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Effects of Long-Time Cropping on Hydrolyzable Organic Nitrogen Fractions in Some Great Plains Soils¹

ABSTRACT

Virgin soils and their long-time cropped counterparts were hydrolyzed with HCl. The N separated into three fractions. The proportion of N that each N fraction contributed to the total N was altered when comparisons were made between virgin soils and their cropped counterparts. Cultivation and cropping caused losses in all three N fractions, however, the nondistillable acid-soluble N fraction lost a greater proportion of its N than did the other two fractions.

¹ Contribution from the Soil and Water Conservation Research Division, ARS, USDA, in cooperation with the Colorado Agr. Exp. Sta., Ft. Collins. Scientific Journal series 887.

² Soil Scientists, ARS, USDA, Fort Collins, Colo.; and Soil Scientist, ARS, USDA, Mandan, N. Dak., respectively.

Received for publication October 28, 1963. Accepted for publication February 3, 1964.