{"id":16753,"date":"2026-08-19T16:56:47","date_gmt":"2026-08-19T14:56:47","guid":{"rendered":"https:\/\/www.proefschriftmaken.nl\/portfolio\/david-kottelenberg\/"},"modified":"2026-08-20T17:17:08","modified_gmt":"2026-08-20T15:17:08","slug":"david-kottelenberg","status":"publish","type":"us_portfolio","link":"https:\/\/www.proefschriftmaken.nl\/en\/portfolio\/david-kottelenberg\/","title":{"rendered":"David Kottelenberg"},"content":{"rendered":"","protected":true},"excerpt":{"rendered":"","protected":true},"author":8,"featured_media":16754,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"us_portfolio_category":[45],"class_list":["post-16753","us_portfolio","type-us_portfolio","status-publish","post-password-required","hentry","us_portfolio_category-new-template"],"acf":{"main_text":"","naam_van_het_proefschift":"Harmonic weed suppression: competitive dynamics and design of cereal-legume intercrops","samenvatting":"Op landbouwakkers groeien veel plantensoorten naast de gewassen. Sommige verlagen de opbrengst en worden onkruiden genoemd. Onkruid wordt meestal bestreden met chemische middelen, maar die kunnen de natuur en de gezondheid van mensen schaden, en onkruiden worden steeds resistenter, dus boeren hebben alternatieven nodig. Mengteelt, het samen telen van twee gewassen op hetzelfde land, is een veelbelovende aanpak. Vooral graan-vlinderbloemige mengteelten werken goed: het graan onderdrukt onkruid sterk, terwijl de vlinderbloemige stikstof aan de bodem toevoegt, wat het graan nodig heeft.\n\nIn dit proefschrift onderzocht ik waarom zulke mengsels onkruid goed onderdrukken en hoe je ze kunt ontwerpen. Ik benaderde dit vanuit verschillende invalshoeken: veldproeven met veel gewascombinaties, computermodellen die individuele planten in 3D simuleren, en analyses van welke onkruidsoorten in elk systeem voorkomen. Samen lieten deze zien dat het sneller groeiende graan meestal zowel onkruid als de vlinderbloemige overheerst, maar dat een doordacht ontwerp onkruidonderdrukking kan afwegen tegen de opbrengst van beide gewassen, wat een weg biedt naar duurzamere teelt met minder chemische middelen.","summary":"Agricultural fields harbour many plant species besides crops. Some lower crop yields and are called weeds. Weeds are generally controlled with chemicals, but these can harm nature and human health, and weeds are growing more resistant, so farmers need alternatives. Intercropping, growing two crops together on the same field, is one promising approach. Cereal-legume intercrops work especially well: the cereal suppresses weeds strongly, while the legume adds nitrogen to the soil, which the cereal needs.\n\nIn this thesis I studied why such mixtures suppress weeds well and how they can be designed. I approached this from several angles: field experiments across many crop combinations, computer models that simulate individual plants in 3D, and analyses of which weed species appear in each system. Together these showed that the faster-growing cereal usually dominates weeds and legumes, but that careful design can balance weed suppression against the yields of both crops, offering a route towards more sustainable cropping with lower chemical inputs.","auteur":"David Kottelenberg","auteur_slug":"david-kottelenberg","publicatiedatum":"18 september 2026","taal":"NL","url_flipbook":"https:\/\/ebook.proefschriftmaken.nl\/ebook\/davidkottelenberg?iframe=true","url_download_pdf":"https:\/\/ebook.proefschriftmaken.nl\/download\/f7b9ca52-4c5b-48eb-ad30-f432f47164d9\/highres","url_epub":"","ordernummer":"19045","isbn":"978-94-6534-421-8","doi_nummer":"","naam_universiteit":"Wageningen University","afbeeldingen":16755,"video_url":"","podcast_url":"","naam_student:":"","binnenwerk":"","universiteit":"Wageningen University","cover":"","afwerking":"","cover_afwerking":"","design":""},"_links":{"self":[{"href":"https:\/\/www.proefschriftmaken.nl\/en\/wp-json\/wp\/v2\/us_portfolio\/16753","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.proefschriftmaken.nl\/en\/wp-json\/wp\/v2\/us_portfolio"}],"about":[{"href":"https:\/\/www.proefschriftmaken.nl\/en\/wp-json\/wp\/v2\/types\/us_portfolio"}],"author":[{"embeddable":true,"href":"https:\/\/www.proefschriftmaken.nl\/en\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/www.proefschriftmaken.nl\/en\/wp-json\/wp\/v2\/comments?post=16753"}],"version-history":[{"count":1,"href":"https:\/\/www.proefschriftmaken.nl\/en\/wp-json\/wp\/v2\/us_portfolio\/16753\/revisions"}],"predecessor-version":[{"id":16756,"href":"https:\/\/www.proefschriftmaken.nl\/en\/wp-json\/wp\/v2\/us_portfolio\/16753\/revisions\/16756"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.proefschriftmaken.nl\/en\/wp-json\/wp\/v2\/media\/16754"}],"wp:attachment":[{"href":"https:\/\/www.proefschriftmaken.nl\/en\/wp-json\/wp\/v2\/media?parent=16753"}],"wp:term":[{"taxonomy":"us_portfolio_category","embeddable":true,"href":"https:\/\/www.proefschriftmaken.nl\/en\/wp-json\/wp\/v2\/us_portfolio_category?post=16753"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}