集雨补灌对粮饲兼用玉米的产量及生理效应研究

Studies on yield and physiological effect of grain and forage corn under supplementary irrigation with catchment rainfall

试验结果表明 ,陇中旱地集雨补灌能明显提高粮饲兼用玉米的水分利用效率 ,且对产量具有补偿效应 ,其效应大小为 :大喇叭口期 >大喇叭口期 +拔节期 >拔节期 ,高水补灌优于低水补灌。相关分析表明 ,补灌条件下粮饲兼用玉米增产 ,主要原因是增加了穗长和穗粗 ,提高了穗重和粒重 ,减小了秃顶 ;补灌改善了玉米叶片的生理活性 ,叶绿素含量提高 ,单叶光合速率增加 ;产量与叶绿素含量。

The results of experiment showed that it had improved the level of yield and water use efficiency(WUE) of grain and forage corn under supplementary irrigation with catchment rainfall in semi arid area. The order of yield effect for supplementary irrigation was the big horn stage>jointing+ big horn stage>jointing. And under supplementary irrigation ,the length and the width of grain and forage corn ears were increased. In addition, supplementary irrigation ameliorated physiological properties of grain and forage corn; Compared to control, the content of chlorophyll and the photosynthesis rate of blades were risen.