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春小麦采用机械播种时,复土深度和米间落粒均匀与否对小麦的生长发育影响很大。本地区为灌溉农业区,冬季土壤冻结层达70—100厘米,早春土壤化冻时,水分滋润,形成「春潮」。在这种情况下,种子复土深度以3—4厘米为宜。过深则种子发芽和出苗迟缓,出苗率降低,出土的幼苗生长较纤弱,根叶茎发育较差,因而降低了产量;播种过浅时,初期生
When spring wheat is sown mechanically, the depth of the soil and the uniformity of the fall of the rice have a great influence on the growth and development of the wheat. The area is an irrigated agricultural area. In winter, the frozen layer of soil reaches 70-100 cm. When the soil is thawed in early spring, the water is moistened and forms a “spring tide.” In this case, the depth of seed to soil 3-4 cm is appropriate. If the seeds are too deep, the seed germination and emergence will be delayed, the emergence rate will be reduced, the seedlings emerging from the soil will be weaker, and the root and stem will develop less well, thus reducing the yield;