Summary of results and experiments from on-station and on-farm testing and development of conservation tillage systems in semi-arid Masvingo
1995
Chuma, E. | Hagmann, J. (AGRITEX/GTZ Conservation Tillage Project, Masvingo (Zimbabwe). Makoholi Research Station)
The Conservatiuon Tillage for Sustainable Crop Production Systems has been testing and developing conservation tillage systems in the semi-arid areas of Masvingo Province since 1988. A dual approach of on-station research and adaptive on-farm research has been taken. Out of five tillage techniques, only mulch ripping can be considered ecologically sustainable. No-till tied ridging follows closely due to its perfect soil and water conservation effect. Two other minimum tillage systems, hand-hoeing and clean ripping are to reduce soil loss as compared to conventional mouldboard ploughing, but their level of soil loss is still above tolerable levels. Perfomance of the different tillage techniques has proved to be highly variable depending on soil, site and farmer specific conditions. To address the problem of high variability of conditions it was concluded that different techniques and systems should be promoted as options rather than blanket recommendations and that farmers should be encouraged to select, test and experiment with options in order to adapt technologies to their specific needs and conditions. The paper concludes that conservation tillage alone without further aspects of crop husbandry and soil fertility can only result in minor yield increases and does not necessarily increase the sustainability of the crop production system. Extension and further research should focus on integrated approach for land husbandry.
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