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Book (stand-alone)Organic materials and soil productivity
FAO Soils Bulletin 35
1977Also available in:
No results found.In the temperate zones of the world a favourable balance exists between input and decomposition of organic materials in the soil. This balance is influenced by climatic conditions and the inorganic constituents of the soil, in which the amount and type of clay minerals play an important role. the plant growth caused by the use of mineral fertilizer increases not only the economically important parts of the plants, but also the growth roots and crop residues. Furthermore, in many farms animal exc reta is used to maintain the level of soil organic matter in arable land.There are some interactions between certain clay minerals and fractions of soil organic matter which act as favourable factors for soil productivity and for plant production. -
Book (stand-alone)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
1980Also available in:
No results found.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. -
Book (stand-alone)Application of nitrogen-fixing systems in soil improvement and management
FAO Soils Bulletin No.49
1982Also available in:
No results found.In view of the continuing increase in cost and scarcity of mineral fertilizers resulting from the use of high-cost fossil energy, there is renewed interest in organic recycling and biological nitrogen-fixation to improve soil fertility and productivity. The workshop in Alexandria recommended the further promotion of research, development, application and dissemination of information available on various aspects of biological nitrogen-fixation, including symbiotic systems of rhizobia/legume and Azolla/blue-green algae, and free-living nitrogen-fixing bacteria and blue-green algae. It is hoped that the compilation of various aspects of nitrogen-fixation under one cover in this Bulletin will be of interest and assistance to research workers and extension planners concerned with the further development and refinement of these natural systems for soil improvement and management.
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