KOREAN JOURNAL OF CROP SCIENCE (한국작물학회지)

The Korean Society of Crop Science (한국작물학회)
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Effects of Rice Straw Compost Application on Soil Chemical Properties and Soil Organic Carbon Stock in Paddy Fields

볏짚퇴비 사용이 논토양의 화학성 및 유기탄소 축적에 미치는 영향

  • Ji-Eun Byeon (Soil and Fertilizer Management Division, National Institute of Agricultural Sciences, RDA) ;
  • Seong Heon Kim (Soil and Fertilizer Management Division, National Institute of Agricultural Sciences, RDA) ;
  • Jae Hong Shim (Soil and Fertilizer Management Division, National Institute of Agricultural Sciences, RDA) ;
  • Sang Ho Jeon (Soil and Fertilizer Management Division, National Institute of Agricultural Sciences, RDA) ;
  • Yun Hae Lee (Soil and Fertilizer Management Division, National Institute of Agricultural Sciences, RDA) ;
  • Soon Ik Kwon (Soil and Fertilizer Management Division, National Institute of Agricultural Sciences, RDA)
  • 변지은 (농촌진흥청 국립농업과학원 토양비료과) ;
  • 김성헌 (농촌진흥청 국립농업과학원 토양비료과) ;
  • 심재홍 (농촌진흥청 국립농업과학원 토양비료과) ;
  • 전상호 (농촌진흥청 국립농업과학원 토양비료과) ;
  • 이윤혜 (농촌진흥청 국립농업과학원 토양비료과) ;
  • 권순익 (농촌진흥청 국립농업과학원 토양비료과)
  • Received : 2023.03.23
  • Accepted : 2023.05.02
  • Published : 2023.06.01
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Abstract

The aim of this study was to investigate the effect of application rate of rice straw compost on soil chemical properties and soil organic carbon stock (SOC stock). The experiments were performed with no fertilizer (NF), inorganic fertilizer (NPK), NPK + rice straw compost 7.5 ton ha-1 (NPKC7.5), NPK + rice straw compost 15 ton ha-1 (NPKC15), NPK + rice straw compost 22.5 ton ha-1 (NPKC22.5), and NPK + rice straw compost 30 ton ha-1 (NPKC30). The SOC and SOC stock were highest in the NPKC30 treatment at 22.8 g kg-1 and 71.2 Mg C ha-1, respectively. Rice production was in the range of 621.2-654.4 kg 10a-1 in NPKC22.5 and NPKC30 treatments, which was higher than that in the NPK treatment. However, with increase in compost application, the exchangeable K and Ca of the soil increased, and the exchangeable K and Ca were higher than the optimum range in NPKC22.5 and NPKC30 treatments. Excessive application of compost can have negative impacts on the environment, including nutrient accumulation in the soil and water pollution from nutrient runoff. Therefore, applying the standard amount of compost according to the agricultural environment would be appropriate, despite the relatively lower rice production and SOC stock than that observed with the application of 22.5 and 30 ton ha-1.

본 연구는 볏짚퇴비의 사용량(7.5, 15, 22.5, 30 ton ha-1)이 토양 화학성 및 유기탄소 축적에 미치는 영향을 알아보고자 하였다. 연구결과 NPKC7.5 처리구에서 SOC와 SOC stock이 각각 15.3 g kg-1, 57.8 Mg C ha-1으로 NPKC22.5와 NPKC30 처리구보다 낮았으며, 볏짚퇴비 사용량이 가장 많았던 NPKC30 처리구는 SOC가 22.8 g kg-1, SOC stock이 71.2 Mg C ha-1로 NPKC 22.5처리구와 유의한 차이를 보이지 않았으나 처리구 중 높은 경향을 보여 퇴비 사용량이 많을수록 SOC의 축적이 많아진다는 것을 알 수 있었다. 그러나 교환성 칼륨과 칼슘이 퇴비 사용량이 늘어날수록 높아져 NPKC22.5와 NPKC30 처리구는 적정범위를 초과하였다. 과도한 유기물원 투입은 토양유기탄소 축적을 증가시키더라도 작물에 흡수되지 못한 양분이 수계로 유출되어 수질을 오염시키거나 토양에 축적되어 토양 환경에 악영향을 미칠 수 있으므로 지속적으로 볏짚퇴비를 투입하기 위해서는 토양, 수질 등 농업 환경을 고려하여 표준사용량을 사용하는 것이 적절할 것으로 판단된다.

Keywords

Acknowledgement

본 논문은 농촌진흥청 연구사업(과제번호: PJ017283)의 지원에 의해 이루어진 것임

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