本文所研究的氮肥如未特殊说明，均指化学合成氮肥（CF-N）。
Without special instructions, this paper studied "nitrogen" is to synthetic fertilizer (CF-N).
粮食运输以及农业机器都需要石油，合成氮肥(2002年以来价格已经增长2倍)生产离不开天然气。
Oil fuels transportation and farm machinery, and natural gas is the basis of synthetic nitrogen production (prices have tripled since 2002).
但是现有控制释放氮肥因大多成本过高并且控制释放膜使用的膜材料多为难降解的合成高分子材料而限制了其大规模应用。
However, the application of controlled release fertilizer is limited by its high cost and environmental pollution brought from membrane materials of synthesized polymer with low degradation.
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