Pedosphere 31(2): 265--278, 2021
ISSN 1002-0160/CN 32-1315/P
©2021 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Nitrification inhibitor nitrapyrin does not affect yield-scaled nitrous oxide emissions in a tropical grassland |
Ana Gabriela PÉREZ-CASTILLO1 , CristinaCHINCHILLA-SOTO1, Jorge Alberto ELIZONDO-SALAZAR2, RonnyBARBOZA1, Dong-Gill KIM3, Christoph MÜLLER4,5, AlbertoSANZ-COBENA6, Azam BORZOUEI7, Khadim DAWAR8, MohammadZAMAN9 |
1Environmental Pollution Research Center(CICA), University of Costa Rica, Montes de Oca 11501(Costa Rica)
2Alfredo Volio Mata Experimental Station, University of Costa Rica, Ochomogo 30304(Costa Rica)
3Wondo Genet College of Forestry and Natural Resources, Hawassa University, P. O. Box 128, Shashemene(Ethiopia)
4Institute of Plant Ecology, Justus Liebig University Giessen, Heinrich-Buff Ring 26, Giessen 35392(Germany)
5School of Biology and Environmental Science, University College Dublin, Belfield, Dublin 4(Ireland)
6Research Center for the Management of Environmental and Agricultural Risks(CEIGRAM), Department of Chemistry and Food Technology(ETSIAAB), Universidad Politécnica de Madrid, Madrid 28040(Spain)
7Nuclear Agriculture Research School, Nuclear Science and Technology Research Institute(NSTRI), Karaj 31465-1498(Iran)
8Department of Soil and Environmental Sciences, The University of Agriculture, Peshawar 25000(Pakistan)
9Soil and Water Management&Crop Nutrition Section, Joint Food and Agriculture Organization(FAO)/International Atomic Energy Agency(IAEA) Division of Nuclear Techniques in Food and Agriculture, Department of Nuclear Sciences and Applications, IAEA, Vienna International Centre, P. O. Box 100, Vienna 1400(Austria) |
| Corresponding Author:Ana Gabriela PÉREZ-CASTILLO |
| ABSTRACT |
| 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. |
| Key Words: ammonia volatilization,Andosol,Costa Rica,field trial,gaseous N loss,greenhouse gas emission,urea |
| Citation: Pérez-Castillo A G, Chinchilla-Soto C, Elizondo-Salazar J A, Barboza R, Kim D G, Müller C, Sanz-Cobena A, Borzouei A, Dawar K, Zaman M. 2021. Nitrification inhibitor nitrapyrin does not affect yield-scaled nitrous oxide emissions in a tropical grassland. Pedosphere. 31(2):265-278. |
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