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通过在固海扬水灌区进行的四种作物(玉米、油葵、春小麦、大麦)6种水质(黄河淡水、1.0g/L、1.5g/L、2.0g/L、2.5g/L和3.0g/L)处理,3次重复共计72个小区的灌溉试验结果表明:四种作物均可采用黄河淡水与地表咸水掺混灌溉,且混合水矿化度在小于3.0g/L时四种作物均能安全生长。通过四种作物的产量性状及生育动态进一步分析得出,春小麦、玉米混合水灌溉,安全丰产的灌溉水矿化度在2.0g/L以下,大麦、油葵安全丰产的灌溉水矿化度在2.5g/L以下。土壤盐分会因灌溉水的矿化度增高而升高,但冬灌利用黄河淡水轮灌洗盐,土壤积盐与脱盐水平相当,且第二年春季基本不存在返盐现象。
Six kinds of water quality (yellow river freshwater, 1.0g / L, 1.5g / L, 2.0g / L, 2.5g / L and 3.0g) were obtained from four crops (corn, sunflower, spring wheat and barley) / L). The results of irrigation experiments in a total of 72 plots in three replications showed that all the four crops could be irrigated by freshwater from the Yellow River and surface saline water. When the salinity of mixed water was less than 3.0 g / L, the four crops Can grow safely. Through further analysis of the yield characters and growth dynamics of the four crops, it is concluded that the salinity of irrigated water with safe and high yield is less than 2.0g / L under the irrigation of mixed wheat and corn, the salinity of irrigation water with safe and productive barley and sunflower is 2.5g / L or less. Soil salinity will increase due to the increase of salinity of irrigation water. However, salt irrigation with Yellow River freshwater wheel in winter irrigation has the same level of soil salt accumulation and desalination, and there is almost no salt return in the next spring.