EFFECT OF EXTERNAL AND INTERNAL NITROGEN ON MINERALIZATION RATE OF CORN RESIDUES
Abstract
The impact of external and internal nitrogen on plant residues decomposition was studied in a series of long-term laboratory incubation experiments. Experiment A was conducted with corn leaves with variable C:N ratios 22, 34, 47 and 62. C:N ratios in Experiments B and C were adjusted to 47, 32, 22 and 10 by adding NH4NO3 (Experiment B) or KNO3 (Experiment C) to corn residues with initial &N ratio of 62. Mineralization rates of labile and recalcitrant carbon pools of plant residues were estimated by kinetics of cumulative CO losses during one-year-long incubation simulated by the double exponential decay function. The internal organic nitrogen was shown to effect the decay constant of the labile pool only, while the internal inorganic N had impact on the labile pool size as well. Also, KNO3 as an external N form influenced both k value and the labile pool size. NH4NO3 affected all the parameters of the double exponential decay model including second decay constant (k ) of recalcitrant pool. Thus, mineralization of plant residues depends significantly both on concentration and form of available nitrogen.
About the Authors
K. Kvitkina Anna
Institute of Physicochemical and Biological Problems in Soil Science of RAS (IPCBPSS RAS)
Kazakhstan
Kazakhstan
A. Larionova Alla
Institute of Physicochemical and Biological Problems in Soil Science of RAS (IPCBPSS RAS)
Kazakhstan
Kazakhstan
S. Bykhovets Sergei
Institute of Physicochemical and Biological Problems in Soil Science of RAS (IPCBPSS RAS)
Kazakhstan
Kazakhstan
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Review
For citations:
Anna K.K., Alla A.L., Sergei S.B. EFFECT OF EXTERNAL AND INTERNAL NITROGEN ON MINERALIZATION RATE OF CORN RESIDUES. Soil Science and Agrichemistry. 2014;(4):31-39. (In Russ.)
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