Nitrogen (N) plays a central role in the growth and productivity of southern highbush blueberries. It supports canopy development, fruit production, and the formation of floral buds for the following season. Determining the right N fertilization rate is not straightforward. Fertilizer needs vary widely depending on soil or media type, cultivar, irrigation methods, and more. At UF/IFAS, ongoing research is focused on developing Florida-specific Best Management Practices (BMPs) for N fertilization to help growers apply N more efficiently and sustainably.

The Challenge With Blueberry Fertilization in Florida’s Growing Systems

Florida currently lacks its own specific fertilization guidelines. Fertilization practices in use today are largely adapted from other production regions or based on grower experience.  Grower knowledge is irreplaceable. But volatile fertilizer prices and environmental concerns are inviting us to develop science-based recommendations that prevent over- or under-fertilization.

In Florida, we use pine bark as a soil amendment to create an acidic, well-drained soil environment suitable for blueberries. However, pine bark also poses unique challenges for N management. When fresh and undecomposed pine bark is added to the soil it can tie up N as microbes break down the bark, reducing the amount N available to plants. The high porosity of undecomposed pine bark can also reduce the water holding capacity of the soil, complicating irrigation management and increasing the potential for nutrient leaching.