INFLUENCE OF SEWAGE SLUDGE APPLICATION ON SOME SOIL BIOLOGICAL CHARACTERS | ||
| Journal of Plant Production | ||
| Article 8, Volume 29, Issue 6, June 2004, Pages 3231-3241 PDF (1.11 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpp.2004.238648 | ||
| Author | ||
| M. Z. Sedik, | ||
| Microbiology Department, Faculty of Agriculture, Cairo University | ||
| Abstract | ||
| Soil samples were treated with different rates of sewage sludge (10, 20, 40, 80 and 120 tons/fed). The lola I bacterial count and the count of microorganisms adapted to different rates of sewage sludge were recorded after 1,2.4.8,12 and 14 weeks. Also, tolerance of some bacterial isolates to five heavy metals detected in sewage sludge was studied. In addition, urease, phosphatase activities and C02 evolution were assayed during the incubation period. Results showed that when soil was treated with sewage sludge. the total count was increased (rom 3.6 X106 to 3.12X 107 CFU s'' dry soil throughout the 14 days. Compared to the control treatment, sewage sludge at the rate of 10 tons/fed proved to be toxic to the soil microbial population. Moreover, addition of high rates of sewage (20, 4080 and 120 tons/fed). the counts were less and ranged between 5.0 X 102 and 3.0 X104 CFU s" dry soil. As a result of adding different rates of sewage sludge, twenty seven bacterial isolates were picked from the agar plates as resistant bacteria, These isolates were purified and classified into four groups (G· cocci, O' spore former, G' short rods and G' short rods). The data recorded about the enzymes activities (urease and phosphatase) detected that urease and phosphatase activities were increased throughout the 14 days followed by a decrease in its activities until the end of the incubation period. The same observation was recorded with C02 evolution, where its value was decreased with the incubation period increased. | ||
| Keywords | ||
| Sewage sludge; Bacterial; Cocci; Spore former; Short rods; Urease; Phosphatase; C02 evolution | ||
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