In Iowa, that region is the north-western part of the state, which enjoys high crop yields but gets 25-50 cents less per bushel because it is too far from the Mississippi river barges.

在艾奥瓦，类似的地区处于该州西北部，虽然农业产量高，但每蒲式尔少挣25到50美分，因为该地区远离密西西比河驳船码头。

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Experimental crop plants that use nitrogen more efficiently provide the same yields as normal crops with less fertiliser.

能更有效地利用氮肥的实验性农作物能在使用较少肥料的情况下做到和普通农作物的产量一样。

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Studies have also shown that new cases of type 1 diabetes crop up more often in winter, when there is less sunshine all around, than in summer.

研究同样表明，那些突然发生的1型糖尿病的新案例，大多出现在冬季，由于与夏季相比，周围的阳光照射较少。

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Sure, bonds have generated strong returns since then but that is partly because interest rates have been on a steady downward slope to zero, pushing up the value of bonds even as each new crop yields less.

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The other is that monoculture and less crop rotation risks exhausting the soil.

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This meant she was unable to use the fertilizer, which led to a poor harvest of her maize crop, which meant less food for her children.

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