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Comparison of Inorganic Nitrogen Contents of Undisturbed, Cultivated, and Barnyard Soil Profiles in Wisconsin¹

ABSTRACT

In a group of 25 soil profiles, the total content of NO₃-N to a depth of 240 cm was about 55, 230, 165, and 135 kg/ha for the undisturbed, cultivated, poorly-drained, and well-drained barnyard profiles, respectively, and 35, 30, 995, and 240 kg/ha for exchangeable NH₄-N. Similarly, the average concentration of NO₃-N in the soil solution at the 180–240 cm depth was 8, 11, 9, and 11 ppm. The concentration tended to decrease with soil depth, apparently due to plant uptake, denitrification, and microbial immobilization processes. The total content of NO₂-N to the 240-cm depth ranged from 6 to 25 kg/ha.

¹ Contribution from the Departments of Soils and Agricultural Engineering, Univ. of Wisconsin, Madison, Wis. 53706. Published with the approval of the Director, Wis. Agr. Exp. Sta. Part of a dissertation submitted by the senior author in partial fulfillment of the requirements of the Ph.D. degree, Univ. of Wisconsin. Supported in part by U. S. Dept. of Interior OWRR grant 14-01-9991-858.

² Research Assistant, Research Assistant, Professor of Soils, and Professor of Agricultural Engineering, respectively.

Received for publication December 11, 1969. Accepted for publication April 14, 1970.