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根据宁夏引黄灌区春玉米微咸水灌溉试验的数据结果,应用SWAP模型在田间尺度上对微咸水灌溉条件下春玉米田间土壤水盐运移规律和灌溉制度进行模拟,对拟定的各种灌溉方案进行评价。结果表明,率定与验证的SWAP模型可用于当地微咸水灌溉管理;25%降雨年型下,春玉米适宜灌水方案为生育期内灌2水(拔节水、抽雄水),灌溉定额为1200 m3/hm2;50%降雨年型下,春玉米适宜灌水方案为生育期内灌2水(拔节水、抽雄水),灌溉定额为1500 m3/hm2;75%降雨年型下,春玉米适宜灌水方案为生育期内灌3水(拔节水、抽雄水和灌浆水),灌溉定额为2400 m3/hm2。
According to the results of the experiment on brackish water of spring maize irrigation in irrigated area of Yellow River in Ningxia, the SWAP model was used to simulate the movement of soil water and salt and the irrigation system under the condition of brackish water irrigation on field scale. Irrigation program evaluation. The results showed that the SWAP model of rate determination and validation could be used for the local brackish water irrigation management. Under the 25% rainfall type, the suitable irrigation scheme of spring maize was 2 irrigation (jointing water and draft water) during the growth period and the irrigation quota was 1200 m3 / hm2. Under the 50% rainfall type, the suitable irrigation scheme for spring maize was irrigation of 2% water (jointing water and draft water) during the growing period, and the irrigation quota was 1500 m3 / hm2. The plan is to irrigate 3 water (jointing water, extracting water and grouting water) during the growth period and the irrigation quota is 2400 m3 / hm2.