This experiment was conducted to investigate the effect of the seeding time of silage corn before transplanting rice on the growth, green yield, the PH and organic matter content of soil after cutting in southern regions. 1. The plant height of silage corn sowed from March 27 (88days for the period of vegetation) to April 1(83 days for the period of vegetation) was superior to that sowed after April 26(58 days for the period of vegetation) and there were significant differences (P $lt;0.01) among the seeding times. 2. In the seeding time, the earlier silage corn sowed, the higher the rate of stem to leaf was, but the later the silage corned sowed, the higher the rate of leaf to stem was. 3. In the fresh yield, the growth of silage corn sowed on March was superior to that sowed after the middle of April because of the long period of vegetation and it can be suggested that the period of vegetation increased the growth and yield of silage corn be apt to 68 to 88 days. 4. In the dry matter yield, there were significant differences (P $lt; 0.01) among the seeding times (the period of vegetation). 5. In the organic matter content of soil, the earlier the seeding time was, the less the organic matter content was, but that of soil sowed April 16 was similar to that after fertilization.