土壤盐分与灌溉水质对滴灌棉花出苗率的影响

Impacts of Water Quality and Initial Soil Salt Content on Seedling Emergence of Cotton under Drip Irrigation

试验研究了灌溉水质与土壤初始含盐率对滴灌棉花出苗率的影响。试验结果表明,土壤不含盐时,灌溉水质对内行棉花出苗率影响不显著,对外行棉花出苗率影响显著;自来水处理的内行与外行棉花出苗率均大于微咸水处理;在4种微咸水中,EC小的水质对应的出苗率高,EC值相同时,SAR值小的内行出苗率高,SAR值大的外行出苗率高。当土壤含盐时,用微咸水灌溉更有利于棉花出苗;棉花的出苗率随土壤含盐率的增大而降低,土壤初始含盐率为0.8%与1.4%时,外行棉花出苗很困难。灌溉水的SAR值较大时,土壤初始含盐率对内行棉花出苗率的影响更大。

Base on the result of experiment,impacts of initial soil salt content and irrigation water quality on cotton seedling emergence under drip irrigation is analyzed.The results indicated that when soil is salt free,water quality affects outer row cotton emergence significantly,whereas the effect of water quality on inner row cotton emergence is not significant.The check treatments irrigated with tap water get the biggest value of inner and outer row emergence rate among all water quality levels.When irrigated with saline water,treatments receiving water with smaller EC value receive bigger emergence rate.When EC value is same,treatments irrigated with smaller SAR value get bigger inner row emergence rate,irrigated with bigger SAR value get bigger outer row emergence rate.Compared with high quality water,irrigated with saline water can enhance inner row cotton emergence when soil is saline.The emergence rate decreases with increasing soil salt content among all water quality levels.The outer row emergence rate of treatments with initial soil salt content of 0.8% and 1.4% is nearly 0.Effect of initial soil salt content on cotton emergence irrigated with high SAR value water is more significant than low SAR value.