000			02768nam a22004337a 4500
001			G24957
003			MX-TxCIM
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040			_aMX-TxCIM
041	0		_aeng
043			_aUS
072		0	_aF01
072		0	_aF30
090			_aREP-4389
100	1		_aTimothy, D.H. _99489
245	1	0	_aDevelopment and spread of improved maize varieties and hybrids in developing countries
260			_aWashington, DC (USA) : _bAID, _c1988.
300			_axi, 71 pages
340			_aPrinted
520			_aMaize is the third most important cereal crop in the developing world, after rice and wheat. Attempts have beed made over many years to improve maize varieties and hybrids used in developing countries. National and international programs have been involved. In the latter case, research has been concentrated at the International Maize and Wheat Improvement Center (CIMMYT) in Mexico and the International Institute of Tropical Agriculture (IITA) in Higeria. Both centers carry out their work in collaboration with national research programs. Although the adoption of high-yielding wheat varieties developed by CIMMYT and of rice developed by other centers has been well documented, the same is not true of maize. Part of the rearon is that the genetics of maize are quite different drom, and much more complicated than, wheat or rice. Improved varieties are not as easily identified visually. Also relatively little effort has been put into the measurement process. As a result, it is not well known how much impact the maize research programs have had at the farm level. This report is a first step in rectifiying this information gap. In attempts to identify the maize varieties, hybrids, population, pools, and lines developed by CIMMYT and IITA that are being used in national programs in developing nations. It also incorporates, where available, estimates of area planted with hybrids and improved varieties. Further work is needed to more fully document and the main gene pools and to verify and expand the statistical data at the national level.
546			_aText in English
591			_aMIC 10203-R
595			_aRPC
650	1	7	_aAgronomic characters _91008 _2AGROVOC
650	1	7	_aBreeding methods _91030 _2AGROVOC
650	1	7	_aCultivation _91071 _2AGROVOC
650	1	7	_aGermplasm _91136 _2AGROVOC
650	1	7	_aInternational cooperation _2AGROVOC _94895
650	1	7	_aCrop production _91063 _2AGROVOC
650	1	7	_aResearch _2AGROVOC _99142
650	1	7	_aUses _2AGROVOC _918934
650	1	7	_aVarieties _91303 _2AGROVOC
650	1	7	_91314 _aZea mays _2AGROVOC
650	1	7	_91151 _aHybrids _2AGROVOC
700	1		_aHarvey, P.H _927972
700	1		_aDowswell, C. _98713
942			_cBK _2ddc
999			_c35070 _d35070