What about Wolff controlled release fertilizer?

Wolfe slow-release fertilizer is a new type of fertilizer, which is energy-saving and environment-friendly, improves the utilization rate of fertilizer, and its manufacturing process is complicated, so its price is high. You don't have to doubt that this fertilizer is a mixture of nitrogen, phosphorus, potassium and various trace elements. It is coated with sulfur and resin to form a double-layer controlled-release film. The controlled-release film has nano-pores that can't be seen by our eyes. When the fertilizer is applied to the field, the moisture in the soil seeps into the particles through the controlled-release film, and the solids of nutrients in the film are slowly turned into liquid. The liquid is released into the soil through the film, and the nutrients released into the soil are absorbed by the roots of crops, slowly released and slowly absorbed, and the fertilizer is not lost. Note that different crops have different formulations and different controlled release times.