膜下滴灌棉田土壤水分消退规律分析与墒情预报

Laws of Soil Moisture Depletion & Its Forecast in Cotton Filed under Mulched Drip Irrigation in Xinjiang

为了探明合适的土壤墒情预报方法,给新疆棉花生产制订合理的灌溉方案,在研究土壤含水率与土壤消退量比例关系的前提下,分析了北疆棉田土壤水分的动态消退规律,并对水分的消退系数进行了曲线拟合。结果表明,消退指数与棉花生长时间系数的拟合关系较好,相关系数最小为0.71,最大为0.82。经过检验,墒情预报值和实测值吻合很好,相关系数为0.86和0.93。说明消退系数法预报土壤墒情可行。

In order to clarify the appropriate method of soil moisture forecast,provide a reasonable irrigation scheme for cotton production in Xinjiang.Based on an assumption that the depletion of soil water is proportional to soil water storage,the exponential depletion relation of soil water is obtained.The depletion coefficient of soil water and cotton grow-time coefficient were in curve fitting,the results showed that curve fitting is coincide to the fact,the correlation coefficients were 0.71 to 0.82.The forecast soil moisture showed good agreement with the tested data of plot 1 2,the values of the correlation coefficient were 0.86 and 0.93.Soil moisture depletion method for moisture forecast was proved feasible.