The composition of exchangeable cation and the soil nutrient content can be used as the indexes to evaluate soil chemical fertility evolution, especially the former is more important.

交换性阳离子组成、养分全量及速效含量可作为评价红粘土红壤化学肥力演化的指标。

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The goal of the soil scientist is to improve the soil fertility and the chemical, physical, and microbial characteristics of the soil.

土壤学家的目标是提高土壤肥力并改进土壤的化学、物理和微生物性状。

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Fertilizers enhance the natural fertility of the soil or replace the chemical elements taken from the soil by previous crops.

肥料能提高土壤的肥力，或补充土壤中被以前作物吸收的化学元素。

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