They found many ways to improve the soil.

他们找到了很多改良土壤的办法。

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They improve the soil when their leaves fall.

落到地上的树叶还能改良土壤。

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He showed that adding lime, micronutrients and fertilizer would greatly improve the soil.

他表示，加石灰、微量元素和肥料，土壤将大大提高。

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If possible, in the year before you plant potatoes, plant a cover crop to improve the soil and the potato production.

VOA: special.2009.03.10

To improve clay soils, mix in garden waste or other organic matter and turn the soil deeply in the fall.

VOA: special.2009.03.10

Corn harvests remain small. The researchers say farming methods in Sub-Saharan Africa need to improve or else poor quality soil will increase rural poverty.

VOA: special.2009.07.28

The adoption of herbicide-resistant crops could help improve water and soil quality by reducing the need for tilling.

FORBES: Magazine Article

The scheme is an agri-environment scheme, which provides funding for farmers to manage their land in a way designed to benefit biodiversity and landscape features and improve the quality of water and soil.

BBC: Environment and Sustainability Committee