Previous studies predicted massive releases of organic carbon from fields converted from grass to corn or other energy crops.

之前的研究表明，由草地转化成玉米地或其他能源作物用地的农田会释放出大量有机碳。

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The System gives scientific institutions, farmers, and private sector plant breeders the opportunity to work with the materials stored in gene Banks or even crops growing in fields.

该系统为科研机构、农民和私营部门的植物育种者提供了利用那些保存在基因库甚至生长在田间的遗传材料的机会。

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As a result, many farmers are letting their fields lie fallow or switching from thirsty crops, such as cotton, to those that need less.

因此，许多农场主让土地休耕，或不再种植棉花一类需水量大的作物，而改种那些需水量更小的作物。

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Then Lanworth knits in observations made at ground level by four pairs of people who travel the back roads of America taking notes on how far along crops are or how wet or dry the fields might be.

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There has been a lot of testing on crops as to what happens when certain pests or weeds get into fields or how new varieties perform with different management practices.

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In the fields, in the shadow of giant billboards giving motivational advice or productivity targets, women in headscarves bend over crops of maize, corn and rice.

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