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Published online by Cambridge University Press: 27 March 2009
Several factors affecting the electrical conductivity of soil suspensions have been studied leading to the development of a simple and rapid technique for its measurement, and suitable for both moist and air-dry soils.
The possible use of the method in soil fertility studies necessitated examination of the effects of cultivations, manures, crop, meteorological variations, etc., on the conductivity measurements. This involved periodical determinations of initial conductivity (i.e. the specific conductivity of a 1 to 5 aqueous soil suspension determined at 25° C.) and the 7 days’ increase (i.e. the rise in specific conductivity of the same aqueous suspension after standing for 7 days in a thermostat at 25° C.). Soil samples were examined from several Rothamsted classical and nonclassical plots (over twenty plots were investigated for 15–20 months), and samples from experiments were also utilised during two growing seasons.