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A Precision Test of Hydrometer Method for Determining Soil Texture  

Kim, Lee-Yul (National Institute of Agricultural Science and Technology)
Han, Kyung-Hwa (National Institute of Agricultural Science and Technology)
Cho, Hyun-Jun (National Institute of Agricultural Science and Technology)
Oh, Dong-Shig (National Institute of Agricultural Science and Technology)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.39, no.5, 2006 , pp. 315-320 More about this Journal
Abstract
A precision test of hydrometer method, used to determine soil texture, was conducted on selected 10 soil samples, compared to pipette method. Soil texture measurements with hydrometer method were performed with monitoring the temperature of soil suspension in settling cylinder. The temperature and its fluctuation during settling time had a range of $13^{\circ}C-28^{\circ}C$ and $0.2^{\circ}C-4.4^{\circ}C$, respectively. The difference of clay content between hydrometer and pipette method were distributed from -6.4% to 4.0%. Positive end of difference in clay content was observed at soil having very low clay content, whereas negative end at soil having high organic matter content and exchangeable cations. Except both ends, difference in clay content of soils was less than 3%, and expecially closed to 0% in soils having clay content more than 25%. The difference of sand content were distributed from -1.5% to 4.2%. Similar to clay content, positive end soil was soil sample having lowest sand content.
Keywords
Soil texture; Hydrometer method; Pipette method;
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