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白菜在生长发育过程中,当外叶长有一定数量后,就进入外叶生长后期,开始包心结球。从结球开始到叶球紧实为秋白菜的结球期。一般早熟品种为25～30天,晚熟品种为40～50天左右。结球期还可分为:一是结球前期,从卷心到拉桷,这个时期要求白天20～22℃,夜间10～12℃,晴天多,光照足,土壤湿度大,肥料足,有利于外叶的光合作用和根系吸收。二是结球中期,结球前期和中期是心叶生长最快时期,叶球的80～90%的重量是在这两个时期形成的。三是结球后期,大白菜仍继续生长,叶球重仍在增加。获得包心紧实、洁白柔嫩的叶球是秋白菜生产上重要的经济性状。所以,要特别注意提高结
Cabbage in the process of growth and development, when a certain number of long outer leaves, they entered the late growth of the outer leaves, began to pack the ball. From the beginning of the ball to the leaf ball compact autumn cabbage of the ball. General early maturing varieties for 25 to 30 days, late maturing varieties for 40 to 50 days. Bowel can also be divided into: First, the early ball, from the heart to pull pull, during this period requires 20 ~ 22 ℃ during the day and night 10 ~ 12 ℃, sunny days, light enough, soil moisture, fertilizer enough, there Conducive to photosynthesis and root absorption of the outer leaves. The second is the middle of the ball, the early and midcourse of the ball is the fastest growth of the heart, leaf ball 80 ~ 90% of the weight is formed in these two periods. Third, the late ball, cabbage continues to grow, leaf ball weight is still increasing. Obtained tight heart, soft white leaf ball autumn cabbage production is an important economic traits. So, pay special attention to improve the knot