000			02743nam a22004217a 4500
001			G70406
003			MX-TxCIM
005			20211006082148.0
008			121211s ||||f| 0 p|p||0|| |
020			_a92-9146-058-3
040			_aMX-TxCIM
072		0	_aF04
072		0	_aP11
090			_aLook under series title
100	1		_aMinale Liben _uRegional Wheat Workshop for Eastern, Central and Southern Africa, 10; University of Stellenbosch, South Africa; 14-18 Sep 1998
110	2		_aCentro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Addis Ababa (Ethiopia)
245	0	0	_aThe response of bread wheat to N and P application under improved drainage on bichena vertisols in North-Western Ethiopia
260			_aAddis Ababa (Ethiopia) _bCIMMYT : _c1999
340			_aPrinted
520			_aA multi-location wheat fertilizer response trial was conducted on farmers' fields on the poorly drained Vertisols of Bichena in north-western Ethiopia during 1996 and 1997. The principal objective of the trial was to determine economic optimum rates of N and P fertilizer for the high-yielding semi-dwarf bread wheat cultivar HAR 1685, using an improved drainage technology known as broad bed and furrow (BBF). The results indicate an extremely high grain yield response to N and a lesser, but significant, response to P. Bread wheat exhibited a high agronomic efficiency (AE) of N response: even at 138 kg N ha-l, AE exceeded 14 kg grain per kg applied N. The highest mean grain yield, 3317 kg ha-l, was obtained with the application of 138-92 kg N-P2O5 ha-l, representing a yield increase of 2336 kg ha-1 over the control (i.e., nil fertilizer) treatment. All crop parameters responded more to N than to P fertilizer. Under two contrasting cost/price scenarios, partial budget analysis indicated that 138-46 kg N-P205 ha-1 was the most profitable of the nutrient combinations tested. Optimum nutrient rates based on continuous economic analysis of the grain yield response surface were not in agreement with the results of the discrete analysis, primarily because of the high degree of linearity on response and the significant N by P interaction.
546			_aEnglish
591			_a0007|AGRIS 0101|R99-00CIMPU|AL-Wheat Program
593			_aJose Juan Caballero
595			_aCPC
650	1	0	_aDrainage
650	1	0	_aEthiopia
650	1	0	_aFertilizer application _91110
650	1	7	_aFertilizers _gAGROVOC _2 _91111
650	1	0	_91213 _aPlant response _gAGROVOC
650	1	0	_aSoil types _92200
650	1	0	_aVertisols _91304
653	0		_aCIMMYT
650	1	7	_aTriticum _gAGROVOC _2 _91295
700	1		_aAlemayehu Assefa, _ecoaut.
700	1		_aTilahun Tadesse, _ecoaut.
700	1		_9724 _aTanner, D.G. _ecoaut.
942			_cPRO
999			_c4498 _d4498