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根据主成分分析模型中的相关结构分析理论，构造了一个在水稻土肥力水平分类中对主要肥力因素指标进行筛选的数学模型，并通过实例进行了验证，取得了良好效果。
According to the related structural analysis theory in the principal component analysis model, a mathematical model for screening the main fertility indicators in paddy soil fertility level was constructed and validated through examples. Good results were obtained.