Nitrogen release and synchrony in organic and conventional farming systems of the central highlands of Kenya

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dc.creatorMusyoka, M.W.
dc.creatorAdamtey, N.
dc.creatorBünemann, Else K.
dc.creatorMuriuki, A.W.
dc.creatorKaranja, E.N.
dc.creatorMucheru-Muna, M.
dc.creatorFiaboe, K.K.M.
dc.creatorCadisch, Georg
dc.date2019-04
dc.date2019-05-10T09:47:48Z
dc.date2019-05-10T09:47:48Z
dc.date.accessioned2026-06-27T15:49:45Z
dc.descriptionTo match Nitrogen (N) supply to crop N demand, it is essential to understand N release and uptake patterns in different farming systems and crops. To assesses the dynamics of N released in organic and conventional systems and potential synchrony and asynchrony in crop N uptake, a study was conducted over three cropping seasons (potato, maize and leafy vegetables) at two sites in the Central Highlands of Kenya. Mineral-N release and synchrony were monitored in conventional and organic systems at high (recommended N, P, pesticides and irrigation) and low input (low N, P, pesticide use and rainfed) systems. Mineral-N release was assessed using in situ buried bags and N synchrony was measured by the daily differences in N fluxes. The percentage of N applied released during potato (38%) and vegetable (44%) cropping seasons were similar between systems. However, under maize strong temporal N immobilization from inputs occurred, particularly at Thika, related to the poor quality of manure and compost (lignin:N ratio > 13). In all systems, excess-asynchrony of available N was pronounced during vegetative stages and at harvest, while insufficient-asynchrony occurred at reproductive stages. During potato cropping season at Thika, Org-High showed highest positive N fluxes (> 20 kg N ha−1 day−1) at planting and tuber bulking stage. At early stages of maize and vegetables Org-Low and Org-High experienced up to 5 times larger negative N fluxes (insufficiency) compared to conventional treatments at Chuka site. The study recommends reducing N applications at planting and increasing N dosages at reproductive stages of crops.
dc.identifierhttps://hdl.handle.net/10568/101235
dc.identifier.urihttp://hdl.handle.net/123456789/114675
dc.languageen
dc.publisherSpringer
dc.rightsLimited Access
dc.sourceMusyoka, M.W., Adamtey, N., Bünemann, E.K., Muriuki, A.W., Karanja, E.N., Mucheru-Muna, M., ... & Cadisch, G. (2019). Nitrogen release and synchrony in organic and conventional farming systems of the central highlands of Kenya. Nutrient Cycling in Agroecosystems, 1-23.
dc.subjectincubation
dc.subjectmineralization
dc.subjectorganic
dc.subjectinputs
dc.subjectquality
dc.titleNitrogen release and synchrony in organic and conventional farming systems of the central highlands of Kenya
dc.typeJournal Article

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Instituto Internacional de Agricultura Tropical (IITA)