Controlled-Release Technology
Controlled-Release Technology

CONTROLLED-RELEASE TECHNOLOGY

Enhanced Efficiency Fertilizer Technologies

Polymer-coated fertilizers (PCFs) release nutrients based on osmosis and diffusion through the coating. Water passes through the polymer outer layer and dissolves the nutrients inside. Nutrients move through the coating in response to a concentration gradient (high concentration inside the coating, low concentration outside the coating). Release rate and longevity are controlled by coating thickness and soil temperature.

Because the release follows a known temperature response, PCFs provide a predictable, controlled release of nutrients over a desired timeframe (typically 2 to 12 months). Release is minimal when soil is cool and increases with rising soil temperatures to coincide with plant growth and nutrient demand.

Golf course superintendents have utilized controlled-release fertilizers for decades to help manage the wide range of needs their courses require. Fewer applications, less labor and flexible programs are among some of the advantages. Professional sports field managers, landscapers, LCOs and specialty ag growers are bringing EEFs more into play for the same reasons.

Koch controlled-release products include:

Polyon Duration CR