这主要是因为农业肥料的使用增多。
This is mainly because the use of fertilisers in agriculture is increasing.
粪肥和混合肥料的使用几乎与农业同样古老。
The use of manure and composts as fertilizers is probably almost as old as agriculture.
他还增加土壤所含的矿物质，同时减少化学肥料的使用。
He also enriched minerals in the soil while reducing chemical fertilizers.
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