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黄土高原旱农区,冬小麦生产所需水分主要靠土壤贮水进行调节。试验在人工控制条件下,测定了“土壤水库”贮水的生产能力,冬小麦的田间耗水量与耗水系数。关中(土娄)土的田间持水量一般变动在19%至24%之间。在冬春干旱无雨水保证的条件下,播前土壤贮水约在200毫米以上才可获得一定产量。在肥力不成为限制因素的条件下,冬小麦最低的耗水系数为0.75毫米/亩·公斤,在土壤贮水400-600毫米条件下,冬小麦可获得200-300公斤/亩的产量。冬小麦的产量随土壤贮水的增加而提高,与耗水量呈一定程度的正相关。
In the arid area of the Loess Plateau, the water required for the production of winter wheat mainly depends on the soil water storage. Test Under artificial control conditions, the determination of “soil reservoir” storage capacity of water, field water consumption and water consumption coefficient of winter wheat. The water volume in Guanzhong (Lou) soil generally varies between 19% and 24%. In winter and spring drought conditions without rain guarantee, sowing soil water storage capacity of about 200 millimeters before they can get a certain yield. Under the condition that fertility is not a limiting factor, the minimum water consumption coefficient of winter wheat is 0.75 mm / mu kg, and winter wheat can yield 200-300 kg / mu under 400-600 mm soil water storage. The yield of winter wheat increased with the increase of soil water storage and positively correlated with the water consumption.