Enriching Sugarcane Bagasse Compost by Sulfur, Nitrogen Fixing (Azotobacter Chroochoccum) and Phosphate Solubilizing Bacteria (Enterobacter Cloacae).
ladan Razikordmahalleh, Department of Environment, Hemmat Highway, Dept of soil and water pollution,department of envirnment, tehran, iran, piroozi street beween 5 and 6, apartment number 788,mr taimoori, tehran, 9821, Iran
In this research the effect of inoculation of compost with nitrogen-fixing bacteria (Azotobacter chroococcum) and the phosphate solubilizing bacteria (Enterobacter cloacea) on N and P contents of the compost was assessed. To study the production of sulfate and phosphate enriched compost with the help of basic material like sugarcane bagasse as the most readily available source of organic material in the country, elemental sulfur, rock phosphate and bacteria preparation used in 11 treatments with 4 replications in a completely randomized block experiment. Inoculation of nitrogen-fixing bacteria into compost increased contents of N and P. Enriching compost with rock phosphate and urea improved significantly the available P when inoculated with Enterobacter cloacea. Sulfur increased the sulfate concentration of the preparations and that the rate of sulfate increase was greater in the mixtures that contained phosphate solubilizing and nitrogen fixing inoculants along with sulfur as compared with those that contained sulfur alone. The pH values decreased during the experiment for every preparation, however, such decreases were significantly greater for sulfur containing mixture. The increases in the total fungi populations measured at the end of the experiment agree with the lowered pH levels of the mixtures that contained sulfur that provided a suitable environment for the growth of fungi. The EC values of sulfur containing preparations were also significantly different and higher than those of other mixtures because the increasing in the total fungi population had a positive effect on the release of nutrient elements since the fungi posses long hype capable solubilizing nutrient materials. The original of fungi did not known but in the end of experiments with use of PDA culture was determined that total population of fungi that most of them were Aspergillus sp. and Penicillium sp. increased. Sugarcane bagasse mixed with Enterobacter cloacea and Azotobacter organisms will produce a nitrogen, phosphorus and sulfate rich compost (in case rock phosphate and sulfur are also used) in the shortest time worthy of distribution to serve not only as an organic fertilizer but also as an inoculants. Key word: Enriching Compost, Nitrogen fixing (Azotobacter chroochoccum) and phosphate solubilizing bacteria (Enterobacter cloacae), Sugarcane bagasse, Sulfur and inoculant.