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Evaluation of an analytical method for relationship between soil hydraulic diffusivity and sorptivity under zeolite application | ||
| Iran Agricultural Research | ||
| مقاله 1، دوره 39، شماره 2، اسفند 2020، صفحه 1-8 اصل مقاله (751.21 K) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22099/iar.2018.24253.1270 | ||
| نویسندگان | ||
| A. R sepaskhah* ؛ J J. Rahmani-Soghayeh؛ A. Garmsiri | ||
| Department of Water Engineering, College of Agriculture, Shiraz University, Shiraz, I. R. Iran | ||
| چکیده | ||
| 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 0, 4, 8, and 12 g kg-1 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, cm3 cm-3), while maximum value of a and b in sandy loam and silty clay soils, respectively occurred by zeolite application of 8 g kg -1 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 8 g kg-1 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. | ||
| کلیدواژهها | ||
| Hydraulic diffusivity؛ Sorptivity؛ Soil hydraulic parameters؛ Soil conditioner؛ Zeolite | ||
| مراجع | ||
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