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Quantitative Prediction of Leaching in Field Soils¹

ABSTRACT

Leaching experiments were conducted under controlled water regime conditions on a variety of soils in the field to study the distribution of certain ions by percolated water. When NH₄, NO₃, and K were leached, their movement was generally in the form of a "normal" distribution. The movement of Mg was not as well defined as the other ions.

Multiple regression equations for predicting the leaching of these ions were developed which utilize the parameters of a normal distribution as the dependent variables and properties of the soil and quantities of percolated water as the independent variables. The R² values for mean movement ranged from 0.92 to 0.97 and those for the standard deviation from 0.56 to 0.91. The principal independent variables were (i) quantity of percolated water, (ii) soil porosity as expressed by the weighted porosity index, (iii) cation exchange capacity, and (iv) the water content at 0.1 bar suction.

¹ Paper no. 2810 of the Journal Series of the North Carolina State University Agr. Exp. Sta., Raleigh, N.C.

² Assistant Professor and Professor of Soils, respectively.

Received for publication February 10, 1969. Accepted for publication December 11, 1969.