膜下滴灌灌水周期对盐渍化土壤水盐运移影响研究

Influence of Irrigation Frequency of Drip Irrigation under Mulch on Soil Water-Salt Transport of Salinization Soil

通过盐渍化土壤棉花膜下滴灌大田试验,研究了灌水周期对盐渍化土壤水盐运移和棉花产量的影响。结果表明,灌溉定额为4 200m3/hm2时,膜内0～60cm土层含水率以灌溉周期7d最高,5d次之,3d最小;且灌溉周期7d时,可有效降低湿润体土壤含盐量,有效抑制土壤返盐。灌水周期对棉花产量有显著影响,灌溉周期为7d时,棉花产量最高。

A cotton field experiment under mulched drip irrigation of soil salinization was carried out in or- der to study the effects of different irrigation frequencies on soil water-salt transport of salinization soil and cotton yield. The results showed that the moisture content with irrigation frequency for 7 days was the highest , and the lowest was appeared with irrigation frequency for 3 days in soil layers of 0-60 cm; soil salinity was reduced effectively with irrigation frequency for 7 days, which could effectively control the up- rise of soil salt. The irrigation frequency had a significant influence on cotton yield, and the highest yield was obtained under irrigation frequent for 7 days.