Based on 2-D-optimum orthogonal design field experiment in the jointing-heading period of Phleum pratense L. , the results show that potassium content is the most productive on the seed yield, phosphorus comes next and nitrogen the least.

• 摘要采用二因素D-饱和最优设计，通过猫尾草拔节－抽穗期的根氮、磷、钾和茎叶氮、磷、钾的含量对其种子产量和产量因子进行灰关联熵分析。