Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
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Water-dispersible Clay Content in Summer Rainy Season for Korean Irrigated Rice Paddy Fields as Affected by Cultivated Years Using Heavy Agro-machinery and Soil Properties

우리나라 관개논에서 토양특성과 대형농기계를 사용한 경작년수에 따른 여름 강우기 분산성 점토의 함량

  • Han, Kyung Hwa (Soil and Fertilizer Division, Department of Agricultural Environment, National Institute of Agricultural Science, Rural Development Administration)
  • 한경화 (촌진흥청 국립농업과학원 농업환경부 토양비료과)
  • Received : 2018.10.01
  • Accepted : 2018.11.05
  • Published : 2018.12.31
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Abstract

BACKGROUND: This study was conducted to evaluate the water-dispersible clay content of paddy soils over the country in the summer rainy season as affected by cultivated years using heavy agro-machinery and soil properties such as texture and exchangeable sodium percentage. METHODS AND RESULTS: Water-dispersible clay content of 16 soil series of Korean paddy soils over the country were investigated in summer rainy season from July to August, 2006 by Middleton's method. Water-dispersible clay content ranged from non-detected to 4.8%, showing maximum value from the fine textured soils and high clay dispersibility in average from the coarse textured soils. Longer cultivated years using agro-machinery more than 40 hp result in higer water-dispersible clay content for 60% of studied paddy soils with less than 5% of exchangeable sodium percentage (ESP). Exceptionally, soils with relatively big difference of ESP at about 10 percent showed higher water-dispersible clay content with higher ESP. CONCLUSION: Long years of cultivation using agro-machinery with more than 40 hp enhanced water-dispersiblility of clay in approximately 60% of the studied paddy fields except for salt-affected soils.

우리나라 관개논의 여름철 강우기 Middleton's 분산성 점토는 불검출 ~ 4.8%의 범위로 나타났으며 최대값은 점토 함량 18% 이상 토양에서 나타났으나 점토 분산성은 점토 함량 18% 미만 토양에서 높게 나타났다. 대상지역의 60%에서 40마력이상 농기계를 사용한 경작연수가 길수록 분산성 점토 함량이 높은 값을 나타내었다. 단, 치환성 나트륨 함량 퍼센트의 차이가 큰 간척논은 예외로 나트륨함량이 높을수록 분산성 점토가 높았다.

Keywords

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