RICE STUBBLE DECOMPOSITION BY CELLULOSE DEGRADING MICROBE AND YOGURT WITH GLYPHOSATE UNDER RAINFED UPLAND ECOSYSTEM

NILAY BORAH¹*, R. BARUA², P.K. PATHAK³, I.C. BARUA⁴, K. HAZARIKA⁵, A. PHUKAN^6
1Department of Soil Science, Assam Agricultural University, Jorhat-13, Assam, India
²Department of Soil Science, Assam Agricultural University, Jorhat-13, Assam, India
³Directorate of Research (Agri), AAU, Jorhat-13, Assam, India
⁴DWR Centre, Department of Agronomy, AAU, Jorhat-13, Assam, India
⁵ICR Farm, AAU, Jorhat-13, Assam, India
⁶Department of Soil Science, Assam Agricultural University, Jorhat-13, Assam, India
* Corresponding Author : nilayborah@rediffmail.com

Received : 10-03-2016     Accepted : 07-04-2016     Published : 14-06-2016
Volume : 8     Issue : 20       Pages : 1350 - 1353
Int J Agr Sci 8.20 (2016):1350-1353

Keywords : Cellulose degrading microbe, Yogurt, rice stubble, Glyphosate, Upland rice, Rainfed
Academic Editor : Dr Rajkishor Gogoi
Conflict of Interest : None declared
Acknowledgements/Funding : None declared
Author Contribution : None declared

The residues of crop and weeds in rainfed upland rice ecosystem need rapid, viable utilization before establishment of the succeeding crop. Enhanced decomposition reducing the volume and C:N ratio of the biomass may be a good proposition towards efficient residue management facilitating tillage and decomposition. Cellulose degrading microbe (CDM) or commercial yogurt was evaluated with glyphosate for in situ decomposition of rice stubbles after harvest. A field experiment was conducted by spraying glyphosate, and CDM or yogurt with or without sugar on rice stubbles after harvest of the crop. Glyphosate and, CDM or yogurt significantly reduced the dry weight, carbon and nitrogen content of stubbles at 25, 50 and 75 days after spray compared to untreated plot or spraying glyphosate and bacterial cultures separately, and the corresponding organic carbon content and C:N ratio of the stubble reduced significantly. The effect of adding sugar with the spray solution was not significant. The species diversity of the weeds for grass and sedge was unaffected by the treatments, but number of broadleaved weed species significantly increased due to spraying of glyphosate and, CDM or yogurt.