Bison waste no longer fell on the ground to improve the soil.

野牛制造的废物也不再渗进泥土改善土壤了.

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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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Two other low - input way to improve the soil involve manure or nitrogen and phosphorous as fertilizer.

另外两种低投入改善土质的方法包括施用油麻藤和氮磷肥.

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Two other low - input ways to improve the soil involve using manure or nitrogen and phosphorus fertilizer.

另外两个改善土质的低投入方法包括使用有机粪肥或氮、磷化肥.

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It was also effective to improve the soil condition and increase its usable phosphor content.

能改善土壤性状,增加土壤有效磷的含量.

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