Science Target Conference Systems, Ajman 4th International Environment Conference 2016

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Pressmud, a lignocellulosic waste as potential carrier for in-situ production of plant growth promoting substances by Bacillus circulans
Aparna B Gunjal, Balasaheb P Kapadnis

Last modified: 2016-11-24


There are different lignocellulosic wastes generated in agroindustries, viz., peanut shells in peanut industries; corn cob in maize industries; paddy husk in rice milling industries; pressmud in sugar industries and sawdust in sawmills. These lignocellulosic wastes are either disposed in landfills or burnt.  Such carriers are renewable and facilitate in-vitro production of plant growth promoting substances. The solid state fermentation was carried out in pressmud based carrier using Bacillus circulans. The leachate from the solid state fermentation was analyzed for plant growth promoting traits viz., indole acetic acid, gibberellins and cytokinins; hydrogen cyanide; siderophores; acetyl methyl carbinol and diacetyl compounds; solubilization of minerals; ammonia production; and enzymes. The leachate was also analyzed for antifungal activity. The effect of fermented broth of Bacillus circulans grown on pressmud was studied on plant growth. The gibberellins production was high on 14th day in the pressmud fermented broth inoculated with Bacillus circulans which was 11.60 µg ml-1. The phosphate solubilization and phytase production was more on 14th day with relative activity 2.60 and 4.14 respectively. The NH3 production was more on 3rd day by the fermented broth of pressmud inoculated with Bacillus circulans which was 67.20 ppm. It also showed increase in the germination and vigor index of maize, jowar and bajra plants. Significant increase was found in the root length of jowar and bajra plants. The study showed that production of plant growth substances in the solid state fermentation is possible.