The study looked at how different levels of phosphorus in soil affect soybean growth and yield. They found that using a specific amount of phosphorus, nitrogen, and potassium led to the highest soybean yield. This combination also resulted in the plant absorbing more nutrients like nitrogen, phosphorus, and potassium from the soil. In conclusion, adding more phosphorus along with the right amounts of nitrogen and potassium can help increase both the nutrient uptake and yield of soybeans grown in Vertisols.