A field experiment was conducted to investigate the effects of different drainage times during yellow ripening stage of rice on soil salt contents, Na contents in rice shoot, and rice grain yields on a coastal saline soil in Zhejiang province. The results showed that during yellow ripening stage of rice, the soil salt contents increased with soil depth. After drainage, salt contents in 0 - 80 cm soil depth showed a rising trend, which was resulted from the earlier drainage. However, change in salt contents in 80 -100 cm depth was not great. Na contents in shoots of rice in earlier drainage treatment were higher than that in later drainage treatments. Compared to the treatment of conventional drainage time ( October 7th) , rice grain yield in the treatment of advancing drainage for 12 days decreased by 8. 2% . Rice grain yield in treatment of delaying drainage for 14 days increased by 18% , and number of filled grains per panicle and grain weight of rice also significantly increased. However, there was no significant difference in rice grain yields between the treatments of delaying drainage for 29 d and 14 d. Therefore, delaying drainage for 14 days during yellow ripening stage of rice was an effective way to conform the stable yield of rice on a coastal saline soil.%在浙江上虞涂区研究了水稻黄熟期不同排水时间对1m土层盐分含量、水稻地上部Na含量及水稻产量的影响.结果表明:该时期的稻田土层盐分含量随土层深度的增加而增加.水稻黄熟期排水后,0～80cm土层中盐分含量呈上升的趋势,且排水越早,土层中盐分含量上升的幅度越大,但80～100cm土层盐分含量变化不显著.黄熟期水稻地上部Na含量随时间的推移而逐渐增高,且排水越早,水稻地上部Na含量增幅越大.以当地常规排水时间(10月7日)为对照,提前排水12d,水稻产量下降8.2％,而延期排水14d则可使水稻产量提高18％,同时千粒重和水稻穗实粒数也显著提高,但延期排水29d与延期排水14d相比,水稻产量并未显著增加.由此可见,滨海涂区水稻黄熟期延期排水14d可作为保证水稻稳产的有效技术措施之一.
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