Korean Journal of Soil Science and Fertilizer (한국토양비료학회지)

Korean Society of Soil Science and Fertilizer (한국토양비료학회)
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Soil Nitrogen Mineralization Influenced by Continuous Application of Livestock Manure Composts

가축분퇴비가 연용된 밭 토양에서 잠재적 질소 무기화량 추정

  • Received : 2010.04.12
  • Accepted : 2010.05.22
  • Published : 2010.06.30
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Abstract

The characteristics of nitrogen mineralization in upland soil was studied with 27-week incubation at $25^{\circ}C$. The used soils in this experiment were received six kinds of livestock manure compost each year for four years. Six different composts, which were chicken (CHM), pig (PIM), and cow (COM) manure composted without bulking agent, and chicken (CHMS), pig (PIMS), and cow (COMS) manure composted with sawdust as a bulking agent, were selected for this study. The first-order model was fit to the observed mineral nitrogen (N) vs incubation days using a non-linear regression procedure. The soil potential for N mineralization (No) of manure compost (CHM, PIM, and COM) treated soils were higher than those of the manure-sawdust compost (CHMS, PIMS, and COMS) treated soils. The No value of PIM applied soil was 15.0 mg 100 $g^{-1}$, which was the highest value among the treatments. The amount of N mineralized in compost applied soils ranged from 8.1% to 11.9% of the total N content in soils and increased with increasing total N content in soils. The organic matter content in compost applied soils were negatively correlated with No value (r = $-0.69^*$). Therefore, our result indicated that determination of N application rate in livestock manure compost applied soil should be based on total nitrogen content better than soil organic matter content.

가축분 퇴비 시용이 토양 중 질소 무기화 특성에 미치는 영향을 구명하기 위해 계분 (CHM), 돈분 (PIM), 우분 (COM), 계분톱밥 (CHMS), 돈분톱밥 (PIMS), 및 우분톱밥 (COMS) 퇴비를 4년간 연용한 밭 토양을 대상으로 27주간 항온시험을 실시하였다. 항온기간 동안 누적 질소 무기화량을 1차 반응 속도식 (first-order kinetics)에 적용하여 잠재적 질소무기화량 (No)을 평가한 결과, PIM 처리구에서 15.0 mg 100 $g^{-1}$으로 가장 높았으며, COMS 처리구에서 9.5 mg 100 $g^{-1}$로 가장 낮았다. 그리고 질소 무기화 속도상수, k는 CHM 0.017 > PIMS 0.016 ${\geq}$ CHMS 0.016 > PIM 0.014 > COM 0.012 ${\geq}$ COMS 0.012 순으로 나타났다. 특히, No 값은 토양 중 전질소 함량이 증가함에 따라 증가하는 경향을 보였고, 이는 토양 중 전질소 함량의 8.1-11.9% 이었다. 그리고 No 값은 토양 유기물 함량과는 음의 상관관계를 보였다. 따라서 톱밥이 혼용된 가축분 퇴비가 장기 연용된 토양에서 유기물 함량을 근거로 산출하는 현재의 질소 시비량 결정 방법은 개선이 필요하다고 판단된다.

Keywords

References

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