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晚茬油菜由于移栽后气温迅速下降,同时大田油菜有四分之三的时间是在霜期生长,在这样的条件下如何促进早发快长呢?抓什么促进早发?我们从试验观察中体会到,油菜地上部分和地下部分的生长有密切的联系,而发苗的主导因素是地下部分。移栽时,我们取都是6片大叶的苗试验,共分3个处理:(1)切去三分之二主根留须根的保3片叶;(2)切去全部须根保留主根的保1片叶;(3)主根和须根完全保留的保4片叶。说明地下部分根系的状况如何直接影响到地上部分的生长。从大面积的调查中也
Late crop of rape due to the rapid decline in temperature after transplanting, and three-fourths of the time in the field rape is growing in the frost, under such conditions, how to promote early hair faster? What to promote early onset? We observed from the experiment Realize, rape aboveground and underground parts of the growth are closely linked, and the main factor is the underground hair seedlings. Transplantation, we take all six large leaves of the seedling test, is divided into three treatments: (1) cut two-thirds of the main root to keep the root of the three leaf insurance; (2) cut all the fibrous roots to retain the main root Paul 1 leaf; (3) the main root and fibrous roots preserved 4 leaves. Explain how the condition of the underground part of the root system directly affects the growth of the aerial part. From a large area survey also