Evaluation of an analytical method for relationship between soil hydraulic diffusivity and sorptivity under zeolite application
Publish place: Iran Agricultural Research، Vol: 39، Issue: 2
Publish Year: 1400
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_IAR-39-2_001
تاریخ نمایه سازی: 6 اردیبهشت 1400
Abstract:
ABSTRACT-Zeolite is used to improve the soil hydraulic properties, i.e., soil hydraulic diffusivity (D) and sorptivity (S) that should be determined. A simple method that relates S to D was evaluated by horizontal water absorption experiment in sandy loam, loam and silty clay soils and zeolite application rates of ۰, ۴, ۸, and ۱۲ g kg-۱ soil. Results indicated that zeolite application was not effective on the a and b values of hydraulic diffusivity function (D=aEXP(bθ), θ is the soil water content, cm۳ cm-۳), while maximum value of a and b in sandy loam and silty clay soils, respectively occurred by zeolite application of ۸ g kg -۱ soil. The values of a and b for loam soil were not influenced by zeolite application rates. Sorptivity for sandy loam soil was reduced by zeolite application rate, while minimum value of S for loam and silty clay soils occurred at zeolite application rate of ۸ g kg-۱ soil. It is indicated that indirect determination of S for different soil textures and zeolite application rates were closely similar to the direct determination of S. Therefore, by determination of S value by simple horizontal absorption test at two different initial soil water contents or two different absorption suction heads in tension infiltrometer the values of Ds and α for hydraulic diffusivity function (D=Dsθα) can be estimated.
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Authors
Alireza sepaskhah
Department of Water Engineering, College of Agriculture, Shiraz University, Shiraz, I. R. Iran
J. J. Rahmani-Soghayeh
Department of Water Engineering, College of Agriculture, Shiraz University, Shiraz, I. R. Iran
A. Garmsiri
Department of Water Engineering, College of Agriculture, Shiraz University, Shiraz, I. R. Iran
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