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Geologic Nitrogen in Pleistocene Loess of Nebraska¹

ABSTRACT

Research into the relationship between fertilizer use and water quality in Nebraska has resulted in the discovery of large quantities of geologic nitrate within the deep loess mantle of southwestern and central Nebraska. The NO₃^– is first encountered at a depth of about 7 m and continues to an unknown depth in excess of 30 m. Nitrate-N values of 25 to 45 ppm characterize the N zone, but values to 87 ppm have been recorded. The NO₃^– exists only under the leveler uplands of the region; however, it is on this plain that rapid development of irrigation is taking place and it has been shown that the NO₃^– has been leached from beneath older irrigation sites on the plain.

Key Words: nitrate • water pollution • irrigation

¹ Published with the approval of the Director as Paper No. 4055 Journal Ser., Nebraska Agric. Exp. Sta., Lincoln, NE 68503. Work reported was supported in part by the Office of Water Resourc. Res., USDI, under P.L. 88-379.

² Research Associate, Instructor, Visiting Associate Professor of Agronomy, Univ. of Nebraska, Lincoln; Senior Agronomist, Hunt-Wesson Foods; and Professor of Agronomy, Univ. of Nebraska, respectively.