000			02744nam a22003977a 4500
001			G65020
003			MX-TxCIM
005			20211006075737.0
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020			_a92-9146-025-7
040			_aMX-TxCIM
072		0	_aE10
072		0	_aF01
072		0	_aF04
082	0	4	_a633.15 _bEAS No. 5
100	1		_aBenson, T.D. _uMaize Productivity Gains through Research and Technology Dissemination. Proceedings of the Eastern and Southern Africa Regional Maize Conference, 5; Arusha (Tanzania); 3-7 Jun 1996
110	2		_aCentro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico)
245	0	0	_aA geographical and economic analysis of past nitrogen response trial results for maize in Malawi
260			_aAddis Ababa (Ethiopia) _bCIMMYT : _c1997
340			_aPrinted
520			_aIn the 1995/96 growing season, the agricultural research and extension services of the Malawi government jointly evaluated provisional area-specific fertilizer recommendations for maize grown by smallholders throughout the country. These recommendations are to replace a blanket recommendation currently in place. To complement that work, in this paper I present the results of a statistical and economic evaluation of historical nitrogen (N) response trial data. Yield results were used from 500 nutrient response trials implemented at close to 300 sites on farmers' fields throughout Malawi by the Department of Agricultural Research from 1970 through 1993. This research involved evaluating and cleaning the data set, assigning trial sites to fertilizer recommendation zones, and calculating through multiple regression the coefficients of both the linear and the quadratic N-response functions at each site. The current provisional area-specific recommendations are evaluated in light of the results of this analysis. The quadratic response curves are used to determine the optimum nitrogen application in each zone under current fertilizer and maize prices. Finally, suggestions are made as to how the recommendations can be extended in scope and content to enable extension agents to offer farmers flexible and appropriate information on inorganic N-fertilizer management.
546			_aEnglish
591			_a9801|AGRIS 9702
593			_aJose Juan Caballero
595			_aCPC
650	1	7	_aEconomic analysis _gAGROVOC _2 _91088
650	1	0	_aGeography
650	1	0	_aMalawi
650	1	0	_91213 _aPlant response _gAGROVOC
650	1	0	_aTrials
653	0		_aCIMMYT
650	1	0	_91314 _aZea mays _gAGROVOC
650	1	0	_91190 _aNitrogen fertilizers _gAGROVOC
700	1		_aRansom, J.K.|Palmer, A.F.E.|Zambezi, B.T.|Mduruma, Z.O.|Waddington, S.R.|Pixley, K.V.|Jewell, D.C. _eeds.
942			_cPRO
999			_c9527 _d9527