Corn is one of the best indicators for nitrogen deficiency among the field-crop plants.

玉米是大多数大田作物中缺氮的最好的指示植物。

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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。

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

ECONOMIST: Legalising drugs

Tilling, or plowing, a field prepares the soil for planting and destroys weeds, but a Roundup-ready crop doesn't require extensive tillage.

FORBES: Magazine Article

Well, in the dozen years since those two biggies were founded, countless other Internet tools online travel agents, booking engines, review sites and more have been added to the mix, with an ever-growing crop of newbies striking us as particularly noteworthy additions to the field.

FORBES: The Best New Travel Sites: Trippy, Hipmunk And More