关键词: N₂O排放, 氮磷钾配比, 包膜肥, 复合肥, 全球增温潜势

Abstract: Static closed chamber technique and contrast method were adopted to study the effects of three coated compound fertilizers (N:P₂O₅:K₂O=19:8.6:10.5, high N; 14.4:14.4:14.4, balanced NPK; and 12.5:9.6:20.2, high K) on the N₂O emission from a lateritic red soil under the condition of no crop planting, taking uncoated compound fertilizers (N:P₂O₅:K₂O=20:9:11, high N; 15:15:15, balanced NPK; and 13:10:21, high K) as the contrasts. Different formula of fertilizer NPK induced significant difference in the N₂O emission. Under the application of uncoated compound fertilizers, the cumulative N₂O emission was in the order of balanced NPK ≥ high N > high K. Applying coated compound fertilizers decreased the N₂Oemission significantly, and the emission amount under the application of high N, balanced NPK, and high K was 34.4%, 30.5%, and 89.3% of the corresponding uncoated compound fertilizers, respectively. Comparing with the application of uncoated compound fertilizers, applying coated compound fertilizers also decreased the daily N₂O flux significantly, and delayed and shortened the N₂O peak, suggesting that coated fertilizers could reduce soil nitrogen loss and the global warming potential induced by N₂O emission.

Key words: N₂O emission, NPK formula, coated fertilizer, compound fertilizer, global warming potential