Principal component analysis was used to derive soil fertilityvariation factors.
运用主成分分析选取土壤肥力变异因子。
2
In the light of experimental results on variation in fertility of photo (temperature) sensitive sterility line of rice proposed are the eigenvalues and a quantifying model for the variation.
依据水稻光(温)敏不育系育性变化的实验结果，提出衡量不育系育性变化规律的特征值及其量化模型。
3
As a result, the research on the rules governing the variation of the soil fertility enjoys a strategic significance.