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畦田灌水质量是影响作物产量和水分利用效率的重要因素。针对现有评价灌水质量存在工作量较大的问题,根据田间实测资料,利用SIRMOD模型、SRFR模型和田间实测方法分别计算灌水效率和灌水均匀度,结果表明根据较少的观测资料利用SIRMOD模型或SRFR模型也可对畦田灌水质量进行评价。根据模拟结果初步得出了在一定条件下单宽流量、平整精度和田面坡度对灌水质量的影响规律,并对不同规格畦田小麦全生育期的平均灌水质量对产量和水分利用效率的影响进行了分析,得出畦长45m,畦宽分别为5.0和7.5m的畦田在获得较高产量的条件下,水分利用效率由现状的1.10kg/m3分别提高到1.38kg/m3和1.35kg/m3,从田间试验角度论证了对灌区较大规格畦田进行缩块改造的必要性。
The quality of irrigation is an important factor affecting crop yield and water use efficiency. In view of the existing problems of large amount of workload in evaluating irrigation quality, the SIRMOD model, SRFR model and field measurement method were used to calculate the irrigation efficiency and irrigation uniformity according to the measured data in the field. The results show that the SIRMOD model or The SRFR model also evaluates the quality of irrigation in Qiongtian. According to the simulation results, the influence of single-wide flow, flatness and slope on the irrigation quality under certain conditions was preliminarily obtained. The effects of average irrigation quality on the yield and water use efficiency during the whole growth period were studied The results showed that the water use efficiency (WUE) increased from 1.10kg / m3 to 1.38kg / m3 and 1.35kg / m3 respectively under the condition of higher yield and higher plantation length of 45m and 畦 width of 5.0 and 7.5m respectively. From the perspective of field experiments, the necessity of shrinking blocks in larger size in Irrigation District was demonstrated.