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2023 Vol.56, Issue 4 Preview Page

Original research article

Effects of Rice Straw Return on Soil Labile Organic Carbon and β-Glucosidase Activity in Paddy Soil
So-Hye Choi1
,
So-Hui Kim2
,
Jeong-Ah Jeong3
,
Sang-Min Lee4
,
Cho-Rong Lee5*
1Researcher, Environmentally Friendly Agriculture Division, Chungcheongnam-do Agricultural Research and Extension Services, Yesan 32418, Korea
2Post-Master Researcher, Organic Agriculture Division, Department of Agricultural Environment, National Institute of Agricultural Sciences, RDA, Wanju 55365, Korea
3Researcher Assistant, Organic Agriculture Division, Department of Agricultural Environment, National Institute of Agricultural Sciences, RDA, Wanju 55365, Korea
4Senior Researcher, Organic Agriculture Division, Department of Agricultural Environment, National Institute of Agricultural Sciences, RDA, Wanju 55365, Korea
5Researcher, Organic Agriculture Division, Department of Agricultural Environment, National Institute of Agricultural Sciences, RDA, Wanju 55365, Korea
*Corresponding Author
30 November 2023. pp. 431-439
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Abstract

Rice straw is a source of organic matter (OM) that improves soil fertility. After rice straw is returned to the soil, increased microbial enzyme activity decomposes organic residues, affecting soil carbon. To evaluate the effects of continuous rice straw return on soil labile organic carbon (LOC) fraction and β-glucosidase (BG) activity in paddy soil, an experiment was conducted with four treatments; Chemical fertilizer treatment (NPK), Chemical fertilizer + rice straw treatment (NPKR), Green manure treatment (GM) and Green manure + rice straw treatment (GMR). Hot water extractable carbon (HWEC) content, permanganate oxidizable carbon (POXC) content, and BG activity were analyzed. HWEC content was 42% higher than in NPKR than in NPK. It was 8% higher in GMR than in GM, but there was no significant difference. In addition, POXC content was 17% higher in NPKR than in NPK. It was 11% higher than in GMR than in GM, but there was no significant difference. BG activity was 36% higher in NPKR than NPK, and 55% higher in GMR than GM. As a result, in paddy soil that are low in OM due to the predominant use of chemical fertilizers, rice straw return is likely to increase OM supply and LOC content in the soil and contribute to carbon cycling.

Content of HWEC, POXC, and BG activity in paddy soil between NPK (chemical fertilizer treatment) and NPKR (chemical fertilizer + rice straw treatment). Vertical bars represent standard deviations (n = 3) and symbol * indicates significant difference at p ≤ 0.05.
Keywords
Carbon cycle
Organic farming
Organic matter
Soil enzyme activity
Soil quality
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Information
  • Publisher :Korean Society of Soil Science and Fertilizer
  • Publisher(Ko) :한국토양비료학회
  • Journal Title :Korean Journal of Soil Science and Fertilizer
  • Journal Title(Ko) :한국토양비료학회 학회지
  • Volume : 56
  • No :4
  • Pages :431-439
  • Received Date : 2023-10-23
  • Revised Date : 2023-11-27
  • Accepted Date : 2023-11-30
  • DOI :https://doi.org/10.7745/KJSSF.2023.56.4.431
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