A multiple-rod TDR probe development with a view to measure water content and electrical conductivity(EC) of surface soil.
| Project/Area Number |
21580299
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Irrigation, drainage and rural engineering/Rural planning
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| Research Institution | Saga University |
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Principal Investigator |
CHO Hiroyuki 佐賀大学, 農学部, 教授 (90136599)
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| Co-Investigator(Kenkyū-buntansha) |
MIYAMOTO Hideki 佐賀大学, 農学部, 准教授 (10423584)
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| Project Period (FY) |
2009 – 2011
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| Project Status |
Completed (Fiscal Year 2011)
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| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2011: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2010: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2009: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | 土壌圏現象 / モニタリング / 水循環 / 農業工学 |
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| Research Abstract |
A multiple-rod TDR probe was developed with a view to measure water content and electrical conductivity(EC) of surface soil. The probe consisted of several three-rod probes in which the outer rods of each three-rod probe were the common electrical earth guides for the adjacent probes. There was thus no extra space between the adjacent three-rod probes. This probe configuration enabled the TDR measurement to extend over a large area in the field. The characteristics of the multiple-rod probe were examined in sand in a container of 1. 1m×0. 81m×0. 20m. First, a one unit of probe consisting of three 1-m long steel rods of 0. 5 cm diameter with a spacing of 10 cm between the rods was tested for its detective performance for water and EC in sand. Then, a multiple-rod probe consisting of seven rods and with the same probe specifications was inserted horizontally in the sand of the container at 10 cm below the surface. The dielectric constant and EC of the sand were measured with during an evaporation test. Since TDR measurement depended on the air volume in the sampling volume of a probe, the unit probe test revealed the dependency of dielectric constant on the insertion depth of the probe. A cubic expression, such as the Topp' s one, provided a good relation between the average water content and dielectric constant of the surface soil. The insertion depth did not however affect the EC measurement. Moreover, the multiple-rod probe, through the evaporation test, accurately measured the change in water content and EC over 0. 88 m^2 in the surface region. Our results thus showed the possibility of extending the multiple-rod TDR measurement system to a larger area to make the remote sensing data more accurate.
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Report
(4 results)
Research Products
(43 results)
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[Presentation] 土壌の塩類化に及ぼす蒸発散と植物のイオン吸収の影響2011
Author(s)
阪本大輔, 高田元気, 野見山綾介, 海老原健二, 佐合悠貴, 安武大輔, 荒木卓哉, 長裕幸, 小林哲夫, 大槻恭一, 北野雅治
Organizer
日本農業気象学会2011年大会
Place of Presentation
鹿児島市
Related Report
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[Presentation] Sustainable control of soil salinity in irrigated crop fields under desertification. 1. Seasonal change in soil salinity of a field in the Yellow River basin2011
Author(s)
Yasutake, D., Kitano, M., Mori, M., Cho, H., Araki, T., Kobayashi, T. and Wang, W.
Organizer
CIGR 2011
Place of Presentation
Tokyo
Related Report
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[Presentation] Sustainable control of soil salinity in irrigated crop fields under desertification. 2. Salt transport driven by roots and proposal for salinity control technologies2011
Author(s)
Kitano, M., Ebihara, K., Takata, M., Sakamoto, D., Sago, Y., Yasutake, D., Mori, M., Cho, H., Araki, T., Kobayashi, T., Wang, W., Wu, Y., Ma, Y., Yamanaka, N. and Otsuki, K.
Organizer
CIGR 2011
Place of Presentation
Tokyo
Related Report
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[Presentation] Sustainable plant production with salinity control in the upper Yellow River basin under desertification2011
Author(s)
Wang, W., Wu, Y., Mori, M., Yasutake, D., Araki, T., Cho, H., Kobayashi, T. and Kitano, M.
Organizer
The 5^<th> International Symposium on the East Asia Environmental Problems EAEP 2011
Place of Presentation
Fukuoka
Related Report
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[Presentation] Seasonal change in soil salinity of irrigated fields in the upper Yellow River basin2011
Author(s)
Yasutake, D., Wang, W., Kobayashi, T., Wu, Y., Araki, T., Cho, H., Mori, M. and Kitano, M.
Organizer
The 5^<th> International Symposium on the East Asia Environmental Problems EAEP 2011
Place of Presentation
Fukuoka
Related Report
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[Presentation] A kinetic model of root ion absorption integrated with evapotranspiration for estimating salt accumulation in crop fields2011
Author(s)
Kitano, M., Ebihara, K., Rakata, M., Sakamoto, D., Sago, Y., Marui, A., Yasutake, D., Mori, M., Cho, H., Araki, T., Kobayashi, T., Wang, W., Wu, Y., Ma, Y., Yamanaka, N. and Otsuki, K.
Organizer
The 5^<th> International Symposium on the East Asia Environmental Problems EAEP 2011
Place of Presentation
Fukuoka
Related Report
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[Presentation] Quantitative monitoring on soil salinization degree in the middle stream of Heihe River basin based on the TM image2011
Author(s)
Wu, Y., Wang, W., Mori, M., Yasutake, D., Cho, H., Kobayashi, T. and Kitano, M.
Organizer
Proceedings of The 5^<th> International Symposium on the East Asia Environmental Problems EAEP 2011
Place of Presentation
Fukuoka
Related Report
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[Presentation] Estimation of evaporation for analyzing the water balance of a field in the Yellow River basin
Author(s)
Mori, M., Wang, W., Kobayashi, T., Cho, H., Yoshikoshi, H., Wu, Y., Yasutake, D. and Kitano, M.
Organizer
during a dormant season
Place of Presentation
China
Related Report
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