The Influence of Different Cropping Schemes on the Amino Acid Content, Total Nitrogen, and Total Organic Carbon Content of Soil
Abstract
Total nitrogen and carbon, pH values, alpha-amino nitro- gen, and content of individual amino acids were determined on Chalmers silty clay loam plots cropped for periods varying from 1 to 7 years to alfalfa, bromegrass, and corn. The plots were initially limed to an approximate pi value of 6.5 and adequately fertilized with phosphorus and potassium.During the course of the experiment all plots were fertilized annually with. phosphorus and potassium fertilizers. Corn and bromegrass received a yearly application of 200 pounds of nitrogenous fertilizers.Total carbon was determined by the Van Slyke-Folch procedure, alpha-amino nitrogen by the Van Slyke method, and individual amino acids by gradient elution from an exchange. resin column.After seven years of continuous cropping to alfalfa, bromegrass, and corn, soils had a nitrogen content of 0.31, 0.29, and 0.27% respectively.
Degree
Ph.D.
Subject Area
Agriculture
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