Korean Journal of Soil Science and Fertilizer (한국토양비료학회지)

Korean Society of Soil Science and Fertilizer (한국토양비료학회)
권호 표지

Changes of Physical Properties of Soils by Organic Material application

유기성 물질 시용에 따른 농경지 토양물리성 변화 연구

  • Kim, Lee-Yul (National Institute of Agricultural Science and Technology) ;
  • Cho, Hyun-Jun (National Institute of Agricultural Science and Technology) ;
  • Han, Kyung-Hwa (National Institute of Agricultural Science and Technology)
  • Received : 2004.09.02
  • Accepted : 2004.09.30
  • Published : 2004.10.30
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Abstract

The objective of this study was to investigate the effect of organic materials (compost, straw, green manure, pig manure, seed production oil cake, and industrial by products including municipal sewage sludge, industrial sewage sludge, leather processing sludge, and alcohol fermentation processing sludge) on physical properties of soils in seven paddy and four upland fields with differential soil textures, sandy loam, loam, or clay loam, etc. The investigated physical parameters were bulk density (BD), air permeability (AP), macroporosity, hardness, shear resistance, frictional resistance, water stability aggregate (WSA), and Middleton's dispersion ratio. Except for coarse sandy loam field with weak structure, a decrease in BD and shear resistance, and an increase in macroporosity and AP in plots with applying organic materials compared to plots without applying organic materials appeared. In upland fields, the positive effect of organic materials on WSA, BD, and air permeability was higher than in paddy fields. The combined plot of NPK and compost had lower BD, hardness, and shear resistance, and higher macroporosity and WSA than plot with compost. Green manure had higher positive effect on physical properties of soils compared to other organic materials and the extent of positive effect had no significant correlation with soil organic matter content. Of industrial byproducts applied in coarse sandy loam soil under upland condition, municipal sewage sludge and pig manure compost had higher effect on increase of WSA than leather processing sludge and alcohol fermentation processing sludge. Unlike WSA, there were no significant differences between industrial byproduct types in other physical properties. in silty clay loam soil under the upland condition, straw had more positive effect on soil physical parameters than hairy vetch and pig manure. Therefore, different organic materials had differently active effect on physical parameters depending on types of soil and land use. Especially, it could be thought that well-decomposed organic materials have the advantage of an increase in organic matter content, while coarse organic materials of an increase in WSA.

본 연구는 퇴비, 볏짚, 가축분뇨, 산업폐기물 등의 유기성 물질을 시용하는 11개 포장을 대상으로 유기성 물질이 토양물리성에 미치는 영향을 유기성 물질종류 및 연용연수, 토양특성, 토지이용형태 등의 다양한 인자를 고려하여 살펴보고자 수행하였다. 유기성물질 시용에 의해 용적밀도 감소, 통기성증가, 대공극률 증가, 전단저항감소 등의 물리성 개선효과가 나타났으나, 구조가 약한 조사양토에서의 물리성 개선은 뚜렷하지 않았다. 논 토양에서의 퇴비 연용에 따른 토양 유기물 함량은 2.4-3.2% 범위로 우리나라 평지 논토양에서의 최고 유기물함량은 유기물 질과 양에 관계없이 3.2%로 보인다. 5개소 평균 유기물 함량은 무비구 2.10% 퇴비연용구 2.65%로서 퇴비 연용 효과는0.47%에 불과하였고, 평균 입단률 증가는 4.7%, CEC증가량은 $1.5cmol_c\;kg^{-1}$이었다. 논보다 밭에서 무처리와 퇴비구의 유기물함량 및 내수성입단율, 용적밀도, 통기성 등 토양물리성 차이가 더 크게 나타났다. NPK와 퇴비의 혼용구는 퇴비단용구보다 용적밀도, 경도, 전단저항이 낮았고, 대공극률, 내수성입단율은 높아 물리성개선 효과가 퇴비단용구보다 삼요소 혼용구가 양호하였다. 유기성 물질 중 녹비에 의한 물리성개선 효과가 논과 밭에서 뚜렷하였으나 유기물함량의 증가와는 뚜렷한 삼관성을 보이지는 않았다 밭토양에 시용한 유기성 폐기물의 경우 내수성 입단율에서 생활오니, 돈분퇴비구가 공단, 피혁, 주정오니구에 비해 높았다. 유기성 물질 종류별로 토양물리성개선 효과는 각기 다르게 나타났으며 토양유기물 함량 증가는 부숙된 유기물, 토양입단 증가는 거친유기물이 유리하였다. 전통유기물 자원별 토양물리성개선 효과는 볏짚, 퇴비가 높았고 헤어리벳치, 가축분 등이 낮은편이었다.

Keywords

References

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