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• W2740420513 abstract "In a sandy soil containing 15N-labeled active (soluble and easily degradable) and non-labelled passive (recalcitrant) fractions of soil organic matter, the rate of net N mineralization (solubilization) was determined dur- ing a 55-day incubation at 25 ~ 63% water-holding ca- pacity and different levels of soil extracellular-enzyme ac- tivities. The active fraction of soil N was labelled by pre- incubation (at 5 ~ and 74% water-holding capacity for 6 months) of soil amended with 15N-labeled plant mate- rial. Increases in the activity of extracellular-enzymes in soil were induced by the addition of glucose and KH2PO4 at the beginning of the incubation. The results show that the contents of total soluble N (NO~--N + NH~--N + soluble organic N) were significantly higher in glucose-amended soil compared to the unamended soil. The increases in soluble N in soil amended with 1 and 2 mg glucose g-1 dry soil corresponded to a mean rate of net solubilization of 7.9+ 1.4 and 18.8 +0.7 nmol N g-1 dry soil day -~, respectively. The mean rate of net N solubilization (3.6_+ 1.0 nmol N g-1 dry soil day -1) in unamended soil was significantly lower than those of glu- cose amended soils. The content of 15N in total soluble N in soil amended with 2 mg glucose, for example, was di- luted from 3.11___0.08 atom% before the incubation to 2.77 +0.03 atom% after 55 days. This indicates that 89% of soluble-N accumulated in soil by the end of the incuba- tion originated from the active fraction of soil N and the rest, estimated at 11%, originated from the passive frac- tion. The activities of soluble and total proteases as well as the rate of N solubilization in the soil increased with the application of glucose. The activity of these extracel- E Asmar �9 F. Eiland lular enzymes was highly correlated with the rates of net N solubilization. Thus, increases in extracellular-enzyme activities in glucose-amended soils had a priming effect on the solubilization of lSN-labeled active and non-la- beled passive fractions of soil organic N. It seems that the activity of extracellular-enzymes expressed in terms of to- tal and soluble protease activities could be a rate-limiting factor in the processes of soil organic N solubilization." @default.
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• W2740420513 date "1994-01-01" @default.
• W2740420513 modified "2023-09-27" @default.
• W2740420513 title "Effect of extracellular-enzyme activities on solubilization rate of soil organic nitrogen" @default.
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