论文部分内容阅读
汾河灌区地面灌溉水源严重短缺，影响着灌区农业生产发展。但灌区内存在着大量未开发的浅层咸水资源，这部分水资源属于劣质高矿化度水。为了利用这部分水源进行农田灌溉，对其进行了试验研究。研究表明：盐分对作物的危害及对产量的影响小于水分，因此，要首先保证作物的需水要求；利用成水灌溉，只要控制土壤含盐量、水分、相对溶液浓度指标不超过作物耐盐限度，就可以保证农业增产；试验冬小麦、春玉米、棉花用咸水灌溉分别比不灌溉的旱作物增产60．0％、33．7％、30．2％；要想进一步提高作物产量，须根据水源情况，实行咸、淡水轮灌；在每年有一次大定额河水灌溉和地下水有一定的径流条件下，用咸水灌溉，不会使土体长期积盐。
Fenhe irrigation area on the ground a serious shortage of water supply, affecting the irrigation development of agricultural production. However, there is a large amount of undeveloped shallow salt water resources in the irrigation area, which belongs to low-grade and high-salinity water. In order to use this part of the water for farmland irrigation, its experimental study. The results showed that the harm of salt to crop and its impact on yield were less than that of water. Therefore, the requirement of crop water requirement should be ensured firstly. When using water for irrigation, as long as soil salinity control, soil water content and relative solution concentration did not exceed the salt tolerance The yield of agriculture can be guaranteed; the yield of winter wheat, spring maize and cotton with salt water irrigation increased by 60.0%, 33.7% and 30.2% respectively compared with the non-irrigated dry crops; in order to further increase the crop yield, According to the situation of the water source, salty and fresh-water irrigation shall be carried out. If there is a large-scale annual runoff irrigation and groundwater runoff, irrigating with saline water will not cause the soil to accumulate salt for a long time.