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采用盆栽模拟干旱环境设置不同钾肥处理,于开花期测定黑农44大豆叶片保护酶(SOD,CAT,POD)活性,以明确钾对大豆抗旱生理的影响。结果表明:适量施入钾肥可以提高大豆叶片保护酶活性。其中,K3处理(K2O 0.42 g.kg-1土)的酶活性增加值最多。SOD,CAT活性在抵御轻度干旱胁迫时发挥着重要作用,而在重度胁迫时POD活性作用更大。轻度和中度干旱条件下大豆产量和产量构成因素随着施钾量的增加而增加,产量增幅为3.8%~18.6%。而在重度胁迫下施钾无增产作用。
Different potassium treatments were set up in a simulated drought environment in pots. The activities of protective enzymes (SOD, CAT, POD) in leaves of Heinong 44 were measured at the flowering stage to clarify the effect of potassium on the drought resistance of soybean. The results showed that proper amount of potash fertilizer could increase the protective enzyme activity of soybean leaves. Among them, K3 treatment (K2O 0.42 g.kg-1 soil) increased the maximum value of enzyme activity. The activity of SOD and CAT played an important role in resisting mild drought stress, while the activity of POD was greater in severe stress. Under mild and moderate drought conditions, the yield and yield components of soybean increased with the increase of potassium application, and the yield increased by 3.8% ~ 18.6%. Under the severe stress, no potassium was added to increase yield.