Survey on qualitative characteristics of compost and Bio-compost fertilizers

摘要

In all of aspects of wastes management, observance of rules and standards is vital and necessary in protection of environment and biosphere. In creation, developing and processing management of compost and biocompost industries, observance of scientific standards and controlling the qualitative characteristics of products are inevitable. So economic and health consideration initiated a study aiming to investigation on qualitative characteristics of compost and biocompost in Shiraz city of Iran. For identifying quality of those fertilizers samples collected in winter and summer of 2008 and physical and chemical characteristics have been investigated. The results showed that concentration of nutrients such as nitrogen, phosphorus, calcium and potassium are in normal level. In contrast concentration of heavy metals such as nickel, plumb and cadmium are not in proper levels and humidity percent of fertilizers are below the normal limit due to evaporation and high temperature of summer season. Totally, the quality of biocompost is higher than compost because of higher percentage of organic materials and keeping compost and biocompost in desired quality requires more protection especially in high temperature seasons.