Kinetics of Microbial Carbon Mineralization from Soil Incubated Agro-wastes S. A, ABRO, S. I. H. SHAH*, A. A. ABRO, A. Q. MAHAR, G. Q. SHAR Department of Soil Science, Sindh Agriculture University, Tandojam, Pakistan Received 16th

S. A. ABRO, S. I. H. SHAH, A. A. ABRO, A. Q. MAHAR, G. Q. SHAR

Abstract


Carbon mineralization rates of various agro-wastes differ in genetic properties. Decomposition of two surface applied and incorporated crop wheat-maize residues were studied in laboratory incubation trail to determine measure the carbon mineralization with and without phosphorus addition at 23°C for 39 days. It was revealed that residue returning to arable soil increased significantly residue CO2 evolution & emission rates were 33% higher compared to control. With incorporated residues soil emitted more CO2-C than surfaced ones. Further, soil organic carbon levels were increased but more C was sequestered in incorporated treatments than surface applied. Microbial biomass carbon increased with addition of residues where as P application reduced it to some extent at same temperature. The total influx of CO2-C was linearly correlated with time of incubation for both P levels and application ways under controlled environment.

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