To explore the effects of soil water potential at grain fillingmilky stage on rice yield and physiological traits in salinealkali soil, we measured grain yield, dry matter production, leaf physiological traits and leaf area under soil water potentials of 0kPa(WP0), -15 kPa(WP-15),-30 kPa(WP-30) and CK (continuously flooded).The results showed that yield of rice differed significantly under different soil water potentials, being the highest under WP0, while being the lowest under WP-30.Compared with the CK, WP-15 and WP-30, rice grain yield under WP0 increased by 403%, 19.90 % and 26.05 %, respectively and the increased 1000grain weight and seed setting percentage may contribute to its higher grain yield. The root dry matter production under WP0 was significantly higher than that under CK at grain fillingmilky stage. The dry matter accumulation of root and abroveground part under WP0 were significantly higher than those under CK , WP-15 and WP-30 after 15 days of rewatering. With the decreasing soil water potential, the leaf relative water content and leaf area index decreased with insignificant difference. The content of proline and electrical conductivity under CK were significantly lower than those under WP0, WP-15 and , WP-30. The chlorophyll contents showed a trend of WP0>CK> WP-15> WP-30. The 1000grain weight, seed setting percentage, root activity, dry matter production and chlorophyll contents of rice in soda alkalisaline soil increased under moist irrigation at the grain fillingmilky stage, so in soda alkalisaline soil continuously flooded irrigation is not necessary. Moist irrigation method could improve not only rice yield ,but also water resourceuse efficiency.
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