“苗好三丰收,苗差一半丢”。壮苗是油菜高产栽培的基础。据试验,6片叶壮苗比4片叶小苗移栽的每亩增产油菜籽25—37.5公斤。壮苗标准是:苗高20—23厘米,绿叶6—7片,根颈粗0.5—0.6厘米,叶柄粗短,叶片密集,没有高脚和曲根苗,青秀健壮无病虫。达到这一标准,主要技术环节应掌握以下四点: 一、适时早播。这是培育壮苗的前提。油菜冬前营养生长期的长短,主茎叶片数的多少,对产量的影响很大。适时早播,就能充 “Miao good three harvest, poor seedlings half lost.” Strong seedling rape is the basis of high yielding cultivation. According to the test, 6 leaves strong seedlings 4 leaf transplanting per acre yield rapeseed 25-37.5 kg. Strong seedling standard is: 20-23 cm in height, 6-7 green leaves, root neck coarse 0.5-0.6 cm, petiole stubby, leaf-intensive, there is no high-legged and Qugen seedlings, green and strong robust disease-free pests. To achieve this standard, the main technical aspects should have the following four points: First, timely early broadcast. This is a prerequisite for nurturing seedlings. Rape winter nutrition before the growth of the length of the main stem number of leaves, a great impact on the yield. Timely early broadcast, you can charge