Document Type : Research Article
Authors
1 Department of Soil Science, Sari Agricultural Science and Resources Natural University
2 Department of Soil Science, Faculty of Agriculture, Ferdowsi University of Mashhad
Abstract
Sewage sludge with having the organic matter is considered as a source of micro and macro elements. In order to investigate the effect of different levels and period of application of sewage sludge (SS) on organic matter, respiration, and acid and alkaline phosphatase activity, factorial design were studied, in 3 replications. Sewage sludge at five levels, (20 and 40 tons of sewage sludge, 20 and 40 tons of sewage sludge + 50 percent of chemical fertilizers (CF) per hectare, without taking sewage sludge) and period of application three levels (two, three and four years) was considered. The results showed that application of SS at all levels, increased soil organic carbon (O.C) and soil microbial respiration and enzyme activity were compared with the controls (p
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