He grew a different crop on the same field five years in a row, what researchers call crop rotation.

他连续5年在同一块地上轮流种植不同作物，研究人员称之为轮作。

《柯林斯英汉双解大词典》

Their reason is that if there is no road, their bumper crop will just rot in the field.

他们的理由是，如果没有路，丰收的作物将只会烂在田里。

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In the centre of the field the wheat is abundant, yielding 10 tonnes a hectare, one of the highest rates in the world for a commercial crop.

试验田中央的小麦确实丰产，每公顷产出10吨，单产率在经济作物领域数一数二。

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The best evidence is a report to Anslinger by a field agent on the 1934-35 hemp crop in Minnesota.

ECONOMIST: Legalising drugs

My 1979 dissertation was a model relating interannual and interseasonal variations in the shape of the atmosphere, as reflected by the surface barometric pressure field, to variations crop yields across the United States.

FORBES: Climategate II: An Open Letter to the Director of the National Center for Atmospheric Research