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1冬小麦三类苗的表现症状冬前亩茎数在45万以下,单株分蘖2.5个以下,三叶以上大蘖1.5个以下,单株次生根3条以下;春季亩茎数在60万以下,单株分蘖在3.5个以下,三叶以上大蘖3.5个以下,单株次生根6条以下。2冬小麦三类苗出现的原因1)整地质量粗放。整地时未达到深、实、平的标准,耕层浅不利种子生根及分蘖生长。2)秸秆量大,还田质量差。由于前茬作物玉米种植密度加大,秸秆量相对增加,导致耕作层秸秆增多、土壤减少、种子
A winter wheat three kinds of seedlings symptoms Pre-winter acres of stalks in 450,000 or less, less than 2.5 single tillers, more than 3.5 trichosanthes below the secondary roots of three plants below the number of acres of spring in less than 600,000 mu , Less than 3.5 tillers per plant, less than 3.5 tillers above trilobes, and less than 6 secondary roots per plant. 2 three types of winter wheat seedlings appear 1) the quality of extensive land preparation. Soil preparation did not reach the deep, real, flat standard, shallow plowing seedling tillering and growth. 2) large amount of straw, poor quality. Due to the increased planting density of corn in the previous crop, the amount of straw increased relatively, which led to more straw and less soil in the tillage,