The study looked at how different types of phosphate fertilizers affect the movement of harmful elements like cadmium, zinc, lead, arsenic, and micronutrients like iron and manganese in contaminated soils. They tested rock phosphate and superphosphate at different rates in two types of soils. In alkaline soil, superphosphate increased the mobility of certain elements, while rock phosphate had no effect. In acidic soil, rock phosphate decreased the mobility of cadmium and zinc. Superphosphate was better at reducing lead levels in acidic soil. Overall, phosphate fertilizers were not very effective in immobilizing harmful elements in alkaline soils, but they showed some promise in acidic soils, especially for reducing lead levels.