这种土壤的结构和肥沃度差异很大。

Such soils vary in texture and fertility.

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随着分解为营养物的有机物质总量的增加，这种生态系统的生产力或肥沃度也增加。

The productivity or fertility of such an ecosystem increases as the amount of organic material that can be broken down into nutrients increases.

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作物种类、肥料用量、土壤肥沃度、生产年度是影响某一地区粮食单产的主要因素。

Crop variety, fertilizer dose, soil condition and production year are main factors influencing per unit yield.

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