Effect of Addition Level and Maturity of Rye Tissue on the Decomposition of a Muck Soil1
- G. Stotzky and
- J. L. Mortensen2
A Rifle peat was treated at 3 levels of addition with 54- or 82-day-old rye tissue and incubated in the laboratory for 70 days. The tissue was doubly labeled with C14 and N15 which enabled partitioning the source of evolved CO2 and inorganic N between the tissue and the muck soil.
An increase in the level of tissue addition caused an increase in the amount of C lost from the incubation mixture but increased net C retention. Most rapid decomposition of both the tissue and the soil organic matter occurred during the first 5 days of incubation. After 8 days, decomposition of the soil organic matter exceeded that of the tissue. Priming action was insignificant. The percent C lost from the tissue was essentially the same for all treatments.
Considerable immobilization of inorganic N occurred during the early stages of the incubation period. N mineralized from the soil organic matter was immobilized preferentially. An increase in the level of tissue addition caused an increase in the amount of N mineralized from tissue and a decrease in the amount mineralized from the soil. The percent N mineralized from both sources, however, decreased with an increase in addition levels.
Incorporation of crop residues apparently can be effective in reducing subsidence losses in muck soil.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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