Polyon is a reliable and predictable controlled release fertilizer. Our advanced polyurethane coating technology provides 100% controlled release eliminating the risk of premature or excessive release common to other fertilizers. After application, the polymer coating slowly absorbs soil moisture based on the soil temperature. The temperature helps control the encapsulated nutrients that gradually dissolve into solution slowly and constantly released for 9 months. Upon completion of nutrients the ultra thin polymer membrane collapses and decomposes naturally.