Abstract:

This study was carried out in order to determine the effects of sewage sludge on some micronutrients contents of soil. The research was conducted essentially by using “wheat + white head cabbage + tomato” crop rotation system and planned according to randomized blocks trial design. 0, 10, 20, 30, 40 and 50 t ha-1 doses of sewage sludge and optimum recommended doses of chemical fertilizer composed of nitrogen (N) and phosphorus (P) were applied. According to the results, extractable iron, copper and zinc contents of soils was increased with the increasing rates of sewage sludge. However, there was no variation manganese content of the soil.