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The Representation of Soil Analyses by the Device of Double Plotting

Published online by Cambridge University Press:  27 March 2009

W. Heber Green
Affiliation:
(School of Agriculture, Melbourne University.)

Extract

The usefulness of soil analyses depends largely on the ease with which they may be compared with one another and, to this end, more or less successful attempts have been made to replace the ordinary columns of figures by a suitable graph, so that “he who runs may read.”

Type
Research Article
Copyright
Copyright © Cambridge University Press 1932

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References

1 The “omitted balance” is the percentage of the soil consisting of materials other than the four shown on the graph (in this case materials other than clay, silt, coarse sand and fine sand). The perpendicular distance of the mid-point of the soil line from the diagonal line, when measured on the same scale as the axes, is equal to the omitted balance divided by (or 2·828). It is clear that the mid-point of the soil line must lie on the same side of the diagonal line as the origin.