Influx of CO2 from Soil Incubated Organic Residues at Constant Temperature

Abstract

Temperature induced CO₂ from genotypic residue substances is still less understood. Two types of organic residues (wheat- maize) were incubated at a constant temperature (25°C) to determine the rate and cumulative influx of CO₂ in laboratory experiment for 40 days. Further, the effect of surface and incorporated crop residues with and without phosphorus addition was also studied. Results revealed that mixing of crop residues increased CO₂-C evolution significantly & emission rare was 37% higher than that of control. At constant temperature, soil mixed residues, had higher emission rates CO₂-C than the residues superimposed. There was linear correlation of CO₂-C influxed for phosphorus levels and residue application ways with entire incubation at constant temperature. The mixing of organic residues to soil enhanced soil organic carbon levels and biomass of microbially bound N; however to little degree ammonium (NH4-N) and nitrate NO₃-N nitrogen were decreased.