硅肥不同喷施浓度对玉米抗倒伏性能及产量构成的调控效应

为探究硅肥不同喷施浓度对玉米抗倒伏性能及产量的调控效应,以先玉335为供试品种,比较分析灌浆期不同处理下玉米茎秆形态特征、基部节间力学特性及产量构成因素的差异变化。结果表明,叶面喷施硅肥对玉米株高、穗位高影响不明显,但可显著降低植株重心高度,以12 g/L浓度处理降幅最为显著,达6.02%;基部节间长度、扁平率则随着喷施硅肥浓度的加大而表现为逐渐下降趋势。喷施适宜浓度硅肥促进了茎秆机械强度的改善以及玉米倒伏发生风险的降低;叶面喷施适宜浓度的硅肥,对玉米产量和产量构成均有明显的促进作用。本试验条件下8~12 g/L为叶面硅肥最佳喷施浓度。

Regulating Effects of Different Silicon Fertilizer Concentrations for Foliar Application on Maize Lodging Resistance and Yield Components

In order to explore the effect of different silicon fertilizer concentrations for foliar application on the lodging resistance and grain yield of maize, Xianyu335 was used as the tested variety, the morphological characteristics, inter-node mechanical properties of stalk at filling stage and yield components at maturation period under different treatments were comparatively analyzed. The results showed that the effects of foliar application of silicon fertilizer on plant height and ear height were not obvious, but the height for the plant''s center of gravity was significantly reduced. Compared with CK treatment, height for the plant''s center of gravity of 12 g/L treatment was reduced by 6.02%, which was the most significant one among four concentrations of foliar silicon fertilizer. Length and oblateness of third internodes were gradually declined with the increase of spraying concentration of silicon fertilizer. Spraying the appropriate concentration of silicon fertilizer promoted the improvement of the mechanical strength of the stalk and reduced the risk of maize lodging. In this experiment, 8-12 g/L was the optimum spraying concentration of foliar silicon fertilizer.