Returns on fertiliser use are diminishing.

施用化肥的收益也正在减少。

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China could cut fertiliser use by at least a third without ill effects.

因此，中国至少可以减少三分之一化肥的用量，而不会造成任何影响。

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So increased fertiliser use would boost yields in some countries and be counterproductive in others.

因此，增加的化肥使用将在一些国家增产，而在其他国家适得其反。

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Nitrous oxide, emitted into the atmosphere from natural and man-made sources, including biomass burning and fertiliser use, was 323.2 parts per billion in 2010 - 20%higher than in the pre-industrial era.

BBC: No let up in greenhouse gas rise

Countries are issuing, or at least preparing, a long list of promises to help finance research into new seeds, build irrigation canals and spread fertiliser use among small farmers (seeds, irrigation and fertilisers were the main components of the first green revolution in the 1960s).

ECONOMIST: The world food summit

Mr Zimba frets that he cannot afford enough seeds or fertiliser to make full use of his land.

ECONOMIST: No title