The effects of nitrogen and phosphorus fertilizers on several crop and soil parameters of small-holder bread wheat in Ethiopia
1991
Tanner, D.G. (Centro Internacional de Mejoramiento de Maiz y Trigo, Addis Ababa (Ethiopia)) | Taa, A. | Gorfu, A. (IAR, Addis Abbaba (Ethiopia))
In farming system surveys conducted in the bread wheat producing regions of Ethiopia, peasant farmers cited low soil fertility as one of their major production constraints. However, improvement of the fertility status of their fields through the application of recommended rates of chemical fertilizers has been limited both by the shortage of fertilizer supplies and by cash constraints. Fertilizer trials conducted on bread wheat in farmers' fields from 1988-1990 indicated that fertilizer N and P2O5 have significant effects on soil and crop parameters, weed density and disease incidence. At some locations, post-harvest soil N was increased by the application of fertilizer N, soil pH was decreased by N, and soil organic matter content was increased by P2O5. The density of wild oat panicles in the mature wheat crop increased due to fertilizer N, while P2O5 decreased wild oat density. A high N rate broadcast at sowing increased the labor required for hand weeding. Stripe rust incidence was increased by both fertilizer N and P2O5, but the effect of N was more pronounced
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