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Thesis (M.S.)—University of Nebraska—Lincoln, 1948. Department of Agronomy.


Copyright 1948, the author. Used by permission.


This investigation was undertaken to determine the methods best suited for the routine measurement of the reaction of Nebraska soils. The investigation includes: 1) a comparison of the results obtained with various commercial instruments using the hydrogen electrode as the standard method. Also included are the results obtained with the quinhydrone and colorimetric methods. 2) A study of the laboratory controllable factors; such as dilution, variation in sample size, time lapse between preparation of sample and reading, and an attempt to evaluate the soil paste method.

The results of tests made in this investigation on some Nebraska soils agree with the findings of other studies and indicate that the use of a soil paste prepared at a low moisture content, for the determination of pH, is most indicative of actual field pH conditions.

Advisor: Leon Chesnin.