白菜的生长量大,生育期短,需要在各个生育期保证营养的供应,才能加速生长,提高产量。白菜在生长过程中吸收大量的氮、磷、钾和一些微量元素。据资料记载:亩产5000公斤大白菜,大约吸收氮13.5公斤、磷4公斤、钾10公斤。各生育期需肥量也有所不同,莲座期以前占吸收总量的10%。结球期占吸收总量的90%。为此: 一、幼苗期追提苗肥从子叶 Large cabbage growth, short growth period, the need to ensure the supply of nutrients in all growth stages in order to accelerate growth and increase production. Cabbage in the growth process to absorb large amounts of nitrogen, phosphorus, potassium and some trace elements. According to data records: 5000 kg of cabbage per mu, about 13.5 kg nitrogen, phosphorus 4 kg, potassium 10 kg. Fertility needs of different growth stages are also different, rosette period ago accounted for 10% of the total absorption. Cotyledon accounted for 90% of the total absorption. To this end: First, seedling chasing Miaofei cotyledons