50% Slow Release Nitrogen

Essential Micronutrients

Low Chlorine (low salt)

The University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) recommends using a balanced, slow-release citrus-specific fertilizer that also contains micronutrients. Common recommended NPK ratios include 6-6-6, 8-8-8, or 10-10-10.

Fertilizer Recommendations

• Nutrient Ratio: The ideal fertilizer ratio includes equal parts nitrogen (N) and potassium (K), with a smaller portion of phosphorus (P), such as a 6-4-6 or 8-3-9 analysis. Soil tests can help determine exact P and K needs.
• Micronutrients: Ensure the chosen fertilizer includes essential micronutrients like magnesium, sulfur, iron, manganese, and zinc, which are vital for plant health and fruit production, especially in Florida's sandy, well-drained soils.
• Slow-Release Formula: UF/IFAS highly recommends using slow-release or controlled-release granular fertilizers, which provide nutrients to the plants over a period of 6 to 12 months and reduce the risk of nutrient leaching in the rainy season.
• Application Timing: For slow-release fertilizers, apply twice a year in February/March (before bloom) and around September/October (after the rainy season). For dry soluble fertilizers, more frequent applications (e.g., February, May, August, October) are needed.
• Application Method: Spread the fertilizer evenly around the base of the tree, starting about 1 to 1.5 feet from the trunk and extending to the drip line (the edge of the canopy). Avoid placing the fertilizer directly against the tree trunk.
• Soil pH: Citrus trees prefer a soil pH between 5.5 and 6.5. A soil test can help determine if liming is needed to adjust the pH, which affects nutrient availability.

In 2026, the 8-4-8 Citrus Blend remains a frequently recommended fertilizer ratio for Florida citrus trees, often aligning with current UF/IFAS (University of Florida Institute of Food and Agricultural Sciences) guidelines for home and commercial citrus production. This specific N-P-K (Nitrogen-Phosphorus-Potassium) ratio is designed to provide balanced nutrition while supplementing critical micronutrients like magnesium, iron, and manganese to prevent leaf yellowing (chlorosis).

Fertilization Guidelines for 2026

According to 2025–2026 UF/IFAS production guides, nutrient management should be tailored to the age and health of the tree:

• Application Timing: Apply 3 to 4 times per year. Optimal windows are early spring (February), early summer (May), and late summer (August).
• Tree Maturity Rates:
  • New Trees (Year 1): Use about 2 cups broadcasted under the canopy. UF/IFAS suggests up to 6 light applications during the first year to establish roots.
  • Established Trees (Mature): Use approximately 8 cups broadcasted evenly under the canopy.
• Technique: Broadcast the granules evenly under the tree drip line. Avoid letting the fertilizer touch the trunk, and water thoroughly before and after application to ensure nutrients reach the root zone.

Key Considerations

• HLB (Citrus Greening) Management: For trees affected by HLB, 2026 UF/IFAS guides recommend lower nitrogen rates (120–150 lbs/acre for oranges) due to reduced root efficiency, but emphasize the importance of consistent micronutrient supply found in blends like 8-4-8.
• Controlled Release: Modern 8-4-8 blends often utilize slow-release nitrogen (around 30%) to provide extended feeding for up to 2–3 months while reducing environmental runoff.
• Soil Testing: It is highly recommended to obtain a soil test through your local extension office to identify specific deficiencies before applying high-potassium blends like 8-4-8.