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Effect of Concentration on Decomposition of Some ¹⁴C-labeled Phenolic Compounds, Benzoic Acid, Glucose, Cellulose, Wheat Straw, and Chlorella Protein in Soil¹

ABSTRACT

The decomposition of ring-¹⁴C-labeled anisic, ferulic, and benzoic acids and of O¹⁴CH₃-labeled ferulic acid at concentrations of 1 to 10,000 ppm and of UL cellulose, glucose, wheat straw and Chlorella protein at 1 – 50,000 ppm was followed in Chino loam (pH 5.6) and San Jacinto sandy loam (pH 8.0) over a 12-week incubation period. A smaller proportion of the ring C of the benzenoid compounds and glucose was evolved as CO₂ from the lower additions than from the higher applications. The range for C loss for ferulic acid was 40 to 79% for the acid soil and 22 to 33% for the alkaline soil as the concentration increased from 1 to 10,000 ppm. Comparable losses for glucose were 47 – 83 and 65 – 81%; for anisic acid 55 – 79 and 49 – 72%; for p-hydroxycinnamic acid 54 – 81 and 21 – 53%; and for benzoic acid 68 – 77 and 50 – 79%. Loss of O¹⁴CH₃ C of ferulic acid and of wheat straw, cellulose, and protein C was not influenced by concentration. Percentage C loss from ring-¹⁴C ferulic and benzoic acids added to initially sterilized and reinoculated acid soil was about 82% and was not influenced by concentration.

¹ Contribution from Dept. of Soil and Environmental Sciences, University of California, Riverside CA 92521, and Institut für Biochemie des Bodens, FAL, Braunschweig, West Germany.

² Professor of Soil Science, University of California, Riverside, and Biochemist, Institut für Biochemie des Bodens, Braunschweig, West Germany, respectively. The authors thank J. O. Ervin and B. Johanson for laboratory help, and H. Lemke for assistance with the synthesis of the ¹⁴C-labeled compounds.

Received for publication February 13, 1979. Accepted for publication April 16, 1979.