Anything that can increase farming efficiency—the amount of crops we can produce per acre of land—will be extremely useful.

任何能提高农业效率的东西——能提高我们每英亩土地生产的农作物数量的东西——都是非常有用的。

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By chemically extracting nickel form the ash, they produced 100 pounds of nickel per acre of land at a total cost per pound slightly above that of current mining.

通过化学方法从灰烬中提取镍，他们每英亩土地生产了100磅镍，每磅的总成本略高于目前的采矿成本。

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According to farmers' report, the amount of insecticide needed per acre to control insect pests was only slightly lower for those who tried the modified seed than for those who did not.

根据农民的报告，试验转基因种子的人与没有试验的人相比，每英亩用于控制害虫的杀虫剂用量只是稍微少一点。

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Their goal: crops that limit the use of pesticides and fertilizers while delivering more food per acre planted.

FORBES: Green Genes

We already handled far more than our share, and had less than one tree per acre.

CNN: Commentary: Green way to create jobs, save cities

But wheat yields per acre grew worse if anything as soil nutrients were depleted.

ECONOMIST: The story of man's staple food