Organic acid accumulation under flooded soil conditions in relation to the incorporation of wheat and rice straws with different C:N ratios(Soil Chemistry and Soil Mineralogy)

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概要

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• Crop residues are important agricultural resources and incorporating wheat straw into rice fields is becoming an alternative to open-field burning after wheat harvest in rice-wheat rotation systems. Organic acids are important soil constituents that are believed to be linked to many biological and environmental processes in the soil, including nutrient cycling, phytotoxicity, metal solubility and greenhouse gas formation. A number of studies have focused on the impact of wheat straw incorporation on organic acid accumulation under flooded soil conditions, but information on the relationship between organic acid accumulation and the properties of wheat straw, especially the C:N ratio, and the response of organic acid accumulation to N application is rare. In this study, incubation experiments were conducted to investigate the difference in organic acid (formic, acetic, propionic and butyric acids) accumulation in soil solution under flooded conditions between wheat and rice straw incorporation, and the relationship between the C:N ratio of the straw materials and organic acid accumulation. Results showed that the concentration of organic acids in the soil solution increased with the rate of straw incorporated. The overall accumulation of organic acids was higher when soil was incorporated with wheat straw than with rice straw. The NH_4^+ concentration in soil solution decreased more with wheat straw incorporation because of its higher C:N ratio. The addition of urea-N significantly enhanced CH_4 flux and reduced the concentration of organic acids in soil solution in the wheat straw treatment, whereas CH_4 flux and the concentration of organic acids in the rice straw treatment were less sensitive to the addition of urea-N. The practical implication of the results obtained in this study to N management in rice fields is also discussed.

• 社団法人日本土壌肥料学会の論文

著者

• Han Yong

  Institute Of Soil Science Chinese Academy O F Sciences

• SHAN Yuhua

  College of Environmental Sciences Yangzhou University

• Shan Yuhua

  College Of Environment Sciences And Engineering Yangzhou University

• Johnson Sarah

  International Rice Research Institute

• CAI Zucong

  Institute of Soil Science, Chinese Academy o f Sciences

• BURESH Roland

  International Rice Research Institute

• Cai Zucong

  Institute Of Soil Science Chinese Academy O F Sciences

• Buresh Roland

  International Fertilizer Development Center

関連論文

• Genotypic Differences in Dry Matter Accumulation, Nitrogen Use Efficiency and Harvest Index in Recombinant Inbred Lines of Rice under Hydroponic Culture
• Genotypic differences in grain yield, and nitrogen absorption and utilization in recombinant inbred lines of rice under hydroponic culture(Soil Chemistry and Mineralogy)
• Organic acid accumulation under flooded soil conditions in relation to the incorporation of wheat and rice straws with different C:N ratios(Soil Chemistry and Soil Mineralogy)
• Effect of rice cultivar on CH_4 production potential of rice soil and CH_4 emission in a pot experiment(Soil Chemistry and Mineralogy)
• Evolution and Soil Entrapment of Nitrogen Gases Formed by Denitrification in Flooded Soil
• Mudflat soil amendment by sewage sludge : Soil physicochemical properties, perennial ryegrass growth, and metal uptake(Fertilizers and soil amendments)

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