施一次送嫁肥 油菜育苗中期一般要进行蹲苗,少施或不施氮肥,以增加植株体内碳素含量,利于幼苗从发叶期顺利过渡到壮苗充实期,达到培育壮苗的目的。但在移栽油菜起苗前则要追施一次送嫁肥,以提高菜苗体内的含氮量,增强发根力。实践证明,施用送嫁肥的油菜苗,栽后活棵返青快,叶片枯萎脱落少。送嫁肥一般在移栽前的5—7天施用较为适宜,667平方米苗床追尿素7.5公斤左右,以菜苗得力不披叶 Fertilization once delivered to the middle of a medium seeding generally squatting, less or no nitrogen fertilizer to increase plant carbon content, which will help the seedling transition from the leaf to the seedling filling period, to achieve the purpose of nurturing strong seedlings. However, in transplanting rapeseed should be pursued before the top dressing to send fertilizer, in order to improve the nitrogen content of vegetable seedlings, enhance hair root strength. Practice has proved that the application of fertilizers to send rape seedlings, planted live green trees back quickly, less withered leaves shed. Delivery of fertilizer generally 5-7 days before transplanting applied more appropriate, 667 square meters seedbed about 7.5 kilograms of urea to recover,