000			02787nam a22004337a 4500
001			G65915
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		_aManupeerapan, T. _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	_aMaize breeding for drought tolerance in Thailand
260			_aMexico, DF (Mexico) _bCIMMYT : _c1997
340			_aPrinted
520			_aDrought stress damages an estimated 3 to 22% of the planted maize area in Thailand every year, resulting in yield losses estimated to be from 129,000 to 858,000 metric tons, worth 10 to 80 million US dollars. The maize breeding program for drought tolerance was established in Thailand in 1982. The maize population KK-DR was developed from six source materials and has been improved for tolerance to drought using an S1 recurrent selection scheme. After three cycles of population improvement, three synthetic varieties were developed. These three synthetics, together with seven other open-pollinated varieties and six hybrid varieties, were evaluated in 1991 and 1992 to compare yield potential and other agronomic characters under artificial water stress and non-stress conditions in the summer season. The experiments were also conducted in both years under rainfed conditions in the rainy season to compare seasonal effects. In general, hybrids outyielded the open-pollinated varieties under drought, and by an even greater margin under well-watered conditions. The results demonstrated, however, that not all hybrids performed better than the open-pollinated varieties under drought; one of the synthetic varieties showed higher yield potential and more drought tolerance than some hybrids. Maize grown in the summer season under plentiful water showed higher yield potential than in the rainy season.
546			_aEnglish
591			_a9802|AGRIS 9702
593			_aJose Juan Caballero
595			_aCPC
650	1	0	_aDrought resistance
650	1	0	_91081 _aDrought stress _gAGROVOC
650	1	0	_aRecurrent selection
650	1	0	_aThailand _91290
653	0		_aCIMMYT
650	1	0	_91314 _aZea mays _gAGROVOC
650	1	0	_91313 _aYields _gAGROVOC
650	1	7	_aPlant breeding _gAGROVOC _2 _91203
700	1		_aChantachume, Y., _ecoaut.
700	1		_aEdmeades, G.O.|Banziger, M.|Mickelson, H.R.|Pena-Valdivia, C.B. _eeds.
700	1		_aGrudloyma, P., _ecoaut. _92050
700	1		_aNoradechanon, S., _ecoaut.
700	1		_aThong-chuay, S., _ecoaut.
942			_cPRO
999			_c3754 _d3754