Effects of Different Water Stress Potential at Ripening Stage on Rice Yield and Physiological Traits in Saline-alkali Soil

摘要

To explore the effects of different soil water potential of ripening stage on rice yield and physiological traits in saline-alkali soil, using four treatment levels of soil water potential of 0 kPa (H1: soil moisture), soil water potential of -15 kPa (H2), soil water potential of -30 kPa (H3), and CK (continuously flooded), a comparative study of different soil water potential of ripening stage on grain yield, dry matter production, and leaf physiological treats were conducted. The results showed that the soil water control of rice dough stage in the soda saline soil, grain yield showed the trend of A (OkPa) > CK (water layer), B (-15 kPa) > C (-30 kPa), A(0k Pa) compared with CK (water layer), B(-15kPa) and C(-30k Pa) were increased by 3.01%, 12.40%, 18.08%; total dry matter accumulation showed A (OkPa) > CK (water layer), B (-15kPa) > C (-30 kPa), A (0 kPa) is slightly higher than that of CK, no significant differences, A(0 kPa), CK(water layer) and B(-15k a), C (-30 kPa) reached a significant differences level (p<0.01); the increase of free proline content in leaves from high to low in the order of B > C > CK > A; the highest chlorophyll content was C, B content was the lowest, the chlorophyll content in the leaves was from high to low order C> CK > A> B; the highest level of LRWC was CK, the average of 49.65% for two years, the of LRWC for two years showed CK> A> B > C trend; The LAI trend of each treatment on September 10, September 15 and September 20 was basically the order of CK> A> B> C. The soda saline alkali soil rice dough stage field should be moisturizing state (OkPa).