The decomposition of ring‐ 14 C‐labeled anisic, ferulic, and benzoic acids and of O 14 CH 3 ‐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 CO 2 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 O 14 CH 3 C of ferulic acid and of wheat straw, cellulose, and protein C was not influenced by concentration. Percentage C loss from ring‐ 14 C ferulic and benzoic acids added to initially sterilized and reinoculated acid soil was about 82% and was not influenced by concentration.
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Martín et al. (1979) studied this question.