轮作是应用于有机农业上的一种简单而有效的技术，能减少农药的使用和提高土壤肥力。

Crop rotation is a simple and effective technique used in organic agriculture to reduce the need for pesticides and improve soil fertility.

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土壤生态系统中水分和养分的丰度和有效性决定土壤的肥力。

The abundance and availability of water and nutrients in a soil ecosystem determine its fertility.

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这是保持土壤肥力的一个有效办法。

It's an effective way to maintain soil fertility.

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