Plant crops used as manure for other crops, especially nitrogen fixing properties to replace chemical fertilizer. In the United States, winter cover crops are quite common, such as rye grass.

In the tropics, Sesbania rostrata has been introduced as green manure crop before rainy season rice in the rice soybean system. The legume is broadcasted in mid May and incorporated into soil after 55-60 days. Rice is then transplanted 7-10 days after Sesbania incorporation. The on-station studies and on-farm participatory experimentation show convincing results of increasing rice yield over 20%, which is equivalent to yield obtained by applying 54 kgN/ha. After two years of farmer participation, the area planted to Sesbania rostrata in the test site as green manure crop has been increased three folds.

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