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为揭示滴水量对超高产大豆根系生长的影响规律,设置975 m3·hm-2(W1)、1 575 m3·hm-2(W2)、2175 m3·hm-2(W3)、2 775 m3·hm-2(W4)4种滴水处理,对各处理0~100 cm土层含水量、新大豆27号根系干重、侧根长和产量进行测定分析。结果表明:随着滴水量的增加,0~40 cm土层的含水量增加;0~20 cm土层根干重密度和侧根长密度增幅最大,20~40 cm土层增幅其次;增加生育中后期0~80 cm土层总根干重和总侧根长,鼓粒初期W2、W3、W4处理的根干重分别较W1增加14.2%、30.4%、41.1%,侧根长分别较W1增加17.4%、25.7%、40.3%;提高0~40 cm土层根系活力,增加根系伤流量,提高水分利用效率,W3、W4鼓粒初期0~80 cm土层根干重分别为88.6、95.8 g·m-2,侧根长为432.4~482.9 m·m-2,产量分别为6 082.6 kg·hm-2、6 404.7 kg·hm-2,水分利用效率为1.30左右。新疆伊宁地区大豆的适宜滴水量为2 175~2 775 m3·hm-2。
In order to reveal the effect of drip rate on the root growth of ultra-high yield soybean, 975 m3 · hm-2 W1, 1575 m3 · hm-2 (W2), 2175 m3 · hm-2 hm-2 (W4). The water content of 0-100 cm soil layer in each treatment, the dry weight, lateral root length and yield of new soybean No.27 were measured and analyzed. The results showed that the water content of 0-40 cm soil layer increased with the drip irrigation amount increasing. The root dry weight density and lateral root length density increased most significantly in 0-20 cm soil layer, followed by 20-40 cm soil layer, The total root dry weight, total lateral root length and W2, W3 and W4 in late 0-80 cm soil layer increased by 14.2%, 30.4% and 41.1%, respectively, and the lateral root length increased by 17.4% , 25.7% and 40.3% respectively. The root activity of 0-40 cm soil layer was increased, the root trauma volume was increased and the water use efficiency was increased. The root dry weights of 0 ~ 80 cm soil layers of W3 and W4 were 88.6 and 95.8 g · m -2, the lateral root length was 432.4 ~ 482.9 m · m-2, the yield was 6 082.6 kg · hm-2,6 404.7 kg · hm-2, and the water use efficiency was about 1.30. The suitable drip rate of soybean in Yining, Xinjiang is 2 175 ~ 2775 m3 · hm-2.