soil temperature – affects the nutrients release of controlled release fertilizers. As for slow release fertilizers, there are multiple factors affecting the release (soil moisture, temperate, pH, etc.). Thus, using controlled release fertilizers the nutrient release is much more predictable.
slow release fertilizers (SRF) supply nutrients gradually. Yet, slow release fertilizers and controlled release fertilizers differ in many ways: The technology they use, the release mechanism, longevity, release controlling factors and more.