| Soybean is one of China’s major food crops. Soybean requires large amounts of water in growth period. The water is very important for the growth and development of soybean.The work was conducted in the Northeast Agricultural University experiments internship base in2013. The soybeans of test inculde HN44and HN65. Adopted periodic drought treatments at different growth stages of soybean and water treatments of different levels of irrigation in whole soybean growth period. The effect of water treatment on soybean plant height, dry matter accumulation and yield were studied, while analyzing soil moisture variation. The results showed that:The trend of soil moisture changed in the exponent attenuation with periodic droughts lasted longer. The soil moisture was largest in the initial moments of drought treatments. The soil moisture decreased gradually and slowly to flatten with the increase in the number of days of drought.Time series model of soil moisture content in seedling, flowering-podding and podding-seed filling period were S=24.93e-0007T, S=22.16e-0012T, S=23.47e-0007T, R2were0.973,0.842,0.943, which was significantly tested.The effect of irrigations on soil moisture during the soybean growth was significant. With the increase in irrigation, soil moisture showed upward trend. M50soil moisture was the lowest, soil moisture increased insignificantly after irrigated, fluctuation was small. M150and M175soil moisture were higher than the others, soil moisture increased significantly after irrigated, fluctuation was large. M75, M100and M125soil moisture changed closely.Periodic drought reduced plant height significantly in seedling and flowering-podding period. Periodic drought in seedling mainly inhibited the growth of high section in HN44and low section in HN65; The longer drought treatment reduced the length of6-13section significantly in flowering-podding period. The compensation effect of rewatering on length of section was obvious. Soybean plant height was increasing with increase of irrigation.Height of HN44was the highest at levels of125%, height of HN65was the highest at levels of175%caused the increase in the length of the high section.The effect of periodic drought and irrigations on dry matter accumulation was significant. In the seedling, flowering-podding and podding-seed filling period, dry matter accumulation decreased with the increase in number of days of drought. Rehydration after the end of the drought treatment, compensation effect of drought lasted shorter was significant.And the ability to compensate was limited in the lasted longer treatment of drought. Effects of different levels of irrigation on dry matter accumulation due to soybean varieties. HN44dry matter accumulation showed a decreasing trend after increasing with the increase amount of irrigation, dry matter accumulation was the largest at irrigation level of125%.HN65dry matter accumulation showed a increasing trend with the increase amount of irrigation, dry matter accumulation was the largest at irrigation level of175%.The effect of different drought duration and irrigations on soybean yield was significant. In the seedling, flowering-podding and podding-seed filling period, the yield of soybean decreased with the increase in number of days of drought. HN65soybean production reduced significantly in the flowering-podding period, HN44soybean production reduced significantly in the podding-seed filling period. The yields of HN44and HN65showed an increasing trend with the increase of irrigation, the yield was largest in the level of175%. |
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