蔬菜根外追施尿素后不宜立即喷药蔬菜播种后，为了满足其生长发育的需要，往往需要较多的追肥。蔬菜追肥通常采用冲施、撒施、埋施、设施追肥及根外追施等方法。根外追肥即叶面喷肥，其特点是用量少、肥效快，也可避免肥分被土壤固定，是一种经济有效的施肥方法。如尿素、... Vegetable root top dressing should not be sprayed immediately after the application of urea Vegetable sowing, in order to meet the needs of its growth and development, often require more dressing. Topdressing vegetables commonly used Chong Shi, spreading, burial facilities top dressing and root top dressing methods. Fertilizer root topography foliar spray, which is characterized by less dosage, fast efficiency, but also to avoid fertilizer fixed by the soil, is a cost-effective method of fertilization. Such as urea, ...