000			03529nam a22004097a 4500
001			G91374
003			MX-TxCIM
005			20240508200200.0
008			240508s2009 ii ||||| |||| 00| 0 eng d
040			_aMX-TxCIM
041			_aeng
090			_aCIS-5477
100	1		_aVerhulst, N. _gFormerly Sustainable Intensification Program _gFormerly Integrated Development Program _gSustainable Agrifood Systems _8INT3307 _9916
245	1	4	_aThe importance of crop residue management in maintaning soil quality in zero tillage systems; a comparison between long-term trials in rainfed and irrigated wheat systems
260			_aNew Delhi (India) : _b4th World Congress on Conservation Agriculture, _c2009.
340			_aPrinted Computer File
520			_aCIMMYT is committed to improving livelihoods in developing countries by improving the productivity and profitability of farming systems while sustaining natural resources. This paper focuses on the influence of crop residue management on soil quality in zero till systems and includes results from two long-term trials established in the early 1990?s in different agro-ecological systems in Mexico: (1) a low-input, semi-arid, rainfed system in the rainfed central highlands (2240 masl) with zero tillage on the flat and (2) a high-input, arid, irrigated system in the northwestern part of the country with zero tilled permanent raised beds. In both zero till systems, the (partial) retention of the crop residues was necessary to maintain soil quality. In the rainfed semi-arid zero tillage system, mean weight diameter obtained by dry sieving, aggregate stability, infiltration, soil moisture content, soil microbial biomass and nutrient status were lower with residue removal than with residue retention. In the irrigated permanent raised bed system, burning of all crop residues resulted in a degradation of soil structure, lower direct infiltration, irrigation efficiency, soil moisture content, soil microbial biomass, lower total N and greater soil sodicity as compared to retaining crop residue at the surface. Practices with partial retention of crop residue showed soil quality similar to practices with retention of all residues. The retention of at least part of the crop residue is essential for the sustainability of zero till systems, although it may be possible to remove part of the residue for other uses, especially in irrigated conditions where biomass production is high.
536			_aConservation Agriculture Program
546			_aText in English
591			_a0903|Berta
594			_aINT2813|INT3307|CSAY01
650		7	_aZero tillage _2AGROVOC _91753
650		7	_aRaised beds _2AGROVOC _926289
650		7	_aCrop residue management _2AGROVOC _931822
650		7	_aSoil quality _91270 _2AGROVOC
653	0		_aCIMMYT
700	1		_aGovaerts, B. _gSustainable Intensification Program _gIntegrated Development Program _gDG's Office _8INT2813 _9860
700	1		_aVerachtert, E. _915858
700	1		_aKienle, F. _95238
700	1		_aLimon-Ortega, A. _915808
700	1		_aDeckers, J. _965
700	1		_aRaes, D. _921147
700	1		_aSayre, K.D. _8CSAY01 _94612 _gSustainable Intensification Program
711	2		_928220 _aWorld Congress on Conservation Agriculture _n(4th : _d4-7 February 2009 : _cNew Delhi, India)
773	0		_dNew Delhi (India) : 4th World Congress on Conservation Agriculture, 2009. _gp. 71-79 _tWorld Congress on Conservation Agriculture; 4: Innovations for improving efficiency, equity and environment _wG91363
942			_cCPA _2ddc _n0
999			_c6259 _d6259