To compare potential of two organic materials including sewage sludge (SS) and municipal solid waste
compost (MSW) on micronutrients entry to soil, a research was conducted as split-plot arrangement based
on randomized complete block design with three replications in research field of Sari Agricultural
University. 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 that
both fertilizer treatments and application period treatments enhanced accumulation of micronutrients in
soil significantly so that SS treatments had more influence compared to MSW treatments. The highest
total and available Fe and Zn, total Mn and Cu were obtained in SS treatments. While, the most available
Mn and available Cu was observed in 3 continuous years application of enriched 40 ton MSW and 20 ton
MSW with CF, respectively.