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在河北省黄骅中捷农场进行矿化度为3 g/L的海冰水膜下灌溉试验,研究不同灌溉处理对土壤水分含量、盐分积累、棉花生长发育、产量及水分利用效率的影响。结果表明,与井水灌溉相比,海冰水灌溉可以增加土体的中下层土壤含水量。海冰水灌溉会引起土壤表层盐分含量的增加,但经过雨季水分的淋洗作用,盐分会得到很大程度的淋溶,因此,在棉花生长后期2种不同灌溉水源处理,土壤各层次盐分含量无显著差异,井水灌溉棉花产量略高于海冰水灌溉,但二者之间产量及产量构成指标差异不显著。海冰水膜下滴灌与漫灌相比,可以显著提高棉花产量和灌溉水利用效率,其中产量提高22%。研究结果表明,矿化度为3 g/L的海冰水可以用于棉田灌溉,结合膜下滴灌技术可以有效提高灌溉水的利用效率。
The irrigation experiment of sea ice under salinity of 3 g / L was conducted in Zhongjie Farm, Huanghua, Hebei Province to study the effects of different irrigation treatments on soil moisture content, salt accumulation, cotton growth, yield and water use efficiency. The results show that, compared with well water irrigation, sea ice water irrigation can increase the soil moisture in the middle and lower soil. Sea ice water irrigation can cause the salt content of the soil surface to increase, but after the rainwater leaching, the salt will be a large degree of leaching. Therefore, two different irrigation water sources in the late cotton growth stage, the soil salt content There was no significant difference. Yield of well water irrigation cotton was slightly higher than that of sea ice water irrigation, but there was no significant difference in yield and yield components between the two. Compared with flooding, the drip irrigation under sea ice and water could significantly increase cotton yield and irrigation water use efficiency, with the yield increased by 22%. The results show that sea ice with salinity of 3 g / L can be used to irrigate cotton fields. Combined with drip irrigation, the efficiency of irrigation water can be effectively improved.