000			02870nam a22004577a 4500
001			G78586
003			MX-TxCIM
005			20240919021102.0
008			121211s ||||f| 0 p|p||0|| |
020			_a970-648-106-0
040			_aMX-TxCIM
072		0	_aE16
072		0	_aF01
090			_aCIS-3832
100	1		_aNarro, L.A. _uBook of abstracts: Arnel R. Hallauer international symposium on plant breeding; Arnel R. Hallauer International Symposium on Plant Breeding; Mexico, D.F. (Mexico); 17-22 Aug 2003
110	0		_aCentro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico)
245	0	0	_aGeneration of improved maize germplasm tolerant to both abiotic and biotic stresses
260			_aMexico, DF (Mexico) _bCIMMYT : _c2003
300			_ap. 54-55
340			_aPrinted
520			_aAcid soils in the world cover 30% of the total ice-free land area (3,950 million ha). Oxisols and ultisols are the most frequent acid soils in South America, covering 800 million ha in Brazil (70.9%), Colombia (8.3%), Peru (6.9%), Venezuela (6.4%), Bolivia (4.9%), Paraguay (1.2%), Ecuador (1.1%) and the remainder in the other countries (Von Uexkull and Mutert 1995; Cochrane 1979).Main limiting factors for maize production in these soils are low pH, Al toxicity, and phosphorus deficiency; however insects and diseases also cause important losses. Consequently, any strategy to increase maize production in these areas would include the development of acid soil maize cultivars that respond to a reasonable use of amendments and are tolerant to important diseases and pests. This is one of the objectives of the CIMMYT's South American Regional Maize Program (SARMP). Average maize production in the Colombian savanna, the major acid soil area in this country, is less than 0.5 t/ha using maize landraces. Yield potential of acid soil-tolerant open pollinated varieties (OPVs) and hybrids developed by CIMMYT and national agricultural research programs is 3 t/ha and 4.5 t/ha, respectively. The objectives of this study were to generate OPVs with tolerance to acid soils and tolerance to maize diseases in the tropics and evaluate these OPVs in acid and non-acid soil environments.
536			_aGlobal Maize Program
546			_aEnglish
591			_a0311|AGRIS 0301|AL-Maize Program
593			_aJuan Carlos Mendieta
594			_aINT2062
595			_aCSC
650	1	7	_aGermplasm _gAGROVOC _2 _91136
650	1	0	_aLatin America
650	1	7	_aMaize _gAGROVOC _2 _91173
650	1	0	_aProduction economics
650	1	0	_aSoil chemistry
650	1	0	_aYield factors
650	1	0	_91314 _aZea mays _gAGROVOC
650	1	0	_91151 _aHybrids _gAGROVOC
650	1	7	_aPlant breeding _gAGROVOC _2 _91203
650	1	7	_aAgricultural research _gAGROVOC _2 _91006
700	1		_aDe Leon, C., _ecoaut.
700	1		_aSalazar, F.., _ecoaut.
942			_cPRO
999			_c6903 _d6903