THE MOVEMENT OF SALTS FROM SOILS FOLLOWING HEAVY APPLICATION OF FEEDLOT WASTES

Air-dried manure was formed into three uniform sizes, and plastic cylinders of 15 cm inside diameter were packed with 30 cm of a mixture of Anthony sandy loam and manure aggregates over a 10-cm depth of soil. The manure application rate was equivalent to 100 metric tons/ha. Deionized water was passed through the soil column either as a continuous or an intermittent water application. Leachates were collected in one-half of a pore volume increments for chemical analysis. Results were compared with an earlier study for a manure-water system. Sodium and K replaced Ca and Mg on the soil exchange sites and their movement was consequently delayed compared to the earlier results. Chloride movement resembled that of leaching manure alone. Movement of trace elements from the system was not significant.