Soil Water Retention Curve and Specific Water Capacity for Three Different-Textured Soils
Journal Title: IOSR Journal of Agriculture and Veterinary Science (IOSR-JAVS) - Year 2018, Vol 11, Issue 9
Abstract
A laboratory experiment was carried out to study some hydraulic properties such as soil water retention curve (SWRC), pore size distribution (PSD), and specific water capacity (SWC), for three differenttextured soils (sandy loam (SL), silt loam (SiL), and silt clay loam(SiCL)). The SWRC was estimated, and the equation of van Genuchten was used to determine the best-fit parameter α, n, and m for experimental data of water content- pressure head [θ(h)] which have nonlinear relationship. This study includes an experimental investigation of the effect of soil particles on PSD. The change in water content θ of soil per unit change in pressure head h was used to estimate SWC. The capillary rise equation (Jurin equation) was used to estimate the effective pore diameter (D). The results show that pore space was affected by experimental soil samples. Air pores (>30 μm) increased with increasing sand content at the same time capillary pores filled with water (<30 μm) increased with increasing clay content. The relative of water volume to total soil volume ranged between 0.41 and 0.79 cm 3 cm -3 for soil samples. At pressure head 100 cm the amount of water lost increased with sand content, where soil sample SL lost water more than SiCL by 54%. The percentage of pores (<30 μm) ranged from 41% to 79% and the pores (>30 μm) ranged from 59% to 21%. The parameters of van Genuchten equation considered very important to calculating the SWC from the differential relation, and the amount of retained or lost water has been estimated at various water potential.
Authors and Affiliations
Nameer T. Mahdi
Keywords
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- EP ID EP402426
- DOI 10.9790/2380-1109024349.
- Views 101
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