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- W1996436225 abstract "The mineralization of labelled and indigenous nitrogen was studied in soils of different total nitrogen contents after long periods of equilibration with added labelled ammonium nitrogen but without the addition of a carbohydrate energy source. The changes during incubation were followed in a number of organic nitrogen fractions. In one soil, the effects of leaching, drying and heating treatments before incubation were also determined on each fraction. A substantial mineralization of labelled nitrogen occurred in all soils during incubation. The non-distillable acid-soluble fraction decomposed by a greater percentage than did the other labelled nitrogen fractions in the first stages of incubation and probably contributed most to labelled mineral nitrogen. In the indigenous nitrogen, the acid-insoluble fraction appeared to be the most active as determined by its percentage change, but it could not be identified as the main contributor to mineral nitrogen. The removal of mineral nitrogen by leaching, and drying the soil at 50° or 100°C produced some small effects on the rate of mineralization of the labelled and indigenous nitrogen during subsequent incubation. The proportion of the labelled nitrogen which was mineralized was greater than that of the indigenous nitrogen during the same period, and thus there appeared to be an ‘active’ fraction within the soil nitrogen. In addition, in all the organic fractions the labelled nitrogen underwent a greater percentage change than the indigenous nitrogen and thus it appears that there was an ‘active phase’ within each organic nitrogen fraction." @default.
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- W1996436225 date "1969-09-01" @default.
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- W1996436225 title "The mineralization of nitrogen from some organic fractions in soil" @default.
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- W1996436225 doi "https://doi.org/10.1016/0038-0717(69)90024-8" @default.
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