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Solute Movement Through Disturbed and Undisturbed Soil Cores¹

ABSTRACT

Displacement of nitrate and ³⁶Cl through disturbed (reconstituted horizon by horizon) and undisturbed soil profiles of Aberdeen loam and Beotia loam representing strong and moderate soil structure, respectively, were investigated. Each soil core was 30 cm in diameter and at least 80 cm high. Mean water content of the undisturbed soil profile was greater and mean bulk density _b less than the corresponding values for the disturbed cores for each soil. For example, disturbance increased by 0.07 cm³/cm³ for Beotia with a 0.01 g/cm³ decrease in _b; disturbing Aberdeen decreased _b from 1.47 to 1.30 g/cm³ but increased only 0.03 cm³/cm³. The disturbed soils required greater throughout volume of distilled water to displace the solutes and had smaller dispersion coefficients (D) than the undisturbed soils although not even a twofold difference in D was found. For a given effluent sample, relative nitrate concentration was consistently greater than relative ³⁶Cl concentration due to nitrification occurring within both the disturbed and undisturbed soil profiles during the 24-week period.

¹ Contribution from the Dep. of Soils, North Dakota State Univ., Fargo 58102.

² Associate Professor, Assistant in Soils, Associate Professor, and Professor of Soils, respectively.

Received for publication March 8, 1973. Accepted for publication August 31, 1973.