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。
N efficiency can be enhanced by breeding for cabbage.
因此，通过品种选育提高结球甘蓝氮素效率是可行的。
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