Abstract:

A study about the correlation between dry weight and plant nitrogen content of Astragalus sinicus L. after flowering periods were carried out, and the effect of Astragalus sinicus L. returning to field in maturity on soil fertility and yield of rice were studied. The results showed that: The wet weight and nitrogen content of Astragalus sinicus decreased from flowering to maturity stage, however, dry weight increased. By milk vetch returning to field in maturity, there was some loss of nitrogen than returning in flowering, however, it has more economic benefits due to tillage reducing and the seeds saving. The Astragalus sinicus can increase the organic matter content of field and rise the rice yield by returning to field in maturity.