Differences in CO₂and N₂O emission rates following crop residue incorporation with or without field burning: A case study of adzuki bean residue and wheat straw

Abstract

In the context of sustainable soil-quality management and mitigating global warming, the impacts of incorporating raw or field-burned adzuki bean (Vigna angularis (Willd.) Ohwi & Ohashi) and wheat (Triticum aestivum L.) straw residues on carbon dioxide (CO 2 ) and nitrous oxide (N 2 O) emission rates from soil were assessed in an Andosol field in northern Japan. Losses of carbon (C) and nitrogen (N) in residue biomass during field burning were much greater from adzuki bean residue (98.6% of C and 98.1% of N) than from wheat straw (85.3% and 75.3%, respectively). Although we noted considerable inputs of carbon (499 ± 119 kg C ha -1 ) and nitrogen (5.97 ± 0.76 kg N ha -1 ) from burned wheat straw into the soil, neither CO 2 nor N 2 O emission rates from soil (over 210 d) increased significantly after the incorporation of field-burned wheat straw. Thus, the field-burned wheat straw contained organic carbon fractions that were more resistant to decomposition in soil in comparison with the unburned wheat straw. Our results and previously reported rates of CO 2 , methane (CH 4 ) and N 2 O emission during wheat straw burning showed that CO 2 -equivalent greenhouse gas emissions under raw residue incorporation were similar to or slightly higher than those under burned residue incorporation when emission rates were assessed during residue burning and after subsequent soil incorporation. ARTICLE HISTORY

The Burning of Sugarcane Plantation in the Tropics Modifies the Microbial and Enzymatic Processes in Soil and Rhizosphere

“…Our results show that the content of N also decreased in NRS after the first burning and that it remained at the same level after the second burning. This loss of N in the residual biomass by effect of burning in the field was reported by Koga et al (2016), who found that the content of N in the surface soil layer could decrease by up to 75.3% as a result of the burning of wheat straw. A significant factor is the toxic concentration of bicarbonate ions in alkaline soils, which affects the hydrolysis of urea, resulting in an increase in volatilization of 32 to 52% (Sebastian et al 2009).…”

Enhancing Carbon Sequestration Using Organic Amendments and Agricultural Practices

“…Raw adzuki bean (Vigna angularis (Willd.) Ohwi and Ohashi) and wheat (Triticum aestivum L.) straw residues can supply C into fields by 499 ± 119 kg C ha −1 [65]. The Mekong Delta, Vietnam, produces 21 Mt.…”