Abstract
Mineralization and redistribution of carbon from14C-labelled oat shoots and [14C(U)] labelled glucose, leucine, acetate and phenylacetate were studied in light loamy sand and medium clay loam under different levels of mineral nutrition. Losses of mineralized14C as CO2 were greater in the sandy soil than in the clay soil. NPK and NPK+Ca fertilization increased the rates of decay of the introduced plant organic matter. Among the small molecular organic compounds glucose was degraded fastest and phenylacetate slowest. Incorporation of radioactive carbon into humus fractions varied and depended on the nature of the compound introduced and on the soil type. Carbon of glucose, phenylacetate and acetate was mainly incorporated into fulvic acids, whereas14C of leucine was almost evenly distributed between humic and fulvic acids and14C of oat residues in fulvic acids and humin fractions. There was significantly higher incorporation of14C into humic acids and lower incorporation into humins in the sandy soil compared to the clay soil. NPK+Ca decreased the conversion of14C from phenylacetate and acetate to bitumens and increased its content in humic acids, particularly in the clay soil. The incorporation of14C from phenylacetate to humins benefitted from mineral fertilization during the first 30 days of the experiment in both soils.
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Nowak, G., Nowak, J. Turnover of14C-labelled oat residues and small molecular organic compounds in two soils under different levels of mineral nutrition. Plant Soil 122, 67–77 (1990). https://doi.org/10.1007/BF02851911
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DOI: https://doi.org/10.1007/BF02851911