尽管施用化学氮肥是提高作物产量的必要措施，但长期大量施用能引起硝态氮在根区以下土层的无效累积。

Although using chemical fertilizer was a necessary measure to increase crop yields, it could cause a large number of nitrate zone of invalid accumulation in the soil.

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但化学肥料尤其是氮肥施用量过多，极易导致产品质量下降、环境污染等问题。

But the use of much fertilizer results in decreasing of quality and a series of serious entironment problems.

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但化学肥料尤其是氮肥施用量过多，极易导致产品质量下降、环境污染等问题。

But the use of much fertilizer results in decreasing of quality and a series of serious entironment problems.

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