Nitrification inhibitor nitrapyrin does not affect yield-scaled nitrous oxide emissions in a tropical grassland

• 作者: Ana Gabriela PéREZ-CASTILLO Cristina CHINCHILLA-SOTO Jorge Alberto ELIZONDO-SALAZAR Ronny BARBOZA Dong-Gill KIM Christoph MüLLER Alberto SANZ-COBENA Azam BORZOUEI Khadim DAWAR Mohammad ZAMAN
• 来源期刊: 土壤圈（英文版）
• 年，卷（期）: 2021,（2）
• 所属期刊栏目: Research Articles
• 页码范围: 265-278
• 页数: 14页
• 语种: 英文
• DOI: 10.1016/S1002-0160(20)60070-4

摘要

Urea is the most common nitrogen(N)fertilizer used in the tropics but it has the risk of high gaseous nitrogen(N)losses.Use of nitrification inhibitor has been suggested as a potential mitigation measure for gaseous N losses in N fertilizer-applied fields.In a field trial on a tropical Andosol pastureland in Costa Rica,gaseous emissions of ammonia(NH3)and nitrous oxide(N2O)and grass yield were quantified from plots treated with urea(U;41.7 kg N ha-1 application-1)and urea plus the nitrification inhibitor nitrapyrin(U+NI;41.7 kg N ha-1 application-1 and 350 g of nitrapyrin for each 100 kg of N applied)and control plots(without U and NI)over a six-month period(rainy season).Volatilization of NH3(August to November)in U(7.4％ ±1.3％ of N applied)and U+NI(8.1％ ±0.9％ of N applied)were not significantly different(P＞0.05).Emissions of N2O in U and U+NI from June to November were significantly different(P＜0.05)only in October,when N2O emission in U+NI was higher than that in U.Yield and crude protein production of grass were significantly higher(P＜0.05)in U and U+NI than in the control plots,but they were not significantly different between U and U+NI.There was no significant difference in yield-scaled N2O emission between U(0.31±0.10 g N kg-1 dry matter)and U+NI(0.47±0.10 g N kg-1 dry matter).The results suggest that nitrapyrin is not a viable mitigation option for gaseous N losses under typical N fertilizer application practices of pasturelands at the study site.