EVALUATION OF TOWN REFUSE COMPOSTS PRODUCED BY DIFFERENT TECHNOLOGICAL METHODS BY MEASURING THEIR EFFECTS ON CHEMICAL AND BIOLOGICAL ACTIVITIES OF SANDY SOILS | ||
| Journal of Agricultural Chemistry and Biotechnology | ||
| Article 2, Volume 28, Issue 1, January 2003, Pages 565-572 PDF (2.37 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jacb.2003.243987 | ||
| Authors | ||
| S. M. Abd EI Malek,; M. A. Azzazy | ||
| Agricultural Microbiology, National Research Center, Dokki, Cairo, Egypt | ||
| Abstract | ||
| A laboratory experiment was carried out to evaluate the manurial value of different composts, produced by different technological methods, by measuring their effects on some chemical and biological changes ir, newly reclaimed sandy soil. These changes included: pH, organic carbon, total nitrogen and available-p, as well as, the C02 evolution and enzymatic activities of invertase, phosphatase and dehydrogenase. The soil samples were taken periodically (initially and after 2, 4, 8 and 12 weeks of added composts. The obtained results showed that amending the soil with the different types of composts prepared by different additives slightly decrease the soil pH. The organic carbon and total nitrogen increased in treated soil due to the higher C and N content of the added composts. The CIN ratio narrowed in all treatments as a result of organic carbon mineralization and the slightly increasing of total nitrogen in soil. Addition of compost also increased the available phosphorus as a result of organo-phosphorus compounds mineralization. Generally, the composts added in soil, increased the C02 evolved as a result of stimulation of micro organisms in soil and induced the enzymes studied, improving their activities in soil, especially, in the organic accelerated composts followed by the chemical accelerated one. | ||
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