Increasing the amount of phosphate and trace element fertilizers in wheat cultivation can significantly boost yield and profits. Adding these fertilizers at specific levels can lead to a substantial increase in wheat production and earnings. However, doubling the amount of potash fertilizer may not have the same positive effect. In fact, increasing phosphate and potash fertilizers simultaneously can lead to a decrease in benefits. Overall, phosphate fertilizer plays a crucial role in enhancing wheat production and profitability.