这个过程在1956年本来可以自然开始的，那时在位于密克罗尼西亚的吉尔伯特群岛上英国管理部门对出口用作肥料的磷酸盐-鸟的粪肥-强制增税。

That process may have started inadvertently in 1956 when the British administration of the Gilbert Islands in Micronesia put a levy on the export of phosphates-bird manure-used in fertiliser.

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换句话说，农民不可能省钱去买肥料，但是他们能储存粪肥。

In other words, farmers cannot save the money to buy fertiliser, but they can save the physical fertiliser itself.

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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.

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