Some physico-chemical relationships found in four erosive soils of the Piedmont Plateau Region
1937
Rogers, H.T.
A study of the profiles of the Iredell, White Store, Helena, and Orange soils was made. These are four highly erosive claypan soils of the Piedmont Plateau Region of the Eastern United States. An analysis of the data obtained in this study reveals some significant relationships between certain physical and chemical properties A correlation coefficient of .923 +/- .0358 was found when hygroscopic water content was correlated with cation exchange capacity. These two properties are more closely related than percentage colloid and cation exchange capacity (correlation coefficient .752 +/- .1O53). This indicates that the ability of soil colloids to hold water against evaporation forces is an accurate measure of their ability to adsorb cations in ionic exchange. A high negative correlation (-.712 +/- .1196) existed between H-ion concentration and percentage base saturation. The data obtained show that there is very little relationship between H-ion concentration and total exchangeable hydrogen in soils with widely different cation exchange capacities. High correlation coefficients obtained for both hygroscopic water and maximum water-holding capacity and hygroscopic water and moisture equivalent show that any one of these values may be calculated from either of the others by means of a constant, with a high degree of accuracy.
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