氨挥发是早作石灰性土壤上氮肥损失的重要途径，盐渍化土壤上氮肥的氨挥发损失较非盐渍化土壤更为严重。
Ammonia nitrogen loss is an important way to calcareous soils, and it is more serious in saline soil than in non-salinization soil.
“如果氮肥用在植物中，你想用的地方，是不会损失很多的，”约翰逊说。
“You have less nitrogen available for loss if it’s being used where you want it, in the plant,” Johnson says.
过量的施用氮肥，不仅造成大量的经济损失，更重要的是引起一系列环境问题。
Over-use N fertilizer may not only cause economic losses, but produce many environmental problems.
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