Agronomic and economic evaluation of the on-farm N and P response of bread wheat grown on two contrasting soil types in central Ethiopia
2000
Tarekegne, A. (Holetta Agricultural Research Center, Addis Ababa (Ethiopia)) | Tanner, D.G. (Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Addis Ababa (Ethiopia)) | Tessema, T. (Ambo Research Center, Addis Ababa (Ethiopia)) | Mandefro, C. (Holetta Agricultural Research Center, Addis Ababa (Ethiopia))
Nutrient deficiency is one of the major constraints to wheat (Triticum spp.) production in Ethiopia. A multi-locatjon on-farm N and p fertilizer trial was conducted during the 1995 and 1996 cropping seasons in a poorly drained Vertisol zone, using an improved drainage technique, and in a highly-weathered reddish-brown Nitisol zone in the central highland of Ethiopia. The objectives were to determine yield and yield component response of a recently-released, high-yielding bread wheat (7: aestivum) cultivar to applied nitrogen (N) and phosphorus (P) rates, and to generate zone-specific, economically-optimal N and p recommendations for wheat production in central Ethiopia. The results from the combined analyses for each zone indicated a highly significant yield response to fertilizer application. Wheat grain yield responded significantly to both N and p in each soil zone, although the response to N was more pronounced. N by p interaction was nonsignificant for virtually all crop parameters studied in both zones. Optimum N and P2OS nutrient rates were established for each zone using discrete and continuous economic analyses under three costlprice scenarios. Optimum nutrient rates were presented in a user-friendly tabular format for ease of interpretation by extension staff and policy-makers. Such a tabular format provides a dynamic template for extension staff to use when determining rates of N and P2OS to recommend, facilitates interpolation ofcostlprice levels, and can provide insights for policy-makers when estimating the potential impact of policy interventions affecting grain and nutrient price levels.
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
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