防雨条件下控灌对冬小麦土壤含水量的影响

EFFECT OF CONTROLLING IRRIGATION ON SOIL WATER CONTENT UNDER RAIN-PROOF SHELTER

利用遮雨棚研究了控灌对土壤含水量的影响。结果表明，灌水量越少，土壤各土层含水量越低，土层间含水量差异越大。灌水量越大，各层土壤含水量提高，并随土层深度增加，土层间含水量差异减少。只浇拔节水的处理，收获时０～０．６０ｍ土层的土壤含水量接近有效水低限值。本试验条件下冬小麦能有效地利用１．８０ｍ以上的土壤水分。

The experiment was conducted under controlling condition and the results are as follows:The smaller the amount of water irrigated, the lower the soil water contents and the larger the changes of soil water content in each soil layer were.The soil water content increased along the depth of the soil profile.The soil water content reached its lowest limit available to winter wheat in the soil from surface to the depth of 0.60 M in the soil profile,if the water was irrigated at node enlongation stage only.The depth of soil water available to wheat was 1.80 M under our experiment condition.