On-farm evaluation of fertilizer response of two recently-released bread wheat varieties in Ethiopia
1999
Asefa Taa | Tanner, D.G. | Duga Debele | Yesuf Assen
Multi-location on-farm fertilizer trials were conducted for two seasons (1995 and 1996) in two sets (factorial N by P rate trials and N rate by application timing trials) in the highlands of Ethiopia to examine the fertilizer response of two recently released bread wheat cultivars. The results exhibited differential crop response to applied N and P in the various agro-ecological zones. Wheat grain yield response surfaces demonstrated that the semi-dwarf cultivar Qubsa was markedly superior to the tall cultivar Mitike in terms of grain yield across all zones. However, under a high level of bromegrass infestation, the response curves for the two cultivars were similar. The percentN levels in the grain and straw of Mitike were higher than the corresponding N contents of Qubsa. However, Qubsa exhibited higher grain N uptake (GNU) and total N uptake (TNU) levels than Mitike due to its higher grain yield levels across all N rates. In terms of GNU, Mitike with 123 kg N/ha resulted in the same level of GNU as Qubsa at O N. The results of the N rate by application timing trial showed that the main effects of N rate and variety on grain yield were significant. Mitike was lower yielding than Qubsa across both locations and all N rates. There was no consistent response to N application timing in the present study, but split application tended to enhance grain yield at some sites.
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