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close this book Abstracts on sustainable agriculture 1992 Gate- GTZ
close this folder Abstracts on soil fertility
View the document Acknowledgements
View the document 1. Soil constraints on sustainable plant production in the tropics.
View the document 2. Impact of agricultural practices on soil pollution.
View the document 3. The use of organic biostimulants to help low input sustainable agriculture.
View the document 4. Nitrogen cycling in high-input versus reduced-input arable farming.
View the document 5. Green manure in rice farming.
View the document 6. Role of green manure in low-input farming in the humid tropics.
View the document 7. Green manuring with vetch on acid soil in the highland region of Rwanda.
View the document 8. Tropical lowland rice response to preceding crops, organic manures and nitrogen fertilizer.
View the document 9. Pearl millet and cowpea yields in sole and intercrop systems, and their after-effects on soil and crop productivity.
View the document 10. Influence of some characteristics of bean seed and seedlings on the tolerance to low phosphorus availability in the soil. (Infuencia de algunas caracteristicas de las semillas y plantulas de frijol Phaseolus vulgaris L. sobre la tolerancia a la baja disponibilidad de f├│sforo en el suelo )
View the document 11. Evaluation of diverse effects of phosphate application on legumes of arid areas.
View the document 12. Effect of n and p fertilizers on sustainability of pigeonpea and sorghum systems in sole and intercropping.
View the document 13. Efficient fertilizer use in acid upland soils of the humid tropics.
View the document 14. Vesicular-arbuscular mycorrhiza management.
View the document 15. Impact of tropical va mycorrhizae on growth promotion of cajanus cajan as influenced by p sources and p levels.
View the document 16. Benefit and cost analysis and phosphorus efficiency of va mycorrhizal fungi colonizations with sorghum (sorghum bicolor) genotypes grown at varied phosphorus levels.

14. Vesicular-arbuscular mycorrhiza management.

Publ. of GTZ, 6236 Eschborn, Postf. 5180, Germany, ISBN 3-88085-462-9, 1991, 371 pp., pbk

Increasing crop production and land productivity in the tropics is essential if the food demand of the growing population in these areas is to be met. Of all the soil-related constraints on crop production, low soil fertility is the most severe on more than half of the arable land in the tropics. Infertile soils are acidic and may be deficient in phosphorus, nitrogen and potassium. On these soils crop production can only be improved when fertilizers, in either organic or inorganic form, are applied, and when soil amendments are combined with improved crop production technologies. This is explained by Ewald Sieverding in his book Vesicular-Arbuscular Mycorrhiza Management, in which he describes the role these fungi can play in improving soil fertility.

The author explains that until about 20 years ago, vesicular-arbuscular mycorrhizal (VAM) fungi were virtually ignored by most soil and plant scientists. However, under controlled greenhouse conditions it has been demonstrated that VAM fungi increase phosphorus uptake. They also play a role in the uptake of other plant nutrients as well as in the biological nitrogen fixation of Rhizobium, the biological control of root pathogens, and the drought resistance of plants.

In 1980 a Mycorrhiza Special Project was initiated at the Centro Internacional de Agricultura Tropical (CIAT), in Cali, Colombia. The general objectives of this project were to test the agronomic importance of VAM in tropical crop production systems and to develop practical technologies to utilize VAM fungi as a biological resource to enhance phosphorus uptake and utilization.

Although the content of this book relates directly to South America, with particular reference to cassava, the principles of the VAM technology presented can be transferred to other crops and to conditions in tropical Africa and Asia, provided that the technology is adapted to the prevailing ecological and socio-economic conditions.

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Soil fertility

Germany, study, greenhouse conditions, mycorrhiza, pigeonpea, phosphorus fertilizer, plant growth

DIEDERICHS, C.