Method 3 Rice-rice-milk vetch rotation system

Chinese milk vetch (Astragalus sinicus L.) is an important green manure used in paddy fields in southern China (Fig. 3.1). The milk vetch seed is sowed when second season rice is in the ripening stage and the field is drained. The over-wintered milk vetch grows steadily in spring. During the flowering state, milk vetch is ploughed, turned down and covered with soil for decomposition before the early season rice is planted. It can help to increase soil fertility and improve paddy field quality. Nitrogen fixing by milk vetch can support the growth of the rice crop.

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