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Carbon footprint of rice production under organic and conventional fertilization modes.

ZHU Feng-ting1, LI Ao1, YU Xiao-man1, MENG Bo1, BAI Jin-heng1, WANG Hou-xin2, LIU Ming-da1*, MA Dian-rong3*   

  1. (1College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China; 2Tieling Environmental Protection Monitoring Station, Tieling 112000, Liaoning, China; 3Rice Research Institute, Shenyang Agricultural University, Shenyang 110866, China)
  • Online:2020-07-10 Published:2021-01-09

Abstract: To clarify the effects of organic manure on carbon footprint of rice production, a field experiment was conducted with four treatments: pig manure (ZM), cow dung (NM), chicken manure (JM), and chemical fertilizer (CF) as a control. Life cycle assessment was used to evaluate carbon emissions from paddy systems, carbon sequestration, carbon footprint of rice production, and carbon footprint per unit yield. The results showed that greenhouse gases emission during rice planting was the main source of carbon emission in paddy fields. Carbon emission of rice fields was stimulated by the application of organic manure. Compared with CF, carbon emissions under ZM, NM, and JM treatments were increased by 34%, 30%, and 65% respectively. CO2emission during the process of rice planting made the most contribution to carbon emission in rice fields across all treatments. The positive environmental effect was higher under the treatments with organic manure than under that with chemical fertilizer application, with the increases of carbon sequestrations under ZM, NM, and JM treatments being 2.3, 2.8, and 1.9 times higher than that of CF treatment, respectively, which could offset 76%, 92%, and 55% of carbon emissions. The effects of organic manure application on carbon footprint of rice production varied with the types of organic manure, and all of them decreased carbon footprint per unit yield compared to CF treatment, with a decrease of 55%, 83% and 22% under ZM, NM and JM treatments, respectively. With a full consideration of poultry manure treatment, fertilizer production and management, as well as carbon emissions during rice planting and rice yield, we conclude that organic fertilization is beneficial to reducing carbon footprint per unit yield of rice, with best performance of cow dung treatment.

Key words: tea cultivation, specialization, geographically weighted regression, Anxi County., location