EVALUATION OF APPLIGATION OF BACTERIAL INOCULA FOR RICE STRAW DURING COMPOST PROCESS UNDER AEROBIC CONDITIONS | ||
| Journal of Soil Sciences and Agricultural Engineering | ||
| Article 6, Volume 28, Issue 7, July 2003, Pages 5787-5801 PDF (1.89 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jssae.2003.252685 | ||
| Authors | ||
| Laila K.M. Ali,; Wafaa T. EL-Etr; Elham I. EL-Khatib | ||
| Soils, Water and Environment Res. Inst., Agric. Res. Center, Giza, Egypt | ||
| Abstract | ||
| Aerobic composting process of rice straw. chicken manure. natural material i.e, felespar • magnetite . rock phosphate and enriched wilh some bacterial inocula was investigated to find out the best conditions for relatively rapid maturity : evaluation of chemical and biological changes occurring during decomposition process was also carried out. Composting process was continued for 150 days under aerobic conditions and 90 days after enriched with various bacteria ; during composting. samples were subjected to chemical and microbiological analyses. Chemical determinations included EC, pH along with total N, P. K, available micronutrients (Fe. Mn, Zn and Cu); temperature as well as C/N ratio were also evaluated . Microbiological determinations.on the other hand ,were performed through counting of total bacteria i.e.. Azotobacter chroococcum. Bacillus megatherium and Bacillus circulance. Finally. growth regulators represented by indol acetic acid (1AA) gibberellic acid (GA3) and abscisic acid (ABA) were extrected from the studied compost to be then assayed. Monitoring of the composting process showed that, temperature rises during the first two weeks of composting (thermophilic stag). It reached 58-62 0 C starting from the third week and up the mesophilic stage appeared to be dominant towards the end of the compo sting process. EC and pH values were increased with increasing composting lime of rice straw heaps especially after application of bacterial inoculas: total N. P, K. Fe. Mn, Zn and Cu values were also increased opposite to C/N ratio which was decreased. Generally. the count of the studied three bacterial strains were higher at all the invesligted time periods as compared to the zero time ( before application of bacterial inocula). Furthermore. the nitrogen. phosphorus and potassium content increased after 90 days from application of either Azotobacter chroococcurn, B. megatherium or B. circulance. | ||
| Keywords | ||
| compost. rice straw; bacterial inocula. Azotobacter chroococcum. B. megatherium; 8. circulance; indol acetic acid .• gibberellic acid. abscisic acid | ||
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