Effects of Repeated Applications of Sewage Sludge and MSW Compost on Soil Chemical Characteristics and yield of Zea mays L. in Rudasht - Esfahan

To study the effect of different amounts of municipal compost and sewage sludge on soil properties and yield of maize after one and five years of consumption, a scientific experiment was conducted in Rudasht irrigation and drainage research station of Isfahan, Iran. The applied treatments of 25 and 50 t/ha of municipal compost and 15 and 30 t/ha of sewage sludge and control treatment (non-application of organic fertilizer) before planting, were used in constant plots in a randomized complete block design with three replications. As a result of organic fertilizer consumption, the pH decreases and concentrations of some essential elements concordant with the lead element increased significantly in the soil. The amounts of micro and macro elements were also increased in harvested corns. It was clear that the concentrations of those elements have increased in soil and corn after five years compared with one year of organic fertilizer consumption. The yield of corn was increased significantly by five year of fertilizer usage in comparison with control treatment