MICROBIAL BIOMASS CARBON AND ORGANIC CARBON FRACTIONS IN PADDY SOIL AS INFLUENCED BY RICE STUBBLE MANAGEMENT

S. NANDI¹*, B.K. MEDHI², R. BARUA³, M. SAIKIA⁴, H. SAIKIA⁵, K.P. BEZBARUAH⁶, P. KAKATI⁷, A. DAS⁸, N. BORAH^9
1Department of Soil Science, Assam Agricultural University, Jorhat, 785013, Assam, India
²Professor (Soil Science), Department of Soil Science, Assam Agricultural University, Jorhat, 785013, Assam, India
³Professor (Soil Science), Department of Soil Science, Assam Agricultural University, Jorhat, 785013, Assam, India
⁴Principal Scientist (Agronomy) and i/c ADR, Directorate of Research (Agri), Assam Agricultural University, Jorhat, 785013, Assam, India
⁵College of Sericulture, Assam Agricultural University, Jorhat, 785013, Assam, India
⁶ADO, Department of Agriculture, Nonoi, Nagaon, 782001, Assam, India
⁷Department of Soil Science, Assam Agricultural University, Jorhat, 785013, Assam, India
⁸Department of Soil Science, Assam Agricultural University, Jorhat, 785013, Assam, India
⁹Professor (Soil Science), College of Horticulture, Assam Agricultural University, Jorhat, 785013, Assam, India
* Corresponding Author : 95survinandi@gmail.com

Received : 01-07-2020     Accepted : 17-07-2020     Published : 30-07-2020
Volume : 12     Issue : 7       Pages : 1871 - 1874
Int J Microbiol Res 12.7 (2020):1871-1874

Keywords : Carbon mineralization, Soil microbial biomass carbon, Rice stubble, Paddy soil
Academic Editor : Kumar D Shiva
Conflict of Interest : None declared
Acknowledgements/Funding : Authors are thankful to Department of Soil Science, Assam Agricultural University, Jorhat, 785013, Assam, India
Author Contribution : All authors equally contributed

A laboratory experiment was conducted during November 2018 to April 2019 to evaluate the effects of rice stubble (RS) management practices on soil organic carbon fractions and microbial biomass carbon in a rice soil through a fifteen weeks incubation period under constant moisture regime. Untreated and glyphosate-yogurt treated rice stubble was either incorporated or left on the surface of soil-filled (15 cm depth on 5 cm sand at the bottom) poly vinyl chloride (PVC) pipe (25 cm long and 8.44 cm diameter), mounted on tray maintaining a constant water depth of 5 cm and incubated for 105 days. The evolution of CO2, organic carbon, easily oxidizable carbon and microbial biomass carbon were monitored periodically during the experiment. Incorporation of untreated rice stubble influenced organic carbon content of soil at ninth and twelfth week of incubation. The easily oxidizable organic carbon in soil was affected neither by incorporation nor glyphosate-yogurt treatment of rice stubble. Soil microbial biomass carbon was influenced only at ninth week of incubation due to incorporation of rice stubble, with or without glyphosate-yogurt treatment.

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