The study looked at how city soil quality changes over time and how applying organic fertilizer can help improve it. They compared different types of soil and found that city soil had the highest density and lowest porosity. Organic matter in city soil was much lower than in agricultural soil. City soil had more phosphorus, indicating nutrient buildup. Fertilizing city soil can make it lighter, improve air flow, increase water content, and balance pH levels. This helps to boost nutrients like nitrogen and phosphorus in the soil.