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Study on TDR method : Measuring limitation and its applications

Research Project

Project/Area Number 10460110
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Irrigation, drainage and rural engineering/Rural planning
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

CHIKUSHI Jiro  Biotron Institute, Kyushu University, Prof., 生物環境調節センター, 教授 (00127458)

Co-Investigator(Kenkyū-buntansha) OHTSUBO Masami  Faculty of Agr., Kyushu University, Prof., 大学院・農学研究院, 教授 (80112316)
KOBAYASHI Tetsuo  Faculty of Agr., Kyushu University, Ass. Prof., 大学院・農学研究院, 助教授 (20032576)
NAKANO Yoshisuke  Faculty of Agr., Kyushu University, Prof., 大学院・農学研究院, 教授 (60038320)
YAHATA Hisashi  Inst Of Tropical Agr., Kyushu University, Prof., 熱帯農学研究センター, 教授 (90038290)
HIROTA Osamu  Inst Of Tropical Agr., Kyushu University, Prof., 熱帯農学研究センター, 教授 (60038289)
Project Period (FY) 1998 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥13,800,000 (Direct Cost: ¥13,800,000)
Fiscal Year 2001: ¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2000: ¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1999: ¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 1998: ¥4,900,000 (Direct Cost: ¥4,900,000)
KeywordsTDR / Soil water / Dielectric constant / Volcanic soil / Moisture sensor / Irrigation / Electrical conductivity / Mixing model / 火山伝導率 / 水収支
Research Abstract

The objectives of this study are to investigate the limitation of the TDR method to various soils, to examine the length of TDR probe, and to develop the application of the method We obtained the following results.
1. A review of the TDR method disclosed various problems in terms of soil water measurements.
2. Calibration experiments were conducted for three representative field soils in Kyushu Island. The results showed that the estimation by Topp's equation underestimates soil water content for smaller soil bulk density, and that the Maxwell-De Loor model as calibration equation can be successfully applied for different soils.
3. A new type of TDR probe was designed using electrical circuit board. Calibration of the probe demonstrated its effectiveness in both dry and wet soil.
4. Multiple length TDR probes of metal rods were employed to measure soil water content at different depths. The method was found to be applicable to determine the features of soil water distribution in field.
5. Based on the fuzzy theory, we tried water saving control in a drip irrigation experimented in a dry land, and demonstrated the validity of the technique.
6. Both soil water content and electrical conductivity were measured using TDR method for glass beads and sand soil. It was found that water content is higher in salt water condition than in distilled water condition, and that the Topp's equation excellently estimates soil electrical conductivity.
7. The application of TDR method made it clear that the shading effect is independent of soil water content in mungbean cultivation, and that the water use efficiency is high in intercropping system.

Report

(5 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • Research Products

    (37 results)

All Other

All Publications (37 results)

  • [Publications] 筑紫 二郎: "TDR水分計の応用と問題点"平成10年度農業土木学会九州支部シンポジウム「不飽和土壌中における水分・溶質の動態」. 1-17 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] J.Chikushi: "Fuzzy control for water saving in drip irrigation"3^<rd> IFAC/CIGR Workshop on 'Artificial Intelligent in Agriculture' Makuhari, Japan. 60-65 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Haraguchi: "Time domain reflectometry soil moisture content measurement for irrigation"11^<th> Congress of the IAHR-APD Yogjakarta, Indonesia. 129-137 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] J.Chikushi: "Calibration of serpentine type TDR probe"Annual Meeting Abstracts of ASA, CSSA, SSSA, Salt Lake City. USA. 187-187 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 宮本 輝仁: "土壌の体積含水率-比誘電率関係への混合誘電特性モデルの適用"農業土木学会論文集. 206. 57-62 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] J.Chikushi: "TDR Techniques for measuring soil water content"the 9^<th> international joint seminar "Recent advances in agricultural science", Chungnam National University, Korea. 35-49 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] W.Wang: "Measuring the layer-average volumetric water content in the uppermost 5cm of soil using circuit board TDR probe"J. Fac. Agric., Kyushu Univ.. 45(1). 277-287 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] W.Wang: "A comparison experiment of two types of printed circuit board TDR probes"J. Fac. Agr., Kyushu Univ.. 46(1). 15-22 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Miyamoto: "Applicability of multiple length TDR probes to measure water distributions in an Andisol under different tillage systems in Japan"Soil & Tillage Research. 60. 91-99 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 原口 智和: "TDR法による多孔質体内水溶液の電気伝導度測定の関する基礎的研究"九州大学農学部学芸雑誌. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] F.Ahmd: "Growth characteristics and yield of mungbean varieties under different shading conditions"J. Fac. Agr., Kyushu Univ.. (in press).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] F.Ahmd: "Studies on growth, water use efficiency and light interception in maize-mungbean intercropping"J. Fac. Agr., Kyushu Univ.. (in press).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] J. Chikushi: "Application and problems on measurements of soil water content using TDR method (in Japanese)"Proc. of the symposium by the Kyushu branch of JS.I.D.R.E.. 1-17 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] J. Chikushi: "Fuzzy control for water saving in drip irrigation"In 'Artificial Intellignce in Agriculture', edited by T. Kozai et al., 60-65, 1998 IFAC, Pergamon Press, Oxford, UK.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Haraguchi, Y. Nakano, and M. Kuroda: "Time domain reflectometry soil moisture content measurements for imigation"Congress of the IAHR-APD, 11th, Yogiakarta, Indonesia. 129-137 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] J. Chikushi, T. Miyamoto, and H. Cho: "Calibration of serpentine type TDR probe"Annual Meeting Abstracts of ASA CSSA, SSSA, Salt Lake City, USA. 187 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Miyamoto, and J. Chikushi: "Relations between soil water content And apparent dielectric constant evaluated by dielectric mixing Models (in Japanese)"Trans. JSIDRE. 206. 57-62 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] J. Chikushi: "TDR Techniques for measuring soil water content"The 9^<th> international joint seminar "Recent advances in agricultural science", Chungnam National University, Korea. 35-49 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] W. Wang, T. Kobayashi, and J. Chikushi: "Measuring the layer-average volumetric water content in the uppermost 5 cm of soil using circuit board TDR probe"J. Fac. Agric., Kyushu Univ.. 45(1). 277-287 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] W. Wang, T. Kobayashi, H. Cho, and J. Chikushi: "A comparison experiment of two types of printed circuit board TDR probes"J. Fac. Agr., Kyushu Univ.. 46(1). 15-22 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Miyamoto, R. Kobayashi, T. Annaka, and J. Chikushi: "Applicability of multiple length TDR probes to measure water distributions in an Andisol under different tillage systems in Japan"Soil & Tillage Research. 60. 91-99 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] F. Ahmd and O. Hirota: "Studies on growth, water use efficiency and light interception in maize-mungbean intercropping"J. Fac. Agr., Kyushu Univ.. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] F. Ahmd, O. Hirota, Y. Yamada, and Md. A. Rahman: "Growth characteristics and yield of mungbean varieties under different shading conditions"J. Fac. Agr., Kyushu Univ.. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Haraguchi, O. Hirota, Y. Nakano, and T. Funakoshi: "Fundamental study on the measurement of electrical conductivity in porous media using the TDR method (in Japanese)"Sci. Bull. Fac. Agric. Kyushu Univ.. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] W.Wang: "A comparison experiment of two types of printed circuit board TDR probes"J. Fac.Agr., Kyushu Univ.. 46(1). 15-22 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Miyamoto: "Applicability of multiple length TDR probes to measure water distributions in an Andisol under different tillage systems in Japan"Soil & Tillage Research. 60. 91-99 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 原口智和: "TDR法による多孔質体内水溶液の電気伝導度測定に関する基礎的研究"九州大学農学部学芸雑誌. (印刷中).

    • Related Report
      2001 Annual Research Report
  • [Publications] F.Ahmd: "Growth characteristics and yield of mungbean varieties under different shading conditions"J.Fac.Agr., Kyushu Univ.. (in press).

    • Related Report
      2001 Annual Research Report
  • [Publications] F.Ahmd: "Studies on growth, water use efficiency and light interception in maize-mungbean intercropping"J.Fac.Agr., Kyushu Univ.. (in press).

    • Related Report
      2001 Annual Research Report
  • [Publications] 宮本輝仁: "土壌の体積含水率-比誘電率関係への混合誘電特性モデルの適用"農業土木学会論文集. 206. 57-62 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] J.Chikushi: "TDR Techniques for measuring soil water content"The 9^<th> international joint seminar "Recent advances in agricultural science", Chungnam National University, Korea. 35-49 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] W.Wang: "Measuring the layer-average volumetric water content in the uppermost 5 cm of soil using circuit board TDR probe."J.Fac.Agric.,Kyushu Univ.. 45(1). 277-287 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] J. Chikushi: "Calibration of serpentine type TDR probe."Annual Meeting Abstracts of ASA, CSSA, SSSA., Salt Lake City, USA. 187 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 宮本輝仁: "土壌の体積含水率-比誘電率関係への混合誘電特性モデルの適用"農業土木学会論文集. (印刷中). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] J.Chikushi: "Fuzzy Control for water saving in drip irrigation." 3^<rd> IFAC/CIGR Workshop. 60-65 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Haraguchi,Y.Nakano,and M.Kuroda: "Time domain reflectometry soil moisture content measurement for irrigation." Congress of the IAHR-APD, 11^<th>. 129-137 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 筑紫 二郎: "TDR水分計の応用と問題点" 平成10年度農業土木学会九州支部シンポジウム. 1-17 (1998)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2021-09-21  

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