The use of green manure crop for sustainable agriculture can reduce the use of chemical fertilizer and herbicides, and the cultivation area of the green manure crop has gradually increased. However, there has been little information about appropriate use of spring-sown green manure crop in the central regions of Korea. This study was conducted to investigate the effect of different legume crops on application of sown green manure in spring. Each of the green manure crops including alfalfa, Chinese milk vetch, crimson clover, crotalaria, hairy vetch, lupin, red clover and white clover was grown in upland soil of silt loam. The dry weight and C/N ratio of all crops increased throughout the growing period, while C/N ratio of all crops during growing period was lower than 25. The highest value of dry weight among the green manure crops was observed in crimson clover, followed by red clover, lupin, Chinese milk vetch and alfalfa. Also, the highest value of contents of nitrogen, phosphous and potassium of green manure crops were observed in hairy vetch, alfalfa and crimson clover, respectively. And the values were 41.3, 4.3 and 35.9 g kg^-1, respectively. In terms of nitrogen yield, crimson clover that showed 71 kg N ha^-1 was the highest yield among the green manure crops, followed by Chinese milk vetch of 51 kg ha^-1, red clover of 46 kg ha^-1, and hairy vetch of 41 kg ha^-1. These results suggest that crimson clover, Chinese milk vetch, red clover, and hairy vetch could be a suitable green manure crop for spring sowing.