It is good to use natural manure.

用自然肥料是好的。

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Both fertilizers and manure release nitrogen into natural systems such as rivers, upsetting the natural balance.

化肥和粪肥都释放氮到自然生态系统，如河流，从而破坏自然的平衡。

youdao

He plans to fertilise his fields with manure, rather than chemicals derived from oil and natural gas.

他想用肥料种地而不是用从石油和天然气中提炼的化学成分。

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Scotts plans to gradually introduce more gardening soil, fertilizer and bug killer made with natural ingredients, including animal manure and Sri Lankan coconut husks.

FORBES: Organic Miracle Needed

Inorganic fertiliser just replaced natural nutrients, and more efficiently than manure.

ECONOMIST: Norman Borlaug