Green Manure

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Organic Matter Decomposition Degradation of Plant Residues Humus Genera of Microorganisms Capable of Utilising Different Components of Organic Matter Humic Acids Beneficial Role of Humic Acids

Green Manure

Green Manure
The practice of green manuring of soil is as old as agriculture itself. Many leguminous and non-leguminous crops a e grown and turned into the soil while they are still green to enrich soil nitrogen. When organic matter is decomposed, the nitrogen bound in the organic matter is released first as ammonia. The ammonia may be absorbed by the plant or converted to nitrate. Apart from enrichment of soil nitrogen, green manuring enriches the phosphorus, calcium, sulphur and other mineral content of soil. The foliage of following crops are used in India for green leaf manuring:

Gliricidia maculata, Pongamia glabra, Calotropis gigantea, Tephrosia purpurea, T. candida, Indigofera teysmanni, Cassia tora, Sesbania speciosa and Ipomoea carnea. Many species of the following genera hold promise as potential green manure crops for rice cultivation: Aeschynomene, Cassia, Crotalaria, Cyamopsis, Desmodium, Indigofera, Lathyrus, Melilotus, Stizolobium, Phaseolus, Sesbania and Vigna.

The importance of stem nodulating Sesbania rostrata as a green manure plant in rice cultivation has already been mentioned in the chapter on Rhizobium and root nodulation.

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Mineralization and Immobilization Process Effects of Residues of Crops on Plant Growth Soil Sickness Composting Vermicomposting Green Manure Anaerobic Decomposition of Organic Matter Biogas Degradation of Hydrocarbons

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