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一、三种生长类型及某在生产上作用: 油菜是跨年生的越冬作物,全生育期在240～250天左右。油菜的生育过程经历“高——低——高”的外界气温条件,生长受自然条件的密切制约。实践证明,油菜越冬前的生长状况,对油菜高产稳产有着明显的制约和影响,是油菜稳产、高产的基础。因为油菜长柄叶的生长,油菜叶片的叶芽分化,以及一次大分枝的腋芽分化都是在冬前完成和决定的。因此冬前叶片数的多少和大小,不但反映了油菜苗的健壮程度和冬前长势,而且直接决定一次大分枝的数量,和产量有密切关系,据中国油料所研究:越冬(小雪)
First, the growth of three types and a role in the production: Rape is a perennial winter crops, the whole growth period of 240 to 250 days. The rape’s fertility process experienced “high-low-high” temperature conditions outside the environment, the growth of closely constrained by the natural conditions. Practice has proved that the growth of rape before winter, on the rape of high and stable yield has obvious constraints and influence, is rapeseed stable, high yield basis. Because of the growth of the long-handled rape leaves, the leaf bud differentiation of rape leaves and the axillary bud differentiation of a large branch are both done and decided before winter. Therefore, the number and size of the leaves before winter not only reflect the robustness of rape seedlings and the growth of winter, but also directly determine the number of large branches, and yield are closely related, according to Chinese oil research: wintering (snow)