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油菜是越冬作物,其生长发育盛期主要在冬前和春后,越冬期间生长发育极为缓慢。冬前的苗期以营养生长为主,约占油菜全生育期的一半左右(90天以上);越冬期30天左右,春后逐渐转为以生殖生长为主,也有90天左右。那么,要夺取油菜高产,究竟应该促进冬前的生长发育,还是促进春后的生长发育?由于看法不一,造成在油菜栽培技术上有很大差异,如有人主张适时早播,也有人主张可适当推迟播种;有人主张重
Rape is a winter crop, its growth and development of the main growth in winter and spring, overwintering growth is extremely slow. Pre-winter seedling vegetative growth-based, accounting for about half of the whole growth period of rape (90 days or more); wintering period of about 30 days after the spring gradually converted to reproductive growth, there are 90 days or so. So, to seize rapeseed yield, whether it should promote the growth and development before winter, or promote the growth and development after spring? Because of different opinions, resulting in rape cultivation techniques are very different, if someone advocates timely sowing, it was also claimed Sowing may be postponed properly; some advocate weight