Abstract
tural classes are based on the proportion of sand, silt and clay in line
earth fraction where as PSC are mainly a function of clay fraction (<0.002 mm) and coarse fraction of 0.1 mm to 75 mm. Computing PSC from textural data is difficult since fine sand (0.05-0.1 mm) is a part of sand fraction which is treated as silt in PSC. and coarse fraction data is also not available. A n attempt was made to arrive at a general correlation between PSC in the control section of soil families from textural class data of 15 pedons of the Indus Plain. The data indicated that sandy loam and loam soils might be placed In loamy PSC because of high sand to very find sand (S to VFS) ratio with mean values of 4.70 and 4.16 respectively. While silty clay and silty clay loam samples would find a palce in fine silty or fine PSC, being rich in silt + clay contents and low sand to very fine sand ratio with mean values of 1.63 and 1.53 respectively. Critical review of silt loam samples revealed that soils with more than 55 percent silt might be placed in silty PSC becausee of having sufficiently low sand to very fine sand ratio. However, presence of lime nodules and iron manganese concretion with grain size of 2-75 mm should be given due consideration. Coarse, fine, and clayey particle size classes can be identified easily because, size of clay fraction in the textural class data is the same.
Malik Raheem Bukhsh * , Shams-ul-Haque. (1988) PARTICLE SIZE CLASSES VERSES TEXTURAL CLASSES - A TENTATIVE CORRELATION, The Journal Soil & Environment , Volume 3, Issue (3-4).
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