comparison between the potential of sewage sludge and municipal solid waste compost on enrichment of soil with some micronutrients

to compare potential of two organic materials including sewage sludge (ss) and municipal solid wastecompost (msw) on micronutrients entry to soil, a research was conducted as split-plot arrangement basedon randomized complete block design with three replications in research field of sari agriculturaluniversity. main-plot (fertilizer treatments) included 20 and 40 ton/ha ss, 20 and 40 ton/ha ss + 50%chemical fertilizer (cf), 20 and 40 ton/ha msw, 20 and 40 ton/ha msw + 1/2 cf, cf and control. subplot(years of application) comprised 3 treatments (1, 2 and 3 times of application). results showed thatboth fertilizer treatments and application period treatments enhanced accumulation of micronutrients insoil significantly so that ss treatments had more influence compared to msw treatments. the highesttotal and available fe and zn, total mn and cu were obtained in ss treatments. while, the most availablemn and available cu was observed in 3 continuous years application of enriched 40 ton msw and 20 tonmsw with cf, respectively.