Abstract: In order to investigate the effects of sowing date on growth and development, yield and utilization of temperature and light resources, determine appropriate direct seeding date of “Si Te” late Indica rice, a field experiment was carried out with 5 sowing dates and 4 “Si Te” late Indica rice materials. The results showed that the yield of “Si Te” late Indica rice was decreased with sowing date delay, and the main reason was that the total grain number per panicle decreased significantly with sowing date delay. Unless sowed on July 10, full heading could be safely achieved under other sowing dates. Temperature and light resources utilization rate of whole growth period were the highest on sowing date of June 20, and the lowest on June 30 or July 5. In consideration of yield, temperature and light resource utilization, security full heading and mature, June 20 is the best sowing date of “Si Te” late Indica rice, but considering crop arrangement and farming operation, the latest sowing date is July 5 of “Si Te” late Indica rice.

Key words: "Si Te" late Indica rice, sowing date, yield, temperature and light resources