What types of foliar fertilizers are there for watermelon?

(Agricultural Wealth Network) In the middle and late stages of watermelon growth, because root growth slows down and root function gradually declines, the ability to absorb nutrients also tends to weaken. Usually, the method of applying foliar fertilizer is adopted. The main types of foliar topdressing are the three key elements nitrogen, phosphorus, and potassium. Generally, a 0.3% to 0.5% urea solution, a 0.4% to 0.5% potassium sulfate solution, a 0.4% to 0.5% superphosphate extract, or a 0.3% monopotassium phosphate solution can be sprayed on the leaves.