Crop coefficient is the basic parameter for determining crop water requirement.
作物系数是计算作物需水量必不可少的参数。
Crop maternal effect (m) is an important parameter in crop heredity and breeding, and can be determined from the difference between reciprocal crosses in F1 generation.
作物母体效应(M)是作物遗传育种中一重要参数。采用正反交f 1性状差异，测定出母体效应方差。
Droplet size parameter is the most important quality index for estimating the performance of crop protection equipment.
雾滴的尺寸参数是评价植保机械性能的最主要质量指标。
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