The degradation of 14C-labelled phosphatidyl choline in soil

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Abstract

When phosphatidyl [N-methyl-14CO]choline or phosphatidyl choline di[l-14C]palmitoyl were incubated in a low phosphorus status soil there was an early and rapid release of CO2 and a concurrent increase in NaHCO3-extractable inorganic phosphorus, indicating mineralization of the added organic phosphorus. Mineraiization slowed dramatically and by 20 days only 50% of the carbon from the molecule was accounted for as microbial biomass or respiration. The rates of release of 14CO2 from the two labelled substrates indicated that 14CO2 measured as respiration initially arose more swiftly from the carbon portion of the molecules with easiest access to enzymic degradation.

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