Excerpt from Journal of the Washington Academy of Sciences, 1916, Vol. 6
A study of the results for each soil obtained by the use of the various indicators and by the electrometric method shows that the agreement between the two indicators is very good except in one instance ... (n o. And that the agreement between the colorimetric and the electro metric methods is good in every case. Such agreements show that the two methods give comparable results and give ground for inferring that such results are approximately correct.
It would seem premature at this time to apply the results obtained in this way to the soil as it exists in the field, since carbon dioxide is lost during the drying and the natural soil solution is diluted for the determinations. Nevertheless it may well happen that the errors so introduced (from a field standpoint) are not great enough to obscure the differences observable between different soils. Further work will be required to ascertain whether this is the case.
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