棉花膜下滴灌条件下灌水频率对土壤水盐分布和棉花生长的影响

本文研究了棉花膜下滴灌在不同的土壤含盐量条件下灌溉周期对土壤水盐运动和棉花生长的影响。设置有以下处理：两种含盐量土壤，含盐量分别为0.08%和0.8%；两种灌水周期，即花铃期灌水周期分别为2d和6d；观测的内容有：土壤水分、盐分、棉花生长发育和产量。试验结果表明：在总灌水量相同的情况下，高含盐量土壤花铃期高频灌溉与低频灌溉相比，可以有效降低湿润体体内土壤盐分含量，并且得到了棉花增产28%的结果，而对于低盐土，灌溉频率对棉花生长和产量没有显著的影响。

Effect of mulched drip irrigation frequency on soil salt regime and cotton growth

The influence of application frequency of mulched drip irrigation on soil salt regime and cotton growth are experimentally study in field. Two kinds of soil with salinity level 0.08% and 0.8% are adopted. Two irrigation frequencies including once every 2 days and once every 6 days during the stage of blooming are to be considered. The spatial and temporal distributions of soil moisture and salt as well as the yield of cotton are recorded. The result shows that with the same amount of irrigated water, higher frequency irrigation effectively reduces the salinity of the soil containing higher salinity and elevates yield by 28%. While the frequency of irrigation will not significantly affect the growth and yield of cotton in soil containing lower salinity level.