on a bee-friendly countryside. (In Dutch.). Louis Bolk Instituut, Driebergen. 28 p.
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Maaimeststoffen in bedrijfs- en ketenverband: Plantaardige meststoffen in de praktijk
Hospers-Brands, A.J.T.M., G.J.H.M. van der Burgt and L. Janmaat. 2015. Cut green manures, on-farm and within the chain: Plant-based fertilizers in practice. (In Dutch, with English abstract.). 20 p.
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Aanleg en onderhoud van akkerranden
Luske, B., A.J.T.M. Hospers-Brands and L. Janmaat. 2015. Establishment and management of field margins: weed suppression. (In Dutch.). Louis Bolk Instituut, Driebergen. 20 p.
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Wintergroenten.nl
Janmaat, L., B. Willems and L. Mertens. 2014. Wintergroenten.nl: Tips for growing vegetables under glass. (In Dutch, with English abstract.). Louis Bolk Instituut, Driebergen. 28 p.
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Biodiversiteit onder glas: Voedsel voor luizenbestrijders
Janmaat, L., C. Bloemhard and R. Kleppe. 2014. Biodiversity in the greenhouse: Food for aphid enemies. (In Dutch.). Louis Bolk Instituut, Driebergen. 20 p.
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Compost composities
Cuijpers, W.J.M. and L. Janmaat. 2014. Compost compositions: Soil, fertilization and disease suppression. (In Dutch, with English abstract.). Louis Bolk Instituut, Driebergen. 20 p.
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Equivalentie van het EKO-keurmerk: Vergelijkende studie naar Europese Biologische Pluslabels
Koopmans, C.J. and L. Janmaat. 2014. Equivalency of the EKO label: Comparative study of European 'organic-plus' labels. (In Dutch.). Rep. 2014-015 LbP. Louis Bolk Instituut, Driebergen. 10 p.
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Weerbare bodemwijzer
Janmaat, L. and W.J.M. Cuijpers. 2012. Guide to a resistant soil. (In Dutch.). Rep. 2012-050 LbP. Louis Bolk Instituut, Driebergen. 12 p.
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Biowisselkas: Bredere vruchtwisseling voor een gezondere bodem
Cuijpers, W.J.M. and L. Janmaat. 2012. Organic greenhouse intercropping: Broadening crop rotations for a healthier soil. (In Dutch, with English abstract.). Rep. 2012-007 LbP. Louis Bolk Instituut, Driebergen. 42 p.
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Nieuwe wegen voor de veredeling van gewassen voor kleine markten
Nuijten, E., L. Janmaat and E.T. Lammerts van Bueren. 2012. New ways for breeding and selecting small scale crops: key elements for fruitfull cooperation in the chain. (In Dutch.). Rep. 2012-003 LbP. Louis Bolk Instituut, Driebergen. 34 p.
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Biologisch Ondernemen Legpluimvee
Wagenaar, J., L. Janmaat, M.W.P. Bestman, F. Leenstra, M. van Krimpen, C. Verwer, M. Groot, T. van Asseldonk and R. Paardekooper. 2012. Organic business: poultry. (In Dutch.). Louis Bolk Instituut, Driebergen. 28 p.
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Biologisch telen doe je in de grond
Janmaat, L. 2009. Biologisch telen doe je in de grond: Handleiding voor een vruchtbare kasbodem. Louis Bolk Instituut, Driebergen. 23 p.
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Cuijpers, W.J.M., L. Janmaat and G.J.H.M. van der Burgt. 2008. Soil health in organic greenhouse, Part 2: Suppressiveness against soil borne fungi. (In Dutch, with English abstract.). Rep. LB25. Louis Bolk Instituut, Driebergen. 52 p.
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Lammerts van Bueren, E.T., L. Janmaat and S.P.C. Groot. 2008. Uitgangsmateriaal voor smaakvolle producten: Kan plantaardig uitgangsmateriaal bijdragen aan de profilering van de biologische sector als leverancier van gezonde en smaakvolle producten? Rep. Plant Research International 250. Plant Research International, Wageningen.
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Specialist journal articles, newsletters, etc


Biologisch met kunst en vliegwerk
Janmaat, L. 2017. Biologisch met kunst en vliegwerk: Verslag van een studiereis met glasgroentetelers naar Sicilië. Ekoland. maart, p. 30-31.
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De Noorderhoeve
Janmaat, L. 2017. De Noorderhoeve: Synergie houdt gemengd landbouwbedrijf gaande. Ekoland. april, p. 20.
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Oirschot Organics houdt  van klein
Janmaat, L. 2017. Oirschot Organics houdt van klein: Gezocht en gewenst: jonge ondernemer voor de teelt van en klanten voor afname van minigroenten. Ekoland. maart, p. 17-19.
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Teeltrecepten voor nieuwe rassen
Janmaat, L. 2017. Teeltrecepten voor nieuwe rassen: De strijd tegen phytophthora gaat altijd door, nieuwe rassen vragen extra aandacht van de telers. Ekoland. februari, p. 30-31.
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Wat is beter: compost of bokashi?
Janmaat, L. 2017. Wat is beter: compost of bokashi? Ekoland. juni, p. 30-31.
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Cursus Demeter Voedingskwaliteit
Janmaat, L. 2016. Demeter Course on nutrition quality. (In Dutch.). Louis Bolk Instituut, Driebergen. 3 p.
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Koplopers in duurzaamheid
Janmaat, L. 2016. Koplopers in duurzaamheid: Tuinders en winkeliers nemen elkaar de maat. Ekoland. December, p. 32-33.
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Snelle opschaling resistente aardappelrassen gewenst
Janmaat, L. 2016. Rapid upscaling of resistant potato varieties needed: current wet period highlights crop susceptibility to Phytophthhora. (In Dutch.). Ekoland. Juli/augustus, p. 32-33.
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Verdiepingscursus: Doorschakelen naar Demeter
Janmaat, L. 2016. In-depth course: Converting to Demeter. (In Dutch.). Louis Bolk Instituut, Driebergen. 2 p.
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Eerlijk zaad als basis van biologische producten
Janmaat, L., E. Nuijten and E.T. Lammerts van Bueren. 2016. Fair seed as a basis for organic products: Eosta takes a stand and supports the breeding of open-pollinated varieties. (In Dutch.). Louis Bolk Instituut, Driebergen. 4 p.
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Fair seed as a basis for organic products
Janmaat, L., E. Nuijten and E.T. Lammerts van Bueren. 2016. Fair seed as a basis for organic products: Eosta takes a stand and supports the breeding of open-pollinated varieties. Louis Bolk Instituut, Driebergen. 4 p.
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Freies Saatgut als Basis für Bio-Lebensmittel
Janmaat, L., E. Nuijten and E.T. Lammerts van Bueren. 2016. Fair seed as a basis for organic products: Eosta takes a stand and supports the breeding of open-pollinated varieties. (In German.). Louis Bolk Instituut, Driebergen. 4 p.
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Compost and soil ecosystem resilience in organic greenhouses
Cuijpers, W.J.M., L. Janmaat and J.G. Fuchs. 2016. Compost and soil ecosystem resilience in organic greenhouses. p. 13-27. In Van der Wurff, A., J.G. Fuchs M. Raviv and A.J. Termorsthuizen. (ed.) Handbook for Composting and Compost Use in Organic Horticulture.
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How growers can assess compost quality
Fuchs, J.G. and L. Janmaat. 2016. How growers can assess compost quality. p. 99-104. In Van der Wurff, A.W.G., J.G. Fuchs, M. Raviv and A.J. Termorshuizen. (ed.) Handbook for Composting and Compost Use in Organic Horticulture.
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What control measures do we need for compost production and use
Fuchs, J.G., L. Janmaat and M. Raviv. 2016. What control measures do we need for compost production and use. p. 53-62. In Van der Wurff, A.W.G., J.G. Fuchs, M. Raviv and A.J. Termorshuizen. (ed.) Handbook for Composting and Compost Use in Organic Horticulture.
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Organic 3.0
Lammerts van Bueren, E.T. and L. Janmaat. 2016. Organic 3.0. (In Dutch.). Ekoland. Januari, p. 18-19.
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Met bomen meer bijen
Luske, B. and L. Janmaat. 2016. More trees, more bees: Bringing back on-farm trees and shrubs. (In Dutch.). Ekoland. oktober, p. 20-21.
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Compost power
Janmaat, L. 2015. Compost power: Compost reduces dependence on livestock manure in arable farming and horticulture. (In Dutch.). Ekoland. Januari 2015, p. 16-19.
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Digestaat, gebruik en regelgeving
Janmaat, L. 2015. Digestate: Usage and regulations. (In Dutch.). Ekoland. April 2015, p. 14-15.
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Jaar van de Bodem blijft inspireren
Janmaat, L. 2015. The International Year of Soils is a constant source of inspiration: Agri-businesses also committed to sustainable soil management. (In Dutch.). Ekoland. Juli/augustus 2015, p. 16-17.
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Op zoek naar het ideale bodemprofiel
Janmaat, L. 2015. In search of the ideal soil profile: Crumbly soil, red and grey worms, soil crawlers and the pros and cons of rotary tillage. (In Dutch.). Ekoland. Februari 2015, p. 21.
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Bijen horen er bij
Janmaat, L. and B. Luske. 2015. Where would we be without bees? Bees take care of pollination and contribute to on-farm biodiversity. (In Dutch.). Ekoland. september 2015, p. 14-15.
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Get a taste of new talented Robust potato cultivars
Lammerts van Bueren, E.T., L. Janmaat and A. Zeelenberg. 2015. Get a taste of new talented Robust potato cultivars. Louis Bolk Instituut, Driebergen. 8 p.
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Nieuwsbrief Bloeiend Bedrijf #12
Luske, B., D. Dirks, L. Janmaat, R. Boevink, M. Boogaard, J. Zevenbergen, I. Barten, D. van der Maat, A. Koelemeijer, C. van den Berg and L. Daniels. 2015. Newsletter Flourishing Farm #12. (In Dutch, with English abstract.). Louis Bolk Instituut, Driebergen.
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Nieuwsbrief Bloeiend Bedrijf #11
Luske, B., J.W. Erisman, L. Janmaat and L. Daniels. 2015. Newsletter Flourishing Farm #11. (In Dutch, with English abstract.). Louis Bolk Instituut, Driebergen.
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Various ways for successful Cultivar introduction in the market
Nuijten, E., A. Zeelenberg, L. Janmaat and E.T. Lammerts van Bueren. 2015. Various ways for successful Cultivar introduction in the market. Louis Bolk Instituut, Driebergen. 6 p.
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De oogst van Bloeiend Bedrijf
Steenbruggen, A., B. Luske, D. Dirks, J.W. Erisman and L. Janmaat. 2015. The harvest of the Flourishing Farm project: Flowering field margins for natural pest control. (In Dutch, with English abstract.). Louis Bolk Instituut, Driebergen. 20 p.
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Alle presentaties van de netwerkbijeenkomst Reststromen in de akkerbouw: kans of risico?
Verwer, C., H. van Kasteren, J. Gielen, J. Postma, L. Janmaat, L. Vermaas and W. Verstraete. 2015. Presentations of the meeting "Using residues in arable farming: opportunity or risk?". (In Dutch, with English abstract.).
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Op zoek naar de ideale aardappel
Janmaat, L. 2014. In search of the ideal potato: Introduction of a new resistant potato varieties takes time and effort. (In Dutch.). Ekoland. December 2014, p. 30-31.
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Praktijknetwerken Nieuwsbrief Oktober 2014
Janmaat, L. 2014. Growers' networks - Newsletter October 2014. (In Dutch.). Louis Bolk Instituut, Driebergen.
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Afsluiting praktijknetwerken 26 november 2014: Wat is goede compost?
Janmaat, L., W.J.M. Cuijpers, B. Willems and M. Mulder. 2014. What is good compost? Presentation held at the closing conference of three growers' networks, 26 November 2014. (In Dutch.).
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Agroforestry, hype of duurzaam perspectief?
Bestman, M.W.P. and L. Janmaat. 2014. Agroforestry, hype or sustainable prospect? Research shows that agroforestry is useful, but is it also profitable? (In Dutch.). Ekoland. Juli/augustus, p. 22-23.
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Maak kennis met nieuwe talentvolle robuuste aardappelrassen
Lammerts van Bueren, E.T., L. Janmaat and A. Zeelenberg. 2014. Get a taste of new talented Robust potato cultivars. (In Dutch, with English abstract.). Louis Bolk Instituut, Driebergen. 8 p.
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Nieuwsbrief Bloeiend Bedrijf #10
Luske, B., L. Janmaat, J. de Wit, M. Vlaswinkel and L. Daniels. 2014. Flourishing Farm, Newsletter #10. (In Dutch, with English abstract.). Louis Bolk Instituut, Driebergen.
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Geintegreerde beheersing van het graanhaantje
Luske, B., L. Janmaat, M.M. Bos and L. Daniels. 2014. Integrative pest control of the Cereal Leaf Beatle. (In Dutch, with English abstract.). Louis Bolk Instituut, Driebergen. 2 p.
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Akkernatuur - Herken en stimuleer nuttige natuur
Bos, M.M., B. Luske and L. Janmaat. 2014. Field nature: recognize and stimulate useful nature. (In Dutch.). Louis Bolk Instituut, Driebergen. 32 p.
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De in's en out's van moderne hybridisatie van groenterassen: hybridezaden kunnen door traditionele methoden of door genetische modificatie technieken worden ontwikkeld
Janmaat, L. 2013. The ins and outs of modern hybridization of vegetable varieties: hybrid seeds can be developed through traditional methods or through genetic modification techniques. (In Dutch.). Ekoland. 33(9):22-23.
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Duurzaamheidstoets voor biologische ondernemers: een overzicht van duurzaamheidstoetsen en hun toepassingen
Janmaat, L. 2013. Sustainability assessment for organic entrepreneurs: an overview of sustainability assessment tools and their applications. (In Dutch.). Ekoland. 33(4):8-9.
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KennisCoalitie Organics: nieuw samenwerkingsverband in onderwijs
Janmaat, L. 2013. The Organics Knowledge Coalition: a new collaborative partnership in agricultural education. (In Dutch, with English abstract.). Ekoland. 33(1):25-25.
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Praktijknetwerken Nieuwsbrief December 2013
Janmaat, L. 2013. Growers' networks - Newsletter December 2013. (In Dutch.). Louis Bolk Instituut, Driebergen.
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Praktijknetwerken Nieuwsbrief juli 2013
Janmaat, L. 2013. Growers' networks - Newsletter July 2013. (In Dutch.). Louis Bolk Instituut, Driebergen.
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Bio-landbouw toegerust voor fosfaatkringlopen: goede bodemstructuur en bodemleven bron van fosfaat
Bokhorst, J.G. and L. Janmaat. 2013. Organic agriculture well equipped for phosphate cycling: good soil structure and healthy soil life are a source of phosphate. (In Dutch.). Ekoland. 33(7/8):22-23.
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New models for plant breeding: Key elements for collaboration within the food chain
Nuijten, E., L. Janmaat and E.T. Lammerts van Bueren. 2013. New models for plant breeding: Key elements for collaboration within the food chain. Wageningen UR, Louis Bolk Instituut, Wageningen, Driebergen. 4 p.
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Pioniersgeest blijft: op het bedrijf van de Jonkmannen zorgen pompoenen voor continuïteit
Schlaman, G. and L. Janmaat. 2013. The pioneer spirit persists: Pumpkins are the driving factor of the Jonkmans family's farm. (In Dutch.). Ekoland. 33(7/8):18-21.
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Wintergroenten Nieuwsbrief April 2013
Bos, H., L. Mertens, M. van Diemen, L. Janmaat and W.J.M. Cuijpers. 2013. Winter Vegetables Newsletter April 2013. (In Dutch.). Louis Bolk Instituut, Driebergen.
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Bemesten met  visie en precisie : Bodemonderzoekers geven hun visie op bodemanalysecijfers, mineralenverhouding en precisiebemesting
Janmaat, L. 2012. Fertilize with vision and precision: Soil researchers give their views on soil analysis figures, mineral ratio and precision fertilization. (In Dutch.). Ekoland. 32(5):10-11.
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Bolkpionier Jan Bokhorst  gaat met pensioen : Eigen identiteit van de biologische landbouw moet onderscheidend zijn
Janmaat, L. 2012. Jan Bokhorst, pioneer of Louis Bolk Institute, retires: "Own identity of organic farming should be distinctive". (In Dutch.). Ekoland. 32(1):22-23.
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Van bestraffende controle naar  stimulerende certificering : Biologisch-dynamische boeren inspireren elkaar door middel van collegiale toetsing
Janmaat, L. 2012. From penalizing verification to stimulating certification: Biodynamic farmers inspire each other by means of peer review. (In Dutch.). Ekoland. 32(9):26-27.
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Nieuwsbrief Bodemacademie #15
Leendertse, P., W.J.M. Cuijpers, L. Janmaat, N.J.M. van Eekeren, A. Lommen, A. Guldemond, J.G. Bokhorst, H. Kloen and B. Aasman. 2012. Newsletter Soil Academy #15. (In Dutch.). Louis Bolk Instituut; CLM, Driebergen; Culemborg.
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Bedrijf in Beeld - Arnica Kwekerij beheert biodiversiteit
Janmaat, L. 2011. Farm in focus - Arnica Kwekerij manages and preserves biodiversity. (In Dutch.). Ekoland. 9-2011, p. 18-21.
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Biologische glastuinbouw de grond uit? Discussie over invulling spelregels binen EU  laait op
Janmaat, L. 2011. Soil-less organic horticulture? A growing discussion on the interpretation of EU rules. (In Dutch.). Ekoland. 4-2011, p. 22-23.
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Landbouw, natuur en de rol van boer en overheid - een interview met Geert de Snoo
Janmaat, L. 2011. Agriculture, nature and the role of farmers and government - an interview with Geert de Snoo. (In Dutch.). Ekoland. 9-2011, p. 12-13.
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Bedrijfsnetwerk   pluimveehouderij verbindt: Meer afstemming tussen opfokkers, broederijen en legpluimveehouders
Wagenaar, J. and L. Janmaat. 2011. Farmers network poultry farming connects: more synchronisation between breeders, hatcheries and laying hen farmers. (In Dutch.). Ekoland. 5-2011, p. 26-27.
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Biologische mestwensen: Alle uitgangspunten, regels en knelpunten
Janmaat, L. 2010. Wishes for organic fertilisation: principles, rules and bottlenecks. (In Dutch.). Ekoland. 10-2010, p. 36-37.
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Natuurlijk middel ruimt ziekteverwekkers op
Janmaat, L. 2010. Natuurlijk middel ruimt ziekteverwekkers op. Ekoland. 3-2010, p. 18-20.
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Van wieg tot wieg
Janmaat, L. 2010. Van wieg tot wieg: Van regel tot regel. Ekoland. 2-2010, p. 25-27.
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Nieuwsbrief Bodemacademie #8
Janmaat, L., G.J.H.M. van der Burgt, M. Zanen, L. Vlaar and P. Leendertse. 2010. Nieuwsbrief Bodemacademie #8. Louis Bolk Instituut; CLM, Driebergen; Culemborg.
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Janmaat, L. and H. Brinks. 2010. Biologische tafelaardappels: eet smakelijk? Deelnemers BioImpuls werken aan productieverbetering. Ekoland. 12-2010, p. 10-11.
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Nieuwsbrief Bodemacademie #6: Special fosfaat
Janmaat, L., J.G. Bokhorst, C. Rougoor, W. Chardon, P. van Erp, A. Reijneveld, R. Postma, B.G.H. Timmermans and G.J.H.M. van der Burgt. 2010. Nieuwsbrief Bodemacademie #6: Special fosfaat. Louis Bolk Instituut; CLM, Driebergen; Culemborg.
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Nieuwsbrief Bodemacademie #7
Staps, J.J.M., M. Zanen, A. Visser, H. Kloen, J.G. Bokhorst, L. Janmaat and G.J.H.M. van der Burgt. 2010. Nieuwsbrief Bodemacademie #7. Louis Bolk Instituut; CLM, Driebergen; Culemborg.
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Janmaat, L. 2009. Biokwekerij Poldervaart: Biologisch telen is een grote ontdekkingsreis. Ekoland. 2009-3, p. 20-21.
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Janmaat, L. 2009. Klimaatneutrale biokas: Verticale luchtbeweging zorgt voor doorbraak. Ekoland. 10-2009, p. 20-21.
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Janmaat, L. 2009. Verdieping door beroepsontwikkeling: Aandacht voor de persoon in het bedrijf. Ekoland. 2009-1, p. 25.
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Nieuwsbrief Bodemacademie #3
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Staps, J.J.M., L. Janmaat, M. Zanen and W. van Weperen. 2009. Nieuwsbrief Bodemacademie #4. Louis Bolk Instituut; CLM, Driebergen; Culemborg.
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