Blueberry Nutrition Simplified: How a High-Ammonium Fertigation Strategy Can Improve Vegetative Growth and Reduce Acid Use

Blueberries are highly sensitive to soil pH and nutrient balance. For growers, maintaining optimal root-zone conditions is essential to achieving vigorous vegetative growth, healthy root development, and high-quality fruit production. However, managing soil acidity often requires continuous acid applications, adding cost and complexity to fertigation programs.

An innovative approach based on a higher ammonium-to-nitrate ratio offers an opportunity to simplify nutrient management while naturally supporting the acidic conditions blueberries prefer.

Why Soil Acidity Is Critical for Blueberries?

Blueberries perform best in acidic soils, typically within a pH range of 4.5 to 5.5. When the pH rises above this range, nutrient availability decreases, particularly for micronutrients such as iron and manganese. This can result in chlorosis, weaker plant growth, and lower productivity.

For this reason, several growers rely on acid injections throughout the growing season to maintain suitable root-zone conditions. While effective, this practice requires more input, monitoring, and operational management.

Iron deficiency when soil pH is high.        

🌱 Ammonium Nutrition: A Natural Way to Support Acidification

Nitrogen can be supplied to plants in two main forms: ammonium (NH₄⁺) and nitrate (NO₃⁻). The balance between these forms has a significant impact on the root-zone environment.

When blueberry plants absorb ammonium, they release hydrogen ions (H⁺) into the rhizosphere. This natural process lowers pH around the roots, creating a more favorable environment for nutrient uptake and plant development.

By increasing the proportion of ammonium during the vegetative stage, growers can encourage natural root-zone acidification and potentially reduce the need for more acid applications.

📋 Recommended Fertigation Program for Blueberries

To meet the nutritional requirements of blueberries throughout the season, the fertilization program should be adapted to each growth stage.

🌿 Vegetative Stage

During vegetative growth, a specialized formula with a high ammonium-to-nitrate ratio can support plant development while contributing to natural root-zone acidification:

🔹 NUTRION NPK 15-7-16 + 2Mg + 2ME
NH₄⁺ : NO₃⁻ ratio = 70 : 30

This formulation promotes vigorous vegetative growth and helps support favorable pH conditions around the roots, reducing the need for additional acidification during this stage.

🌸 Flowering & Harvest Stage

As plants transition to flowering and fruit production, nutrient demands change and require a different nutritional balance:

🔹 NUTRION NPK 17-10-27 + ME

This formula can be complemented with Fertimed straight fertilizers according to crop nutrient requirements and irrigation water analysis.

To maintain optimal conditions for nutrient uptake, sulfuric acid may be added to lower soil pH to 4.5–5.0, ensuring continued nutrient availability during flowering, fruit set, and harvest.

🚀 How FERTIMED Supports Advanced Blueberry Nutrition

At FERTIMED, we help growers overcome the challenges of alkaline soil, nutrient availability, and efficient fertigation. Our specialty fertilizer solutions are designed to support balanced crop nutrition, improve nutrient uptake, and optimize plant performance throughout the growing cycle.

Whether you’re managing blueberries or other high-value crops, FERTIMED provides tailored nutritional solutions and expert agronomic support to help maximize productivity and crop quality.

Contact FERTIMED to develop a fertilization program adapted to your crop, soil, and water conditions.

📞 Partner with FERTIMED

Looking to optimize your blueberry nutrition program? FERTIMED provides innovative specialty fertilizer solutions and agronomic support to help growers achieve healthier plants, higher yields, and improved fruit quality throughout the season.