The use of manure and composts as fertilizers is probably almost as old as agriculture.

粪肥和混合肥料的使用几乎与农业同样古老。

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Ripened composts that have taken six months to a year are more stable.

持续六个月至一年的成熟堆肥会比较稳定。

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Ripened composts that have taken six months to a year are more stable.

持续六个月至一年的成熟堆肥会比较稳定。

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