000			03075nam a22004337a 4500
001			G65783
003			MX-TxCIM
005			20240919021050.0
008			121211s ||||f| 0 p|p||0|| |
020			_a968-6923-93-4
040			_aMX-TxCIM
072		0	_aF30
072		0	_aH50
082	0	4	_a633.153 _bEDM
100	1		_aMungoma, C. _uDeveloping Drought- and Low N-Tolerant Maize. Proceedings of a Symposium; El Batan, Mex. (Mexico); 25- 29 Mar 1996
110	2		_aCentro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico)
245	0	0	_aDrought and low N in Zambia: _b The problems and a breeding strategy
260			_aMexico, DF (Mexico) _bCIMMYT : _c1997
340			_aPrinted
520			_aZambia is among the countries in the southern Africa region that has suffered from severe drought in three out of the last four seasons, the worst having occurred during 1991/92. The drought resulted in low production of maize, the staple food of the country, necessitating imports of the commodity. Low maize production was also exacerbated by a reduction in fertilizer usage, a result of removal of fertilizer subsidies. The solution in the agricultural sector has been to advocate crop diversification to encourage the growing of crops that are drought tolerant and those that can grow under low N or without additional fertilizer application. The latter can have detrimental effects of depleting soils through mining of nutrients. Since maize remains an important crop, efforts should be made to breed varieties that are drought tolerant or can lese N efficiently. The Maize Research Program in Zambia has not initiated a breeding program for drought and nitrogen use efficiency (NUE) as such. The program uses earliness as a drought escape mechanism. Selection of drought tolerant genotypes has been done in drought years and areas because of the lack of controlled environments for drought work. Collaboration with CIMMYT has resulted in selection of material from its drought tolerant populations that are undergoing population improvement and are being used to develop inbred lines. Similarly, populations from the NUE project have been obtained recently from CIMMYT and are being used in the breeding program. As an additional strategy, the performance of finished products (including released varieties) is being evaluated under low and high N conditions, with the hope of identifying the most NUE varieties.
546			_aEnglish
591			_a9801|AGRIS 9702
593			_aJose Juan Caballero
595			_aCPC
650	1	0	_aDrought resistance
650	1	0	_91081 _aDrought stress _gAGROVOC
650	1	0	_aNitrogen content
650	1	0	_aResistance to injurious factors
650	1	0	_aSelection
650	1	0	_aSouthern Africa
650	1	0	_aZambia
653	0		_aCIMMYT
650	1	0	_91314 _aZea mays _gAGROVOC
650	1	0	_91134 _aGenotypes _gAGROVOC
650	1	7	_aPlant breeding _gAGROVOC _2 _91203
700	1		_aEdmeades, G.O.|Banziger, M.|Mickelson, H.R.|Pena-Valdivia, C.B. _eeds.
700	1		_aMwambula, C., _ecoaut.
942			_cPRO
999			_c3685 _d3685