integrated fertility index
式中：IFI为耕地地力综合指数（Integrated Fertility Index）；Fi 为 第i个评价指标的隶属度；Ci 为第i个评价指标的组合权重。3）地力等级的划定。
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integrated fertility index
综合生育指数
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Results showed that the Integrated Fertility Index (IFI) of orchard soil in red earth regions of Guangxi were between 0.17 to 0.25 and belong to mid-low level.
结果表明，广西红壤果园土壤肥力综合指标值(ifi)在0 17 ~ 0 25之间，果园土壤肥力属中下水平。
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