Agriculture Reference
In-Depth Information
Information from each of the individual particle size classes may be integrated by
plotting the data as cumulative curves or on triangular diagrams. Figure I.3a presents such
cumulative plots for the surface horizons of four contrasting soils from Table I.4 (below).
These curves allow a straightforward visual comparison of soil textures whether these
are from different soils, different depths in a single profile or represent spatial variation,
perhaps at different locations down a hillslope. Figure I.3b illustrates the changes in
particle-size distribution that occur with increasing depth in the profile of the tropical
alfisol described by Murtha (1982). The relative similarities of the particle size distribu-
tions of the A and E horizons and the sharp increase in clay content at the top of the B
horizon are clearly illustrated.
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