The researchers studied how different types of soil in North-West India release phosphorus. They looked at soils from dry areas and found that the amount of phosphorus released was related to the ratio of clay to organic carbon in the soil. They used equations to describe how phosphorus is released from the soil over time. The results show that the amount of calcium carbonate in the soil affects how phosphorus is released. Overall, the type of soil and its properties can impact how phosphorus moves in the soil.