N losses to the environment and the calculated economic value of these costs for the US.
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Total N applied in the US in 2007 was 14.5 MMt at a value of US$11.5B.a14.5MMt x 0.01×(28+16 g mol−1 / 28 g mol−1 ) × 296×$15/t = US$1.01B.b(14.5 MMt N fertilizer US) / (83 MMt N fertilizer globally) × (0.6 Tg N2O formed from ammonia volatilization) = 0.11 Tg N2O volatized ammonia in the US per year. 0.11 MMt N2O×296×US$15/t = US$0.47B.
创建时间：
2015-12-02
