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다공 세라믹 컵을 이용한 디지털 토양수분 장력계 개발
Development of a Digital Soil Tensiometer using Porous Ceramic Cups

정인규   (National Institute of Agricultural EngineeringCC0187572  ); 장영창   (Konkuk UniversityUU0000050  ); 김기복   (Safety Metrology Group, Division of Metrology for Quality Life  ); 김용일   (Safety Metrology Group, Division of Metrology for Quality Life  ); 정선옥   (Chungnam National UniversityUU0001302  );
  • 초록

    This study was conducted to develop a 100 kPa soil tensiometer mainly consisted of a porous ceramic cup, water-holding tube, and a digital vacuum gauge, through theoretical design analysis and experimental performance evaluation. Major findings were as follows. 1. Theoretical analysis showed that air entry value of a porous media decreased as the maximum effective size of the pore increased, and the maximum diameter of the pores was $2.9\;{\mu}m$ for measuring up a 100 kPa of soil-water tension. 2. Property analysis of tensiometer porous cups supplied in Korean domestic market indicated that main components were $SiO_2$ and $Al_2O_3$ with a porosity range of $33.8{\sim}49.3%$ . 3. The porous cup selected through sample fabrication and air-permeability tests showed weight ratios of 87% and 11% for $Al_2O_3$ and $SiO_2$ . The analysis of SEM (scanning electron microscope) images showed that the sample was sintered at temperatures of about $1150^{\circ}C$ , which consisted of pores with sizes of up to 25% of those for commercial porous cups. 4. The prototype soil tensiometer was fabricated using the developed porous cup and a digital vacuum gauge that could measure water tension with a pressure of 85 kPa in air tests. 5. In-soil tests of the prototype conducted during a period of 25-day drying showed that soil-water tension values measured with the prototype and commercial units were not significantly different, and soil-water characteristic curves could be established for different soils, confirming accuracy and stability of the prototype.


  • 주제어

    Soil sensor .   Soil water tension .   Tensiometer .   Porous cup.  

  • 참고문헌 (8)

    1. Barber, S. A. 1984. Nutrient uptake by plant roots growing in soil. In Soil Nutrient Bio-availability: A Mechanistic Approach. New York, N.Y.: John Wiley & Sons, Inc 
    2. Stannard, D. I. 1992. Tensiometers-theory, construction, and use. Geotechnical Testing Journal, GTJODJ. 15(1):48-58 
    3. 김철기, 이기춘. 1996. 신고 농업수리학. 향문사 
    4. 이용구,김기덕,남윤일,조얼환,김태영,남은영,문보흠 .2004. 토양수분계측 및 자동관수용 텐시오미터. 대한민국 실용신안 등록번호:20-0354141 
    5. Hillel, D. 1980. Fundamentals of Soil Physics. Academic Press, INC 
    6. 엄기철. 2003. 시설재배지의 관비기술개발 방향. 한국시설원예연구회 제 17회 심포지엄 자료집: 고품질 원예산물 생산 위한 관비재배 현황과 발전방향.pp. 2-15. 한국시설원예연구회, 부산 
    7. Lu, N. and W. J. Likos. 2004. Unsaturated Soil Mechanics. New York, N.Y.: John Wiley & Sons, Inc 
    8. Soil Science Society of America. 2002. Methods of Soil Analysis, Part 4 - Physical Methods, SSSA Book Series, No. 5. pp. 417-669. Soil Science Society of America, Inc., Madison, Wise., USA 

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