The amount of nitrogen needed will increase as yield increases.

随着产量增加，需氮量也要增加。

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The applied amount of nitrogen had a significant effect on grain yield.

施氮量对杂交稻的产量形成和氮肥利用的影响十分明显。

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This is largely because of reductions in fertiliser use and the amount of nitrogen leaching from manure.

这是相当大的一部分，因为可以减少施肥和从动物粪便中滤出的氮。

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"You can work out the budget, and there is a phenomenal amount of nitrogen accumulating somewhere in the basin, " said Professor Tim Burt, also of Durham University.

BBC: Thames archive reveals long nitrate rise

The largest problem is the dangerous amount of nitrogen oxide (which mixes with vehicle-exhaust gas to create ozone, and then smog) coughed out by the state's industrial plants.

ECONOMIST: The Lone Smog State

But if these effects could be managed, then it is not clear that the amount of nitrogen being drawn out of the air would, of itself, be a problem.

ECONOMIST: The global environment