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Application of nitrogen-fixing systems in soil improvement and management

FAO Soils Bulletin No.49









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    China: azolla propagation and small-scale biogas technology. Report on an FAO/UNDP study tour to the People's Republic of China, 21 May - 11 June 1978
    FAO Soils Bulletin 41
    1978
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    The Study Tour was financed by the UNDP and had the following objectives. To gain knowledge and experience in: - The multiplication of Azolla as a source of biological nitrogen, particular attention being paid to propagation of Azolla and its protection form disease, insect damage and adverse climatic conditions. - Harvesting and agricultural use of Azolla. - Contruction of small-scale biogas units. - Management of biogas units and efficient use of the gas by farming communities and of the effluents for improving soil fertility
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    Blue-green algae for rice production. A manual for its promotion
    FAO Soils Bulletin No. 46
    1981
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    This manual is designed to give detailed, practical advice on the various methodologies of organic recycling. Blue-green algae form a self-sufficient system which is capable of fixing atmospheric nitrogen in organic forms and which grows upon a free water surface. It is thus ideally suited for propagation in rice fields. The development and use of blue-green algae require special techniques. The manual summarizes the present status of algal biofertilizer technology for rice with practical inform ation for its adoption by agricultural extension personnel and subject matter specialists. If properly extended, the technology holds the promise of providing 25-30 kg N/ha every season to the growing crop. It also holds the promise of generating rural income and employment. The ultimate success of the technology depends not only on creating an awareness but also on building a trained manpower reserve capable of applying the existing knowledge and carrying out further research.
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    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
    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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