An optimized regression design with three factors and five levels was adopted to study the effects of n, K and s fertilizers on the yield and nitrate content of radish.
为使人们能够吃上健康的无公害食品，采用三因素五水平最优回归设计，探讨了氮钾硫配方施肥对黄泥土萝卜产量和硝酸盐含量的影响。
The R/T of radish was closely associated with N, P, K concentration.
氮、磷、钾浓度与萝卜的根冠比大小关系密切。
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