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磷素(P)是提高植物抗水分胁迫能力的重要因子。选取大豆(Glycine maxL.Merrill)品种东农434进行盆栽试验,分别在大豆R1期(初花期)和R4期(盛荚期)进行干旱胁迫处理,解析P在干旱胁迫条件下对根系性状和产量的影响。试验设置4个施P水平,即0、7.3、14.6和29.2 mgkg-1。3个水份处理,即(1)全生育期维持田间持水量(FWC)的65%～75%为对照;(2)R1期控水为FWC的30%～40%;(3)R4期控水为FWC的30%～40%。结果表明,两个时期的干旱胁迫均显著影响根系性状,降低产量,且R4期比R1期严重。磷素营养显著改善干旱胁迫所引起的不利影响,增加根干重、根长、根表面积,进而减少大豆产量的损失。
Phosphorus (P) is an important factor to improve the ability of plants to resist water stress. A pot experiment was conducted in Dongnong 434, a soybean (Glycine max L. Merrill) cultivar. The effects of drought stress on the root traits and yield of P under drought stress were studied in R1 (flowering stage) and R4 Impact. In the experiment, four application levels of P were set at 0, 7.3, 14.6 and 29.2 mg kg-1. 3 treatments, namely (1) 65% -75% of FWC in whole growth period were controlled; ( 2) R1 control water is 30% ~ 40% of FWC; (3) R4 control water is 30% ~ 40% of FWC. The results showed that both drought stress significantly affected the root traits and decreased the yield, and the stage R4 was more serious than the stage R1. Phosphorus nutrition significantly improved the adverse effects of drought stress and increased the root dry weight, root length and root surface area, thus reducing the loss of soybean yield.