This paper examines those factors influencing the uptake and impact of renewable natural resource's research giving particular attention to the identification of promotion pathways, dissemination and adoption of soil and water conservation technologies suitable for small farmers in semi-arid parts of Zimbabwe. Problems faced by communal area farmers in these areas cannot be solved by simply adaption and introduction of already existing technologies. Apart from technologies for maize and cotton successfully developed for high potential areas, technology does not exist or inappropriate as it is perceived as too risky by farmers. To make research more effective more attention needs to be given to project identification, design and appraisal with active involmentand consultation with intended beneficiries and stakeholders usingmore participatory methods that consider socio-economic acceptability and identify dissemination pathways

Promotion of 'improved' conservation practiced in sub-Saharan Africa have rarely taken account of the practical, social and economic constraints faced by resource poor farmers. New technologies need to improve the supply and utilization of limited resources in these environments to satisfy the specific demands of the growing crop. At the same time they must not require costly inputs, unavailable skills or increase the demand on labour. Farmer uptake is therefore dependent upon the innovative use of existing implements, and thereby making the best use of what is generally available. This paper describes some of the lessons learned over the years and results from a five-year collaborative project between the Department of Research and Specialist Services (DRSS), Zimbabwe and Silsoe Research Institute, UK. The project aims to develop tillage systems that conserve water without increasing energy and labour requirements. Results of farmer managed trials sofar indicated that effective, low cost, conservation tillage practices can be achieved using existing implements to enhance water conservation, which will allow: i) earlier and more even crop establishment; ii) reduce effect of mid-season droughts and iii) extend the growing season where there is an early cut off to the rains. In order to identify whichh systems are appropriate and acceptable to dryland conditions, smallholder farmers have been fully involved in the selection and development of those technologies under investigation

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.