000			03175nam a22004697a 4500
001			G80727
003			MX-TxCIM
005			20211006084755.0
008			121211s ||||f| 0 p|p||0|| |
020			_a970-648-120-6
040			_aMX-TxCIM
072		0	_aE16
072		0	_aP35
082	0	4	_a338.16 _bFRI
100	1		_aThe, C. _uIntegrated Approaches to Higher Maize Productivity in the New Millennium
110	0		_aCentro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT) Kenya
111	2		_a7. Proceedings of the Eastern and Southern Africa Regional Maize Conference _cNairobi (Kenya) _d5-11 Feb 2002
245	0	0	_aMaize grain yield correlated responses to change in acid soil characteristics after 3 years of soil amendments
260			_aNairobi (Kenya) _bKARI|CIMMYT : _c2002
300			_ap. 222-227
340			_aPrinted
520			_aA long-term agronomic experiment was conducted from 1996 to 2000 in Cameroon, on acid soil with low ph (4.63), high Al supply, low Mg and low P. The objective was to assess the relative advantages of the use of acid tolerant maize (Zea mays L.) cultivars compared to the use of fertilizers and organic manure to correct soil acidity. On acid soil, maize grain yield of the soil acidity-tolerant cultivar ATP-SR-Y was 61% higher compared to the sensitive cultivar Tuxpeño Sequia. The application of 60 kgha-1 of P yearly for 3 consecutive years did not significantly increase the grain yield of the acidity-tolerant cultivar. Lime except in the first year resulted in a significant increase in grain yield of both the tolerant (82%) and particularly the susceptible cultivar (208%). This corresponded to a significant decrease in exchangeable Al and to a significant increase in pH and available Ca and Mg contents of the soil. The application of chicken manure or green manure (Senna septabilis leaves) significantly increased maize grain yield. These increases were partly attributed to an increase of available Ca and P of the soil for chicken manure application and to a decrease of exchangeable Al and a small increase in pH and Mg for Senna septabilis leaves application. It was concluded that the best correction factor was lime. However, organic amendments which are within reach of small farmers can at least substitute for lime application particularly for soil acidity- sensitive maize cultivars. Furthermore, the use of soil acidity-tolerant cultivars can greatly reduce the need for lime application and thus contribute to overall sustainability.
546			_aEnglish
591			_a0410|AGRIS 0401|AL-Maize Program
593			_aJuan Carlos Mendieta
595			_aCPC
650	1	0	_aAcid soils
650	1	0	_aAgricultural economics
650	1	0	_aChemical soil types
650	1	7	_aCropping systems _gAGROVOC _2 _91068
650	1	7	_aCultivation _gAGROVOC _2 _91071
650	1	7	_aMaize _gAGROVOC _2 _91173
650	1	7	_aSmall farms _gAGROVOC _2 _91260
653	0		_aCIMMYT
653	0		_aKARI
650	1	0	_91314 _aZea mays _gAGROVOC
700	1		_aCalba, H., _ecoaut.
700	1		_aFriesen, D.K.|Palmer, A.F.E. _eeds.
700	1		_aHorts, W.J., _ecoaut.
700	1		_aZonkeng, C., _ecoaut.
942			_cBK
999			_c7375 _d7375