油菜播种后,在水分、氧气、温度适宜的情况下,一般5～7天就能出苗。在油菜全苗的基础上,抓好三个协调,对培育矮壮苗是很重要的。 1.协调光照与留苗密度的关系 “油菜匀早,越长越好;油菜匀晚,老来光秆”。齐苗就问苗,棵棵放单。1片真叶时,叶不搭叶,二指能通过。3片真叶时定好苗,拳头通得过,苗距7～10厘米见方,每平方米留壮苗100～150株,每1000平方米留苗10万～15万株,可移栽5000～6000平方米大田。留苗掌握早播的适当稀些,晚播的则密些;苗龄长的稀些,苗龄短的则密些;肥地稀些,瘦地密些。 Rape sowing, in the water, oxygen, temperature appropriate circumstances, the general emergence of 5 to 7 days. On the basis of rapeseed whole seedlings, it is very important to cultivate short sturdy seedlings to do a good job in coordinating the three crops. 1. Coordination of light and the relationship between the density of seedlings “Rape uniform early, the longer the better; rape even late, old light culm.” Qi Miao asked Miao, Kekes put a single. When a piece of true leaves, the leaves do not take leaves, two fingers can pass. 3 really leaves when the set of good seedlings, fist pass, the seedling spacing of 7 to 10 cm square, leaving strong seedlings per square meter 100 to 150 strains, 1000 1000 square meters of seedlings per 100,000 to 150,000 transplanting 5000 ~ 6,000 square meters Daejeon. Rare seedlings to grasp the early sowing of seeding, late-sowing is more dense; seedling thinning, seedling shorter is more dense; lean to thin, thin to close.