地下滴灌埋管深度对冬小麦根冠生长及水分利用效率的影响

Effect of Lateral Depth on Root and Seedling Growth and Water Use Efficiency of Winter Wheat

在试验室内 ,进行了地下滴灌埋管深度对不同生育时期冬小麦根系生长和地上部分生长影响的试验研究。结果表明 :2 0 cm和 4 0 cm埋管深度的水分分布特征 ,在生育早期抑制地上部分营养生长 ,促进冬小麦蹲苗 ;而中后期则促进生殖生长 ,产量和水分利用效率较高。不考虑犁底层影响时 ,在重壤土上 4 0

Under subsurface drip irrigation condition, the experiment was carried out, on the effect of lateral depth on the root and seedling growth of winter wheat in different growing stages. The results showed: the soil moisture distribution with the lateral depth of 20 cm and 40 cm,inhibited the seedling vegetative growth and spur the root to stretch in deeper soil in early stage,but promoted reproductive growth in later stage, and raised water use efficiency. The optimal lateral depth was 40 cm, disconsidering the hard soil layer under the tillage layer.