They use special chemical substances to accelerate the growth of crops.

他们使用特殊的化学物质来促进农作物的生长。

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For the first time since the 1960s the yields of the world's most important crops, wheat and rice, are rising more slowly than the global population (see special report).

当前是自二十世纪六十年代以来，世界上第一次出现重要农作物——小麦和大米——产量的增幅小于全球人口增长(请阅读专题报道)。

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In some countries, researchers are now experimenting with agro-forestry-the planting of crops between rows of special trees.

有些国家的研究人员正在开展一项农林相结合的实验——在一排排特殊的树木间种植庄稼。

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The Commission, which drafts EU laws, says farmers should have to work for part of their subsidies by helping wildlife - diversifying crops, leaving grassland unploughed and creating special ecological areas.

BBC: Will MEPs scupper greening of EU agriculture?

For the first time since the 1960s the yields of the world's most important crops, wheat and rice, are rising more slowly than the global population (see special report).

ECONOMIST: The future of food