In theory extra carbon dioxide in the atmosphere should help plants grow faster, though whether this actually happens may also depend on the amount of nitrogen in the soil.

理论上，大气中二氧化碳含量增多会使作物生长加快，实际上，还要看土壤中所含氮成分的多少。

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And scientists say it will grow larger in years to come, if something is not done to reduce the amount of nitrogen in the Mississippi River.

科学家表示，如果不采取措施减少密西西比河的含氮量，未来几年死水区会愈发扩大。

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Under lower fertility conditions, the fertilization with the appropriate amount of nitrogen in this area could increase wheat yield and enhance wheat drought resistance.

在旱地土壤肥力低的条件下，一次施适量氮肥，可促进小麦增产，增强植物的抗旱性。

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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.

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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.

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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.

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