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1. The ferromagnesian index of the soil is an important factor in determining its suitability for agriculture.
土壤的铁镁指数是决定其是否适合农业种植的一个重要因素。
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2. The iron content in the soil is closely related to the ferromagnesian index, which can affect crop yield.
土壤中的铁含量与铁镁指数密切相关，这会影响作物产量。
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3. The ferromagnesian index is used to measure the amount of iron and magnesium in rocks and minerals.
铁镁指数是用来测量岩石和矿物中铁和镁的含量的。