effect of population density 族群密度效应
reciprocal equation of common-density effect 共同密度效应互反方程
effect of larval density 幼虫密度效应
change of density effect 密度变化效应
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The effect of density of winter wheat basic seedling on grain yield in condition of chemical manipulation was studied with semi-winter variety Jihe 02.
用半冬性品种济核02为供试材料，研究了化学控制条件下小麦基本苗对产量的效应。
We also assemble a set of permeability testing equipment, by which we study on the effect of density, thickness and air pressure on the relative permeability.
并利用自行组装的测试设备研究了柔性石墨板密度、厚度以及空气压力差对相对透气系数的影响。
The results showed as follows. The effect of density and nitrogen on effective flower numbers reached very significant level, and their interaction reached significant level.
结果表明，密度和施氮量对有效花朵数的影响达到极显著水平，其交互作用效应也达到显著水平。
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