The study looked at different forms of potassium in acidic brown hill soils in Simla. They found that the amount of potassium varied in the soil samples, with some samples having more than others. The researchers also discovered that certain types of potassium were linked to factors like organic carbon and soil texture. They found that the soils had a low capacity to hold onto potassium, which means that adding potassium fertilizer is important for plant growth in these soils.