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Pros and cons of using controlled-release fertilizers in the greenhouse

Controlled-release fertilizers (CRFs) are granular fertilizer particles that are coated with a polymer or resin that restricts the amount of moisture contact and functions to dissolve the fertilizer particles to gradually release fertilizer over time. The thickness of the coating and air temperature dictate the release rate. The higher the temperature, the faster the fertilizer will be released. Most CRFs are sold with an expected release rate based on 75 °F. CRF prills are primarily incorporated into the growing medium, but can also be applied as a top dress on the growing medium's surface.

The focus for this article is to discuss the pros and cons of using a controlled-release fertilizer compared to traditional water soluble fertilizers. A future article will address the benefits of using these two fertilizer forms in combination.

Click here to read the benifits and disadvantages of controlled-release fertilizers at pthorticulture.com