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1986～1990年,在高产地力条件下,进行了麦田水分变化规律及节水灌溉方案的研究。研究的主要结果:1.麦田0～300cm土层的土壤水分,可分为苗期供水层、中期供水层、后期供水层及稳定供水层等层次。2.小麦亩产184.9～456.1kg,耗水量为147.5～451.6mm。高产(400kg以上)小麦耗水量为338～536mm。耗水量的水源分别来自:降水占31.1％～53.7％,灌水占23.4％～33.6％和土壤供水占22.8％～32.7％。3.0～140cm上层的供水量为107～233mm,约占土壤有效贮水量的1/3～1/2。4.高产麦田的节水灌溉方案:灌水次数2～3次;灌水量低限80～115mm,高限125～180mm,干旱年份取高限。灌水时期:播前(底墒)、起身(二棱期)或拔节期、孕穗或灌浆期。
From 1986 to 1990, under the conditions of high yielding power, the law of water change in wheat field and the scheme of water saving irrigation were studied. The main results are as follows: 1. Soil moisture in 0 ~ 300cm soil layer can be divided into water supply layer, medium water supply layer, later water supply layer and stable water supply layer. 2. Wheat mu produce 184.9 ~ 456.1kg, water consumption is 147.5 ~ 451.6mm. High yield (400kg above) wheat water consumption of 338 ~ 536mm. The sources of water consumption are: precipitation 31.1% ~ 53.7%, irrigation 23.4% ~ 33.6% and soil water 22.8% ~ 32.7%. The upper water supply of 3.0 ~ 140cm is 107 ~ 233mm, which accounts for about 1/3 ~ 1 / 2.4 of the effective soil water storage capacity.The water-saving irrigation scheme of high-yielding wheat field is 2 ~ 3 times of irrigation and the lower limit of irrigation is 80 ~ 115mm, the upper limit of 125 ~ 180mm, take the high limit of drought years. Irrigation period: before sowing (soil moisture), got up (two edges) or jointing, booting or filling period.