甘蓝在采收前数天,在田间用100mg/kg或250mg/kg的2,4-D钠盐水溶液喷洒,或者喷洒100mg/kg的2,4-D,均可延长冷藏期3个月不脱叶。 花椰菜(菜花)的食用部分,虽然不是叶子,但花球周围的叶片是保护花椰菜新鲜状态不可少的。在采收前3～5天,用100mg/kg的2,4-D钠盐喷洒到花椰菜的叶片上面(不要喷在花球 Brassica oleracea L. can be extended for 3 months before harvest, by spraying with 100 mg / kg or 250 mg / kg 2,4-D sodium salt solution in the field or by spraying 100 mg / kg 2,4-D Leaves off. The edible parts of cauliflower (cauliflower), although not leaves, are essential for preserving the freshness of cauliflower. 3 to 5 days prior to harvest, spray the broccoli leaves with 100 mg / kg of 2,4-D sodium salt (do not spray on the curd