Estimation of the carbon footprint in rice cropping systems can help in identifying the major options available in the quest to reduce greenhouse gas (GHG) emissions in agricultural production. This research study assessed the greenhouse gas emissions of irrigated rice production based on field experiments and surveys. The study determined the effect of application of different nitrogen rates on crop yield, carbon footprint and net carbon in irrigated rice ( Oryza sativa var KRC Baika ) production systems. A three-year (one minor season followed by two major seasons) field experiment was conducted on a Vertisol in a completely randomized design with four nitrogen application rates. Biomass yield and the N content of straw and grain were determined after harvest. Additionally, data on detailed farm activities relative to the cultivation of the rice crop, input use as well as biomass yield were obtained and used to estimate the carbon footprint during the study. The results showed that between 862 and 1717 kg CO 2 -eq ha -1 was emitted from rice fields per season. From this study, nitrogen fertilizer with about 42% of the emissions, was the biggest contributor to total GHG emissions ha -1 of rice crop. Applying nitrogen fertilizer at 90 kg N ha -1 gave a similar yield, but with a lower carbon footprint relative to the application of 135 kg N ha -1 . Therefore, applying N at 90 kg N ha -1 maintained yields, reduced GHG emissions and had a positive net carbon. The results of this study can be applied to ensure that farmers maintain yields with less cost to the environment.
KeywordsGreenhouse GasEmissionsCarbon FootprintNitrogen FertilizerRice Production
Dlugokencky, E.J., Hall, B.D., Montzka, S.A., Dutton, G., Mühle, J. and Elkins, J.W. (2019) Atmospheric Composition [in State of the Climate in 2018, Chapter 2: Global Climate]. Bulletin of the American Meteorological Society, 100, S48-S50. https://doi.org/10.1175/2019BAMSStateoftheClimate.1
IPCC (2007) Climate Change 2007: Mitigation. In: Metz, B., Davidson, O.R., Bosch, P.R., Dave, R. and Meyer, L.A., Eds., Contribution of Working Group III to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Cambridge University Press, Cambridge, New York, 619.
Adler, R.A., Del Grosso, S.J. and Parton, W.J. (2007) Life-Cycle Assessment of Net Greenhouse Gas Flux for Bio-Energy Cropping Systems. Ecological Applications, 17, 666-691. https://doi.org/10.1890/05-2018
St Clair, S., Hiller, J. and Smith, P. (2008) Estimating the Pre-Harvest Greenhouse Gas Costs of Energy Crop Production. Biomass & Bioenergy, 32, 442-452. https://doi.org/10.1016/j.biombioe.2007.11.001
Camargo, G.G.T., Ryan, M.R. and Richard, T.L. (2013) Energy Use and Greenhouse Gas Emissions from Crop Production Using the Farm Energy Analysis Tool. BioScience, 63, 263-273. https://doi.org/10.1525/bio.2013.63.4.6
Squire, G.R., Rodger, S. and Wright, G. (2000) Community-Scale Seed Bank Response to Less Intense Rotation and Reduced Herbicide Input at Three Sites. Annals of Applied Biology, 136, 47-57. https://doi.org/10.1111/j.1744-7348.2000.tb00008.x
Robinson, R.A. and Sutherland, W.J. (2002) Post-War Changes in Arable Farming and Biodiversity in Great Britain. Journal of Applied Ecology, 39, 157-176. https://doi.org/10.1046/j.1365-2664.2002.00695.x
Marshall, E.J.P., Brown, V.K., Boatman, N.D., Lutman, P.J.W., Squire, G.R. and Ward, L.K. (2003) The Role of Weeds in Supporting Biological Diversity within Crop Fields. Weed Research, 43, 77-89. https://doi.org/10.1046/j.1365-3180.2003.00326.x
IPCC (2007) Summary for Policymakers. In: Solomon, S., Qin, D., Manning, M., Chen, Z., Marquis, M., Averyt, K.B., Tignor, M. and Miller, H.L., Eds., Climate Change 2007: The Physical Basis, Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Cambridge University Press, Cambridge, New York, 996.
Zheng, X., Han, S., Huang, Y., Wang, Y. and Wang, M. (2004) Re-Quantifying the Emission Factors Based on Field Measurements and Estimating the Direct N2O Emission from Chinese Croplands. Global Biogeochemical Cycles, 18, 1-19. https://doi.org/10.1029/2003GB002167
Smith, P., et al. (2013). How Much Land-Based Greenhouse Gas Mitigation Can Be Achieved without Compromising Food Security and Environmental Goals? Global Change Biology, 19, 2285-2302. https://doi.org/10.1111/gcb.12160
Eshun, J.F., Apori, S.O. and Wereko, E. (2013) Greenhouse Gaseous Emission and Energy Analysis in Rice Production Systems in Ghana. African Crop Science Journal, 21, 119-125.
Salvagiotti, F. and Miralles, D.J. (2008) Radiation Interception, Biomass Production and Grain Yield as Affected by the Interaction of Nitrogen and Sulfur Fertilization in Wheat. European Journal of Agronomy, 28, 282-290. https://doi.org/10.1016/j.eja.2007.08.002
Ju, X.-T., Xing, G.-X., Chen, X.-P., Zhang, S.-L., Zhang, L.-J., Liu, X.-J., Cui, Z.-L., Yin, B., Christie, P., Zhu, Z.L. and Zhang, F.-S. (2009) Reducing Environmental Risk by Improving N Management in Intensive Chinese Agricultural Systems. PNAS, 106, 3041-3046. https://doi.org/10.1073/pnas.0813417106
Yan, J., Shen, Q.-R., Yin, B. and Wan, X.-J. (2009) Fertilizer-N Uptake and Distribution in Rice Plants Using 15N Tracer Technique. Journal of Nuclear Agricultural Sciences, 23, 487-491.
Cui, Z., Wang, G., Yue, S., Wu, L., Zhang, W., Zhang, F. and Chen, X. (2014) Closing the N-Use Efficiency Gap to Achieve Food and Environmental Security. Environmental Science & Technology, 48, 5780-5787. https://doi.org/10.1021/es5007127
Eze, P.N. (2008) Characterisation, Classification and Pedogenesis of Soils on a Legon Catena, in the Accra Plains, Ghana. Mphil Thesis, University of Ghana, Accra.
Day, P.R. (1965) Fractionation and Particle-Size Analysis. In: Black, C.A., Ed., Methods of Soil Analysis, Agronomy No. 9, Part 1, America Society of Agronomy-Soil Science Society of America, Madison, Volume 9, 545-567. https://doi.org/10.2134/agronmonogr9.1.c43
Walkley, A. and Black, I.A. (1934) An Examination of the Degtjareff Method for Determining Soil Organic Matter, and Proposed Modification of the Chromic Acid Titration Method. Soil Science, 37, 29-38. https://doi.org/10.1097/00010694-193401000-00003
Olsen, S.R. and Watanabe, F.S. (1965) Test of an Ascorbic Acid Method of Determining Phosphorus in Water and NaHCO3 Extracts from the Soil. Soil Science Society of America Journal, 26, 677-678. https://doi.org/10.2136/sssaj1965.03615995002900060025x
Murphy, J. and Riley, J.P. (1962) A Modified Method Single Solution for Determination of Phosphate in Natural Water. Acta Journal of Analytical Chemistry, 27, 31-36. https://doi.org/10.1016/S0003-2670(00)88444-5
Anderson, J.M. and Ingram, J.S.I. (1993) Tropical Soil Biology and Fertility: A Handbook of Methods. CAB International, Wallingford.
IPCC (2006) Guidelines for National Greenhouse Gas Inventories. Agriculture, Forestry and Other Land Use, Vol. 4. Intergovernmental Panel on Climate Change, Paris.
Lal, R. (2004) Carbon Emissions from Farm Operations. Environment International, 30, 981-990. https://doi.org/10.1016/j.envint.2004.03.005
Boustead, I. and Hancock, G.F. (1979) Handbook of Industrial Energy Analysis. Horwood Publishing, Chichester, 422 p.
Fluck, R.C. (1992) Energy in Farm Production. In: Fluck, R.C., Ed., Energy in World Agriculture, 6th Edition, Elsevier, New York, 218-267.
Loomis, R.S. and Lafitte. H.R. (1987) The Carbon Economy of a Maize Crop Exposed to Elevated CO2 Concentrations and Water Stress, as Determined from Elemental Analyses. Field Crops Research, 17, 63-74. https://doi.org/10.1016/0378-4290(87)90083-9
Pinter Jr., P.J., Kimball, B.A., Mauney, J.R., Hendrey, G.R., Lewin, K.F. and Nagy, J. (1994) Effects of Free-Air Carbon Dioxide Enrichment on PAR Absorption and Conversion Efficiency by Cotton. Agricultural and Forest Meteorology, 70, 209-230. https://doi.org/10.1016/0168-1923(94)90059-0
Schwaiger, H. and Zimmer, B. (1995) A Comparison of Fuel Consumption and Greenhouse Gas Emissions from Forest Operations in Europe. In: Solberg, B. and Roihuvo, L., Eds., Environmental Impacts of Forestry and Forest Industry, European Forest Institute, Joensuu, 33-55.
IPCC (1997) Intergovernmental Panel on Climate Change. Third Assessment Report on Climate Change 1997. Cambridge University Press, Cambridge.
Kaushal, A.K., Rana, N.S., Adesh, S., Sachin, N. and Amit, S. (2010) Response of Levels and Split Application of Nitrogen in Green Manured Wetland Rice (Oryza sativa L.). Asian Journal of Agricultural Sciences, 2, 42-46.
Rashid, M., Khan, K.A.R. and Ahmed, Z.A. (1992) Integrated Use of Nutrient in Rice Wheat Cropping System. Proceeding of International Symposium on Paddy Soil, September 1992, 15-10.
Foley, J.A., Ramankutty, N., Brauman, K.A., Cassidy, E.S., Gerber, J.S., Johnston, M., Mueller, N.D., O’Connell, C., Ray, D.K., West, P.C., Balzer, C., Bennett, E.M., Carpenter, S.R., Hill, J., Monfreda, C., Polasky, S., Rockstrom, J., Sheehan, J., Siebert, S., Tilman, D. and Zaks, D.P. (2011) Solutions for a Cultivated Planet. Nature, 478, 337-342. https://doi.org/10.1038/nature10452
Yan, M., Cheng, K., Luo, T., Yan, Y., Pan, G.X. and Rees, R.M. (2015) Carbon Footprint of Grain Crop Production in China-Based on Farm Survey Data. Journal of Cleaner Production, 104, 130-138. https://doi.org/10.1016/j.jclepro.2015.05.058
Zhong, Y.M., Wang, X.P., Yang, J.P., Zhao, X. and Ye, X.Y. (2016) Exploring a Suitable Nitrogen Fertilizer Rate to Reduce Greenhouse Gas Emissions and Ensure Rice Yields in Paddy Fields. Science of the Total Environment, 565, 420-426. https://doi.org/10.1016/j.scitotenv.2016.04.167
Cheng, K., Yan, M., Nayak, D., Pan, G.X., Smith, P., Zheng, J.F. and Zheng, J.W. (2015) Carbon Footprint of Crop Production in China: An Analysis of National Statistics Data. The Journal of Agricultural Science, 153, 422-431. https://doi.org/10.1017/S0021859614000665
Xu, X. and Lan, Y. (2017) Spatial and Temporal Patterns of Carbon Footprints of Grain Crops in China. Journal of Cleaner Production, 146, 218-227. https://doi.org/10.1016/j.jclepro.2016.11.181
Pan, G.X., Li, L.Q., Wu, L.S. and Zhang, X.H. (2004) Storage and Sequestration Potential of Topsoil Organic Carbon in China’s Paddy Soils. Global Change Biology, 10, 79-92. https://doi.org/10.1111/j.1365-2486.2003.00717.x
Powlson, D.S., Whitmore, A.P. and Goulding, K.W.T. (2011) Soil Carbon Sequestration to Mitigate Climate Change: A Critical Re-Examination to Identify the True and the False. European Journal of Soil Science, 62, 42-55. https://doi.org/10.1111/j.1365-2389.2010.01342.x
Carlson, K.M., Gerber, J.S., Mueller, N.D., Herrero, M., Graham, K.G., Donal, M., Brauman, K.A., Havlik, P., O’Connell, C.S., Johnson, J.A., Saatchi, S. and West, P.C. (2017) Greenhouse Gas Emissions Intensity of Global Croplands. Nature Climate Change, 7, 63-67. https://doi.org/10.1038/nclimate3158
Kim, G.W., Jeong, S.T., Kim, P.J. and Gwon, H.S. (2017) Influence of Nitrogen Fertilization on the Net Ecosystem Carbon Budget in a Temperate Mono-Rice Paddy. Geoderma, 306, 58-66. https://doi.org/10.1016/j.geoderma.2017.07.008
Xiao, Y., Xie, G., Lu, C., Ding, X. and Lu, Y. (2005) The Value of Gas Exchange as a Service by Rice Paddies in Suburban Shanghai, PR China. Agriculture, Ecosystems & Environment, 109, 273-283. https://doi.org/10.1016/j.agee.2005.03.016
Velthof, G.L., Kuikman, P.J. and Oenema, O. (2002) Nitrous Oxide Emission from Soils Amended with Residues. Nutrient Cycling in Agroecosystems, 62, 249-261. https://doi.org/10.1023/A:1021259107244