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The Movement of Salts from Soils Following Heavy Application of Feedlot Wastes¹

ABSTRACT

The movement of salts from soils following heavy application of feedlot manure was studied. Air-dried manure was formed into three uniform sizes: small (to pass 40-mesh screen), medium (0.9 cm in diameter, 1.2 cm in length), and large (1.8 cm in diameter, 1.8 cm in length). 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 determining EC, pH, Na, K, Ca, Mg, Cl, Fe, Zn, Ni, Mn, and Cu.

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.

Key Words: salinity • manure application • water management

¹ Arizona Agric. Exp. Stn. Paper no. 2868. The report presented here is a portion of the senior author's dissertation submitted to the faculty of the Dep. of Soils, Water and Engineering in partial fulfillment of the requirement for the degree of Doctor of Philosophy at the Univ. of Arizona. This research was supported in part by funds from the Regional Research Technical Project W-124.

² Research Associate and Professors, respectively, Dep. of Soils, Water and Engineering, The Univ. of Arizona, Tucson, AZ 85721.

Received for publication May 10, 1979.