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1死苗原因西北农林科技大学农学院小麦研究所研究人员认为冬季小麦死苗有以下几个原因。内因。若采用抗寒、抗旱性差的小麦品种,遇冻害易出现死苗现象,播种过早、冬前穗分化到二棱期的麦苗耐寒能力较弱,遇冻害时死苗严重。另外,一些晚播弱苗由于自身积累的糖分较少,遇寒害、旱害也容易出现死苗。外因。夏秋季降水少,土壤底墒不足,冬季少雨雪、多寒风,会加剧土壤干旱,导致小麦生理脱水而死亡。播种过晚、过深或过密,均易形成弱苗,不利于小麦安
A dead seedlings Northwest Agriculture and Forestry University College of Agriculture Wheat Research researchers believe that winter wheat dead seedlings for several reasons. Internal factors. If the use of cold, drought resistance of wheat varieties are prone to dead fry in the phenomenon of frozen seeding, sowing too early, before the winter spike differentiation to the two edges of the wheat cold hardiness in the case of frostbite serious dead seedlings. In addition, some late-season weeds due to their accumulation of less sugar, chills, drought also prone to dead seedlings. External factors. Less precipitation in summer and autumn, lack of soil moisture at the end of the winter less snow, more wind, will aggravate the soil drought, leading to physiological dehydration and death of wheat. Sowing too late, too deep or too close, are easy to form weak seedlings, is not conducive to wheat safety