The study looked at how different types of fertilizer affect the yield and profits of potato crops. They compared two types of fertilizer, one with more phosphorus and less nitrogen and potassium, and one with less phosphorus but more nitrogen and potassium. They found that the fertilizer with more phosphorus led to higher potato yields and profits compared to the traditional fertilizer. This means that using the right type of fertilizer can help farmers grow more potatoes and make more money.