An optimum regression design with three factors and five levels was adopted to find the effects of n, K and s fertilizers on the yield of Chinese cabbage and the nitrate content in its plant.

采用三因素五水平最优回归设计，研究了黄泥土配施氮钾硫肥对大白菜产量和硝酸盐含量的影响。

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There are obvious mutuality in the plant biomass, grain N content, Total amount of N absorption with yield, grain N content have maximal immediate effect to yield.

植株干重、子粒氮含量、总吸氮量与产量显著相关，子粒氮含量对产量的直接影响最大。

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At the mean time, D fertilizer particle microcapsules were made with higher content of K but median content of N to meet the demands of tobacco plant at middle and later stage and promote maturity.

同时，为满足烟株中后期的养分需求及促进成熟落黄，制作重钾适氮的缓释肥包膜D粒子。

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