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Water Soluble Organic Substances Leachable from Feedlot Manure¹

ABSTRACT

Water extracts of feedlot manure and soil and of grassland soil were compared with water from shallow wells near to and remote from feedlots and with water from a local river. Thin-layer and column chromatography failed to reveal water-soluble organics unique to feedlot ground waters. Free phenolics could readily be leached from feedlot manure and from the upper few centimeters of feedlot soil, but only trace amounts of low-molecular-weight organics were encountered in the ground water samples examined. The major organic constituents in all the well waters appeared to be polymerized materials. Mildly reductive degradation of the organic polymers in leachates prepared from feedlot manure, feedlot soil, and grassland soil yielded identifiable phenolics; the same procedure failed to reveal phenolics in ground waters. It was concluded that there is no uniform or continuing movement of organic material from feedlots through the soil profile to the ground water under the feedlot sites involved.

Key Words: phenolics • ground water

¹ Contribution from the Soil and Water Conservation Res. Div., Agr. Res. Serv., Ft. Collins, Colo., 80521, in cooperation with Colorado St. Univ. Exp. Sta., Sci. Ser. No. 1681. This research was supported in part by the Environmental Protection Agency and by NSP Grant no. BG13096.

² Chemist and Microbiologist, respectively, USDA, Ft. Collins, Colo.

³ Visiting Chemist, from the Institute fur Biochemie des Bodens, Forschungsanstalt fur Landwirtschaft, Braunschweig-Volkenrode, Germany.

Received for publication October 18, 1971.