Impact of cropping sequence and fertilizer application on key soil parameters after three years of a crop rotation trial
2000
Kamwaga, J. (Kenya Agricultural Research Institute, Njoro (Kenya)) | Tanner, D.G. (Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Addis Ababa (Ethiopia)) | Nassiumma, E.W. | Bor, P. (Kenya Agricultural Research Institute, Njoro (Kenya))
A rotation trial was established at Njoro, Kenya, in 1992 to assess the impact of 16 cropping sequences and four fertilizer levels on crop productivity and soil parameters in a wheat-based cropping system. Soybean (Glycine max), rapeseed (Brassica napus), potato (Solanum tuberosum) and maize (Zea mays) were grown in rotation with wheat (Triticum aestivum)the control treatment consisted of continuous wheat. Post-harvest soil samples were taken from three depths in 1994 and analyzed for soil organic matter (SOM), pH, NO3-N, and P. SOM was not influenced by cropping sequence. Applied N with or without P significantly increased SOM, while applied P with or without N significantly decreased SOM. Measurable P was not influenced by cropping sequence or by applied N, but was significantly increased by applied P. Soil NO3-N was highly influenced by cropping sequence at all sampled depths, and by applied N at the top two depths. Crop rotations including potato exhibited higher levels of soil NO3-N relative to continuous wheat. The other crop rotations did not apparently influence soil NO3-N level. Soil pH was neither influenced by cropp~g sequence or by applied N or P.
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