土壤深层供水对冬小麦干物质生产的影响

Effect of water supply from deep soil on dry matter production of winter wheat.

采用根系研究装置研究了土壤深层供水对冬小麦干物质生产的影响 .结果表明 ,上层低湿度下层高湿度的处理在小麦灌浆期仍然保持了较高的土壤和叶片含水量 ,具有发达的根系 ,特别是 1m以下的根量在 4个处理中为最高 ,旗叶和穗的干重也最大 ,具有最大的产量潜力 .本研究表明 ,上层土壤较干下层土壤湿润有利于发挥小麦根信号的积极作用 ,平衡水分利用 ,同时通过对土壤水分的合理调节可以促进深层根的发育 ,有利于提高产量和水分利用效率 .

A root growth device was used to study the effect of water supply from deep soil on dry matter production of winter wheat. The results show that soil with high moisture in deeper layer and low moisture in upper layer (treatment LH) still maintains a higher water content both in soil and in plant leaf during the milking stage of wheat growth. This treatment gives the highest dry weight of roots, flag leaves and spikes, and hence, a maximum yield potential. It seems that such a soil moisture status is beneficial to promoting root development in deeper soil, balancing water utilization, and improving crop yield.