咸水非充分灌溉对土壤盐分动态及制种玉米产量的影响

通过田间试验,研究了咸水非充分灌溉下土壤盐分动态及其对制种玉米产量和水分利用效率的影响。结果表明,玉米播种前至收获后土壤盐分主要累积在中层土壤,尤其是灌水量越大的处理;灌水阶段,表层土壤脱盐量随着灌水量增加而增大;土壤蒸发阶段,灌水量大的处理表层土壤盐分累积明显。灌溉水量控制在390mm左右且灌水矿化度不超过3g/L,减产幅度较低且节水。

Effects of Deficit Irrigation with Saline Water on Soil Salt Dynamic in Profile and Yield of Seed Maize

Field experiments were conducted to study the effects of deficit irrigation with saline water on the soil salt dynamic in profile,yield and water use efficiency of seed maize in Shiyang River Basin.The results showed that the salt was mainly accumulated in the middle soil layer from sowing to harvest of seed maize,especially the treatment with the greater irrigation water amount;The desalination of the surface was enhanced with the increase of irrigation water amount in the period of irrigation while salt was evidently accumulated in surface soil for the treatment with the larger irrigation water amount in the period of evaporation.Irrigation mode with irrigation water amount of about 390mm and the irrigation water mineralization below 3g/L is recommended as a result of saving water and the yield decreasing slightly.