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Thesis (M.S.)--University of Nebraska--Lincoln, 1961. Department of Agronomy.


Copyright 1961, the author. Used by permission.


A field study was designed to obtain more information on the activity of roots as indicated by the recovery of nitrogen from various depths in the soil. This information should be valuable in predicting the extraction of soil moisture and the utilization of subsoil nutrient reserves at different depths in the soil. The experiment was initiated in 1959 on an established bromegrass field at the Agronomy Farm, Lincoln, Nebraska.

The objectives of the study were: (1) to estimate root activity and distribution in relation to depth and chemical and physical properties of soil; (2) to measure the recovery of nitrogen from various depths in the soil at various times during the growing season; (3) to measure the influence of nitrogen recovery on plant yield composition and; (4) to find the relationship between chemical properties of the soil profile and the chemical composition of bromegrass as influenced by nitrogen placement.

Advisor: Robert L. Fox.