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油菜播种后,在适宜条件下,一般5～6天就可出苗。在油菜全苗的基础上,为培育矮壮苗,在苗期管理上要抓好三项工作。1.及时间苗定苗,合理确定留苗密度油菜齐苗时就要开始间苗,达到棵棵单立不叠连;一片真叶时,叶不搭叶,二指能通过;三片真叶时定好苗,拳头通得过,苗距8～10厘米见方,每平方米留壮苗90～135棵。早播宜稀,晚播宜密;秧龄长宜稀,秧龄短宜密;肥地稀些,瘦地密些。这样既能解决地上部争光照的矛盾,又能解决地下部争夺水肥的矛盾,达到上下都促进。2.通过化学调控和水肥促控,协调油菜生长和积累的关系油菜秧苗期进行化学调控,可促使叶片数和绿叶数增多,叶色深绿,叶柄变短,根颈粗壮,根系发达,一般可增产
Rape sowing, under suitable conditions, generally 5 to 6 days can be sprouted. On the basis of rapeseed whole seedlings, in order to cultivate short sturdy seedlings, we should do a good job of three tasks in seedling management. 1. Miao Dingmiao time and reasonable to determine the density of seedlings Ramet Qi Miao should start when the seedlings to reach a single tree does not stack together; a true leaf, the leaves do not take leaves, two fingers to pass; three true leaves Set a good seedlings, fist pass, seedlings from 8 to 10 cm square, leaving a strong seedlings per square meter 90 ~ 135. Early sowing should be thin, evening broadcast should be dense; seedling age should be thin, young age should be short; thinner to fat, thin to close. This will not only solve the contradiction between the ground and the light competition, but also solve the contradiction between the underground water and fertilizer competition, up and down to promote. 2. Through the chemical control and water and fertilizer to promote and coordinate the relationship between rape growth and accumulation of rapeseed seedling chemical regulation, can promote the number of leaves and the number of green leaves increased, dark green leaves, petiole shorter, thick rootstock, root system developed, general Can increase production