Farmers use nitrogen fertilizer (氮肥) to help grow bigger crops.

农民使用氮肥来帮助种植更大的作物。

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The effect of nitrogen fertilizer on accumulation of Pb differed with cultivars.

施肥对水稻植株铅积累的影响因品种而有差异。

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In 2000, about 40 farmers across the state learned how to use nitrogen fertilizer more sparingly.

2000年，全国大约40名农民学习了怎样尽量少用氮肥。

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But improved farming methods later increased their yields and, at the same time, made better use of chemical nitrogen fertilizer.

VOA: special.2009.07.28

University of Virginia professor Jim Galloway calls synthetic nitrogen fertilizer a "wonderful invention" because it increased food production.

VOA: special.2011.04.05

But he says many parts of the world use too much nitrogen fertilizer, and that harms the environment.

VOA: special.2011.04.05

We note that currently in Europe, nitrogen fertilizer inventories are at some of their lowest levels ever.

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Rather than rotating corn planting with soybeans to replace soil nitrogen, many farmers are planting corn year after year and adding large amounts of nitrogen fertilizer.

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Three-quarters of the company's sales are of nitrogen fertilizers, and it has a big position in domestic production, with two of the three largest nitrogen fertilizer plants in North America.

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