Organic fertilization program for strawberry
Complete organic fertilization program for strawberry based on BBCH phenological stages. Strawberry is a highly demanding crop in calcium and potassium with very short critical phases — fruit set and bulking require precise nutrition to maximize firmness, BRIX and post-harvest shelf life.
All listed products are certified CE 2018/848, NOP USDA and JAS — suitable for certified organic production
Application calendar by phenological phase
Transplant and rooting
BBCH 09-13Dose
NITROTECH 2.5: 3-4 L/ha · PHOSMAX 20: 2-3 L/ha · TERRA HUMID: 4-5 L/ha
Objective
Stimulate rapid rooting, reduce transplant stress and activate soil microbiota for optimal establishment
Active vegetative growth
BBCH 13-29Dose
NITROTECH 2.5: 4-5 L/ha · BOOST UNIVERSAL: 2-3 L/ha · FULVEX 25L: 3 L/ha
Objective
Drive leaf and stolon development, improve nutrient uptake and strengthen the root system before floral induction
Flower bud emergence
BBCH 51-59Dose
BOOST UNIVERSAL: 3 L/ha · CALCIUM 40: 2-3 L/ha · PHOSMAX 20: 2 L/ha
Objective
Maximize floral differentiation, reinforce cell walls with calcium and ensure uniform, abundant flowering
Full bloom and fruit set
BBCH 61-71Dose
CALCIUM 40: 3-4 L/ha · BOOST UNIVERSAL: 3 L/ha · K-FLOW 20: 2-3 L/ha
Objective
Increase fruit set rate, prevent fruit deformation from calcium deficiency and ensure uniform bulking onset
Fruit bulking
BBCH 71-79Products
Dose
CALCIUM 40: 3-4 L/ha · K-FLOW 20: 3-4 L/ha · NITROTECH 10: 3-4 L/ha
Objective
Meet high calcium, potassium and nitrogen demand for fruit growth, improve firmness and prevent physiological disorders
Ripening and coloring
BBCH 81-89Products
Dose
K-FLOW 20: 4-5 L/ha · FULVEX 25L: 3 L/ha
Objective
Maximize sugar content (BRIX), improve red color, firmness and post-harvest shelf life of the fruit
Post-harvest — soil preparation
Post-cosechaProducts
Dose
PHOSMAX 20: 3 L/ha · TERRA HUMID: 5 L/ha · FULVEX 25L: 3 L/ha
Objective
Regenerate soil microbiota, improve soil structure and prepare the plot for the next strawberry cycle
| Phase | BBCH | Products | Dose | Objective |
|---|---|---|---|---|
| Transplant and rooting | BBCH 09-13 | NITROTECH 2.5: 3-4 L/ha · PHOSMAX 20: 2-3 L/ha · TERRA HUMID: 4-5 L/ha | Stimulate rapid rooting, reduce transplant stress and activate soil microbiota for optimal establishment | |
| Active vegetative growth | BBCH 13-29 | NITROTECH 2.5: 4-5 L/ha · BOOST UNIVERSAL: 2-3 L/ha · FULVEX 25L: 3 L/ha | Drive leaf and stolon development, improve nutrient uptake and strengthen the root system before floral induction | |
| Flower bud emergence | BBCH 51-59 | BOOST UNIVERSAL: 3 L/ha · CALCIUM 40: 2-3 L/ha · PHOSMAX 20: 2 L/ha | Maximize floral differentiation, reinforce cell walls with calcium and ensure uniform, abundant flowering | |
| Full bloom and fruit set | BBCH 61-71 | CALCIUM 40: 3-4 L/ha · BOOST UNIVERSAL: 3 L/ha · K-FLOW 20: 2-3 L/ha | Increase fruit set rate, prevent fruit deformation from calcium deficiency and ensure uniform bulking onset | |
| Fruit bulking | BBCH 71-79 | CALCIUM 40: 3-4 L/ha · K-FLOW 20: 3-4 L/ha · NITROTECH 10: 3-4 L/ha | Meet high calcium, potassium and nitrogen demand for fruit growth, improve firmness and prevent physiological disorders | |
| Ripening and coloring | BBCH 81-89 | K-FLOW 20: 4-5 L/ha · FULVEX 25L: 3 L/ha | Maximize sugar content (BRIX), improve red color, firmness and post-harvest shelf life of the fruit | |
| Post-harvest — soil preparation | Post-cosecha | PHOSMAX 20: 3 L/ha · TERRA HUMID: 5 L/ha · FULVEX 25L: 3 L/ha | Regenerate soil microbiota, improve soil structure and prepare the plot for the next strawberry cycle |
Complete program
Download the strawberry fertilization program
PDF with complete BBCH table, doses and product sheets
FAQs about organic strawberry fertilization
Why is calcium so important in organic strawberry cultivation?
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Calcium is the most critical nutrient in strawberry because it directly determines fruit firmness, post-harvest resistance and blossom end rot prevention. Strawberry has a very short fruit set window and rapid bulking — if calcium supply fails during that phase, fruits become soft and have reduced shelf life. Unlike other nutrients, calcium moves slowly in the plant and only through the transpirational stream, so frequent foliar applications with CALCIUM 40 are essential to maintain adequate levels in actively growing tissues.
How many biostimulant applications are needed in an organic strawberry cycle?
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A complete organic strawberry program involves 8 to 12 applications throughout the cycle, depending on cycle length (short 4-5 month cycle or continuous production). The most critical phases — flowering, fruit set and bulking — receive applications every 10-14 days. BOOST UNIVERSAL is applied at all critical stages for its effect on nutrient absorption efficiency and stress resistance. With drip fertigation, doses can be split and applied more frequently without overdose risk.
How to improve BRIX and firmness in organic strawberry production?
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BRIX and firmness in organic strawberry mainly depend on two nutrients: potassium (controlling sugar accumulation and cell turgor) and calcium (determining cell wall rigidity). An effective program should progressively increase the proportion of K-FLOW 20 from the start of bulking, combined with continuous CALCIUM 40 in fertigation. Unicellular algae biostimulants like BOOST UNIVERSAL improve the plant's metabolic efficiency, contributing to better sugar synthesis and anthocyanin production responsible for deep red color.