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Small Dams and Weirs in Earth and Gabion Materials









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    NRM Research in the CGIAR: Background Papers Considered by TAC/iSC 2003
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    Arid zone forestry 1992
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    In the late 1970s end early 1980s, forestry in arid zones tended to concentrate on the establishment of large-scale plantations of exotic species, aimed exclusively at timber or fuelwood production. To do this, large areas of the "useless brush" on which local people depended for fuel, food and fodder have been cleared. In the development of agricultural schemes or irrigation projects, natural tree formations have often been eliminated, leading to increased erosion and subsequent losses in produ ctivity and shortened life spans of reservoirs. However, although the overall trend is still unsatisfactory, there is growing evidence of a change in thinking on the part of foresters and land-use managers concerned with arid zones. This issue of Unasylva evidences this change in perspective as well as the positive results that may be obtained as a consequence.
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    Organic recycling in Africa. Papers presented at the FAO/SIDA Workshop on the Use of Organic Materials as Fertilizers in Africa, Buea, Cameroon, 5-14 December 1977
    FAO Soils Bulletin 43
    1980
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    Policy makers as well as scientists have started to acquire an honest appreciation of the possibilities of reducing the wastage of materials which could be profitably utilized for improving or maintaining soil productivity. In addition, the great opportunities offered by making more efficient use of the potentials of biological nitrogen fixation in farming systems are now fully recognized. A number of recommendations and suggested guidelines were made by the various Working Groups during the t wo-week Workshop. These covered: 1- Cropping systems and crop residue management 2- Biological N-fixation 3- Research, training and extension. A central theme much emphasized at the Workshop was the fact that agricultural policy makers, technicians and scientists need to study more closely the basic practices of the small farmers so that proposal for the introduction of new systems could be easily understood, integrated and accepted by these farmers.

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