TY  - PRO
AU  - Asefa Taa
AU  - Duga Debele
AU  - Yesuf Assen
AU  - Tanner,D.G.
ED  - Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Addis Ababa (Ethiopia)
TI  - On-farm evaluation of fertilizer response of two recently-released bread wheat varieties in Ethiopia
SN  - 92-9146-058-3
PY  - 1999///
CY  - Addis Ababa (Ethiopia)
PB  - CIMMYT
KW  - Ethiopia
KW  - Fertilizer application
KW  - Fertilizers
KW  - AGROVOC
KW  - Nitrogen
KW  - Plant production
KW  - Varieties
KW  - Triticum
KW  - Triticum aestivum
KW  - Yields
KW  - CIMMYT
N2  - 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 %N 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
ER  -