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.
还探讨了氮肥淋溶过程中的氮形态变化，以及施氮量和土层深度对氮肥淋浴损失的影响。
The leaching process and nitrogen forms, and the effects of application rate and the depth of soils on nitrogen loss by leaching were also discussed in this paper.
在苏南太湖流域，对不同氮肥施用水平下水稻的产量、氮肥利用率及氮肥水环境损失进行了研究。
The effects of N application rate on the characters of uptake nitrogen and nitrogen recovery of different rice varieties was studied under field conditions.
在苏南太湖流域，对不同氮肥施用水平下水稻的产量、氮肥利用率及氮肥水环境损失进行了研究。
The effects of N application rate on the characters of uptake nitrogen and nitrogen recovery of different rice varieties was studied under field conditions.
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