Nitrogen release and synchrony in organic and conventional farming systems of the central highlands of Kenya
To 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...
| Autores principales: | , , , , , , , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
Springer
2019
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| Materias: | |
| Acceso en línea: | https://hdl.handle.net/10568/101235 |
| _version_ | 1855513382919077888 |
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| author | Musyoka, M.W. Adamtey, N. Bünemann, Else K. Muriuki, A.W. Karanja, E.N. Mucheru-Muna, M. Fiaboe, K.K.M. Cadisch, Georg |
| author_browse | Adamtey, N. Bünemann, Else K. Cadisch, Georg Fiaboe, K.K.M. Karanja, E.N. Mucheru-Muna, M. Muriuki, A.W. Musyoka, M.W. |
| author_facet | Musyoka, M.W. Adamtey, N. Bünemann, Else K. Muriuki, A.W. Karanja, E.N. Mucheru-Muna, M. Fiaboe, K.K.M. Cadisch, Georg |
| author_sort | Musyoka, M.W. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | To 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. |
| format | Journal Article |
| id | CGSpace101235 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2019 |
| publishDateRange | 2019 |
| publishDateSort | 2019 |
| publisher | Springer |
| publisherStr | Springer |
| record_format | dspace |
| spelling | CGSpace1012352023-12-08T19:36:04Z Nitrogen release and synchrony in organic and conventional farming systems of the central highlands of Kenya Musyoka, M.W. Adamtey, N. Bünemann, Else K. Muriuki, A.W. Karanja, E.N. Mucheru-Muna, M. Fiaboe, K.K.M. Cadisch, Georg incubation mineralization organic inputs quality To 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. 2019-04 2019-05-10T09:47:48Z 2019-05-10T09:47:48Z Journal Article https://hdl.handle.net/10568/101235 en Limited Access Springer Musyoka, 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. |
| spellingShingle | incubation mineralization organic inputs quality Musyoka, M.W. Adamtey, N. Bünemann, Else K. Muriuki, A.W. Karanja, E.N. Mucheru-Muna, M. Fiaboe, K.K.M. Cadisch, Georg Nitrogen release and synchrony in organic and conventional farming systems of the central highlands of Kenya |
| title | Nitrogen release and synchrony in organic and conventional farming systems of the central highlands of Kenya |
| title_full | Nitrogen release and synchrony in organic and conventional farming systems of the central highlands of Kenya |
| title_fullStr | Nitrogen release and synchrony in organic and conventional farming systems of the central highlands of Kenya |
| title_full_unstemmed | Nitrogen release and synchrony in organic and conventional farming systems of the central highlands of Kenya |
| title_short | Nitrogen release and synchrony in organic and conventional farming systems of the central highlands of Kenya |
| title_sort | nitrogen release and synchrony in organic and conventional farming systems of the central highlands of kenya |
| topic | incubation mineralization organic inputs quality |
| url | https://hdl.handle.net/10568/101235 |
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