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在灰淤土上设置三因素五水平回归最优设计肥料试验。结果表明，大白菜生长前期吸收氮钾相对较多，后期吸收磷素相对较多。每生产１０００ｋｇ鲜重大白菜平均吸收Ｎ２．６８ｋｇ、Ｐ２Ｏ５０．６４ｋｇ和Ｋ２Ｏ２．９４ｋｇ。回归方程显示，肥料对产量的影响依次为氮肥＞磷肥＞钾肥。亩产９５００ｋｇ以上的施肥方案为Ｎ２１．７～２３．８ｋｇ、Ｐ２Ｏ５８．１—８．９ｋｇ和Ｋ２Ｏ１０．６～１２．１ｋｇ。
In the silt soil set three factors and five levels of regression design of the best fertilizer experiment. The results showed that there were more N and K uptake in the early stage of growth of Chinese cabbage and more absorption of phosphorus in the late stage. Each production of fresh weight of cabbage average absorption of N2.68kg, P2O50.64kg and K2O2.94kg. Regression equation shows that the impact of fertilizer on the yield were nitrogen> phosphate> potassium. Fertilization program of 9500kg per mu is N21.7 ~ 23.8kg, P2O58.1-8.9kg and K2O10.6 ~ 12.1kg.