Excerpt from Methods of Physical and Chemical Soil Analysis
That the introduction of the grain-sizes coarser than mm. Can as a rule serve no useful purpose in the chemical analysis of soils in the humid region is strikingly shown in the investigation made by R. H. Loughridge, in 1873 (am. J. Sci., Jan. 1874, p. He found that in the case of a very generalized soil of the Mississippi uplands, solution by strong acid practically ceased beyond the sediment of mm. Hydraulic value, cor responding to a diameter of about mm. Although the general applicability of this particular limit may be fairly questioned, the wide margins between the fractions and renders it pretty certain that within the limit of the former we shall find all that is of any value to plants for their supply of mineral plant food. But for the sake of comparability with analyses made under a different rule, the grain-sizes of to 1 and 1 to 2 mm. Diameter should always be quantitatively determined.
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