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大白菜生长期短,产量高,要求水肥条件高。据研究,每生产50 00公斤大白菜,约吸收纯氮7.5公斤(合硫铵37.5公斤),磷酸3.5公斤(合过磷酸钙30公斤),氧化钾10公斤(合硫酸钾20.5公斤)。所以,种好大白菜必须采取综合农业生产技术措施。现就莲座期和包心期田间管理谈点意见。一、莲座期的管理:白菜9片叶到22—24片叶植株生长较快,管理上主要是:中耕蹲苗、浇水追肥。定苗后立即进行第一次追肥,亩施尿素10—15
Chinese cabbage growth period is short, high yield, requiring high water and fertilizer conditions. According to the research, each 50000 kilograms of Chinese cabbage is produced, about 7.5 kilograms of pure nitrogen (37.5 kilograms of ammonium sulfate), 3.5 kilograms of phosphoric acid (30 kilograms of superoxide) and 10 kilograms of potassium oxide (20.5 kilograms of potassium sulphate). Therefore, the cultivation of Chinese cabbage must take comprehensive agricultural production technical measures. Now on the rosette period and period field management talk about the views. First, the rosette management: cabbage 9 leaves to 22-24 leaf plant growth faster, management is mainly: cultivating squat seedlings, water top dressing. Dingmiao immediately after the first dressing, Urea urea 10-15