我省中南部平原区约有三分之二的冬小麦是浇不上水的旱地麦,产量低而不稳。多年的传统,旱地麦多采用1—1.2尺的木制耧宽行播种,原因是怕密度大了土壤水分满足不了小麦的需求。我们在研究冬小麦耗水规律时发现,麦田棵间蒸发量与小麦的遮荫度呈显著的直线负相关。小麦长势好,或行距小密度大,田间遮荫度越大,非生产性的棵间蒸发量占耗水量的比率就越小;相反,小麦行距大,或长势差,通风透光好,田间遮荫度就低,小麦吸收蒸腾消耗的水分占耗水总量的比率就少,而 About two-thirds of winter wheat in the south-central plains of our province is irrigated dry wheat, with low and unstable yields. Years of tradition, the dry land of more than 1 to 0.2-meter-wide mulberry wide sowing, due to fear of density of soil moisture can not meet the needs of wheat. When we studied the law of water consumption of winter wheat, we found that there was a significant linear negative correlation between the evaporation of wheat and the shade degree of wheat. The wheat grows well or the row spacing is small and the field shade degree is larger. The rate of unproductive forest evaporation to water consumption is smaller. On the contrary, the wheat row spacing, or growing poor, ventilation and light, field The degree of shade is low, and the ratio of transpiration consumed by wheat to total water consumption is small