The study looked at how soil compaction affects different types of soil. They found that compaction doesn't change the pH or electrical conductivity much, but it does affect the amount of organic carbon in the soil. Sandy clay loam soil had the most organic carbon, while loamy sand had the least. As compaction increased, the levels of available nutrients like nitrogen, phosphorus, potassium, zinc, and iron decreased in the soil. This shows that soil compaction can impact the health and fertility of the soil by reducing the availability of essential nutrients for plant growth.