A meta-analysis of long-term effects of conservation agriculture on maize grain yield under rain-fed conditions

• DOI: 10.1007/s13593-011-0040-2
• Publication Date: 2011-07-05T13:31:42Z
• Authors: Leonard Rusinamhodzi; Marc Corbeels; Mark T. van Wijk; Mariana C. Rufino; Justice Nyamangara; Kenneth E. Giller
• Keywords: Conservation Agriculture; Crop Rotation; Waterlogging (archaeology); Yield gap

Conservation agriculture involves reduced tillage, permanent soil cover and crop rotations to enhance fertility supply food from a dwindling land resource. Recently, conservation has been promoted in Southern Africa, mainly for maize-based farming systems. However, maize yields under rain-fed conditions are often variable. There is therefore need identify factors that influence yield conditions. Here, we studied grain data experiments lasting 5 years more We assessed the effect of long-term tillage residue retention on contrasting textures, nitrogen input climate. Yield variability was measured by stability analysis. Our results show an increase over time with practices include rotation high use low rainfall areas. But observed no difference system those strong relationship between annual rainfall. meta-analysis gave following findings: (1) 92% mulch areas leads lower due waterlogging; (2) 85% texture important temporal development effects, improved likely well-drained soils; (3) 73% require inputs especially N yield; (4) 63% increased obtained but calculations do not variations within seasons; (5) 56% semi-arid areas; (6) when adequate fertiliser available, most determinant southern Africa. It clear our needs be targeted adapted specific biophysical impact.