Micro paddy lysimeter for monitoring solute transport in paddy environment

Thuyet, Dang Quoc, Hien, Thai Quoc, Watanabe, Hirozumi, Saito, Hirotaka, Phong, Thai Khanh, & Nishimura, Taku (2010) Micro paddy lysimeter for monitoring solute transport in paddy environment. Paddy and Water Environment, 8(3), pp. 235-245.

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Abstract

The micro paddy lysimeter (MPL) was developed and evaluated for its performance to simulate solute transport in paddy environment under laboratory conditions. MPLs were constructed using soil collected from Field Museum Honmachi of Tokyo University of Agriculture and Technology, Japan. For the physical characteristics of the hardpan layer, parameters such as thickness, and soil aggregate size, affecting the percolation rate were studied. For the plow layer, two types of plow soils, sieved and un-sieved soils were compared. The sieved soil plow layer was produced by mixing air-dried soils of different aggregate sizes of D > 9.50, 9.50 ≥ D > 4.75, 4.75 ≥ D > 2.0 mm and D ≤ 2.0 mm at 47.1, 19.5, 20.6, and 12.8%, respectively. The un-sieved plow layer soil was directly used after collecting from the field. Inert tracer was applied to ponding water with controlled boundary conditions to evaluate the reproducibility of the soil hydraulic characteristics. HYDRUS-1D was used to evaluate the movement of bromide tracer in the MPL. The proposed conditions of the MPL were that the hardpan layer can be made from soil aggregates smaller than 0.425 mm with 2 cm thickness and that the plow layer can be prepared with sieved or un-sieved soils. With these conditions, the obtained results proved that MPLs can be a useful tool to simulate solute transport in paddy environment.

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ID Code: 89005
Item Type: Journal Article
Refereed: Yes
Keywords: Hardpan, HYDRUS-1D, Micro paddy lysimeter, Paddy field, Plow layer, Solute transport, Tracer
DOI: 10.1007/s10333-010-0204-8
ISSN: 1611-2504
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute of Health and Biomedical Innovation
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 14 Oct 2015 01:56
Last Modified: 23 Oct 2015 03:15

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