咸水灌溉下制种玉米水分利用效率的研究

为了探究石羊河流域地下咸水资源的利用方式,在西北干旱区的石羊河流域开展了咸水灌溉田间试验,通过测定土壤含水率和制种玉米产量指标,研究咸水灌溉对制种玉米耗水量、产量、水分利用效率和灌溉水分利用效率的影响.研究结果表明:在相同灌溉水量条件下,不同灌水矿化度对制种玉米的耗水量影响不明显;随着灌水矿化度的增加,制种玉米的产量逐渐降低,3 g/L的微咸水灌溉与淡水灌溉相比,减产幅度在20%以下,而9 g/L的高矿化度的咸水灌溉减产幅度在30%以上;水分利用效率和灌溉水分利用效率具有与产量类似的规律.因此,在研究区短时期采用3 g/L以下的微咸水进行灌溉,对制种玉米减产幅度、水分利用效率和灌溉水分利用效率的影响较小.

Research on water use efficiency of Seed Maize under Saline Water Irrigation

To explore the ways of using underground salt water resources in Shiyang River basin.A field experiment was conducted under saline water irrigation in Shiyang River basin of Northwest China.The soil water content and seed maize yield indicators were measured for study the effects of saline water irrigation on water consumption,yield,water use efficiency and irrigation water use efficiency.The research results showed that the effects of saline water irrigation on water consumption was not obvious under the same irrigation water quantity.With the increase of irrigation water salinity,seed maize yield gradually decreased.The salinity of 3 g/L brackish water irrigation reduced seed maize yield by below 20% and the salinity of 9 g/L salt water irrigation reduced seed maize yield by above 30% compared with fresh water irrigation.The water use efficiency and irrigation water use efficiency changed similarly to seed maize yield.The saline water irrigation with below 3 g/L is recommended as a result of water use efficiency and irrigation water use efficiency and the seed maize yield decreasing slightly in researching area.