THE INFLUENCE OF CULTIVATION ON THE DISTRIBUTION OF NITROGEN IN SOILS OF THE USTOLL SUBORDER
- 30 November 1977
- journal article
- research article
- Published by Wolters Kluwer Health in Soil Science
- Vol. 124 (6), 334-342
- https://doi.org/10.1097/00010694-197712000-00005
Abstract
Four pairs of matched virgin and cultivated Ustoll profiles were analyzed for organic C, total N, nonhydrolyzable N, hydrolyzable NH4+-N, hexosamine N, and alpha amino acid N to determine the distribution of these fractions throughout the profile and the changes that occur in the distribution upon cultivation. The data demonstrated that the effects of cultivation on soil N and C contents can be detected to depths of more than 120 cm in soils of the Ustoll suborder. Losses of organic C and total N upon cultivation were greatest in the surface and decreased with increasing soil depth. An increase in organic C and total N occurred in the deepest portions of three of the four cultivated soils, compared to the virgin counterparts. The concentrations of the four organic N fractions also decreased with depth. The proportion of hexosamine N and amino acid N remained constant with depth, however, while the proportion of hydrolyzable NH4+-N increased with depth, and the proportion of nonhydrolyzable N decreased with depth. Cultivation decreased the concentrations of all four N fractions. It also decreased the proportions of total N that were nonhydrolyzable N and amino acid N, but it increased the proportion of hydrolyzable NH4+-N. © Williams & Wilkins 1977. All Rights Reserved.Keywords
This publication has 3 references indexed in Scilit:
- Inorganic Forms of NitrogenPublished by Wiley ,2016
- The Effect of Cultivation and Erosion on the Nitrogen and Carbon of Some Kansas Soils1Agronomy Journal, 1939
- 3. Organic Matter Problems Under Dryfarming Conditions1Agronomy Journal, 1929