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- W2008347855 abstract "Aerobic long-term incubations (40-wk) were employed to measure the potentially mineralizable nitrogen (N0) in five 30-yr old cropping systems. The cropping systems consisted of: (1) bare fallow; (2) cropping with no additions; (3) cropping with 80 kg N ha−1 y−1 as Ca(NO3)2; (4) cropping with 80 kg N ha−1 yr−1 as Ca(NO3)2 plus 1800kg C ha−1 yr−1 as straw; and (5) cropping with 80 kg N ha−1 yr−1 plus 1800 kg C ha−1 yr−1 as farmyard manure. The amounts of N mineralized during the 40-wk incubations were between 93 and 168 μg g−1 (302–543 kg N ha−1 down to 25cm depth) with the lowest value for the fallow and the highest for the farmyard manure treatment. Microbial biomass-C and -N were measured on four occasions during the incubations. The biomass-C showed a rapid decrease to week 4 (to 36% of the initial mass), a slower decrease to week 9 (to 23% of initial mass) and a very slow decline to the final determination at the end of the incubation (to 8% of initial mass). The biomass-N displayed a similar pattern. Two related models were employed to describe the kinetics of N-mineralization during incubation: (1) a two-component first-order; and (2) a simplified special case of the two-component model. In all cases except the straw-amended soil, the simplified two-component model offered the best description of the curves of accumulated mineral-N. The available fraction, Na, of soil organic-N had mineralization rate constants similar to those for mineralization of microbial biomass." @default.
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- W2008347855 date "1988-01-01" @default.
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- W2008347855 title "Microbial biomass as a fraction of potentially mineralizable nitrogen in soils from long-term field experiments" @default.
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- W2008347855 doi "https://doi.org/10.1016/0038-0717(88)90056-9" @default.
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