Potassium is important for growing maize, but using the right amount of potassium fertilizer can be tricky. A study in Northeast China looked at how different levels of potassium affected maize yield and plant health. They found that using the recommended amount of potassium led to the highest yield, while too much potassium actually decreased yield. By using a special model, they figured out the best amount of potassium to use for different soil types. This can help farmers save money on fertilizer while still getting good maize crops.