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 50S: 3 kg/ha
Objective
Drive leaf and runner 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
Maximise floral differentiation, reinforce the cell wall 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 the fruit set rate, avoid fruit deformation from calcium shortage and ensure uniform early bulking
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
Cover the high calcium, potassium and nitrogen demand for fruit growth, improve firmness and avoid physiological disorders
Ripening and coloring
BBCH 81-89Products
Dose
K-FLOW 20: 4-5 L/ha · FULVEX 50S: 3 kg/ha
Objective
Maximise sugar content (BRIX) and improve red colour, firmness and post-harvest life
Post-harvest — soil preparation
Post-cosechaProducts
Dose
PHOSMAX 20: 3 L/ha · TERRA HUMID: 5 L/ha · FULVEX 50S: 3 kg/ha
Objective
Regenerate soil microbiota, improve 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 50S: 3 kg/ha | Drive leaf and runner 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 | Maximise floral differentiation, reinforce the cell wall 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 the fruit set rate, avoid fruit deformation from calcium shortage and ensure uniform early bulking | |
| Fruit bulking | BBCH 71-79 | CALCIUM 40: 3-4 L/ha · K-FLOW 20: 3-4 L/ha · NITROTECH 10: 3-4 L/ha | Cover the high calcium, potassium and nitrogen demand for fruit growth, improve firmness and avoid physiological disorders | |
| Ripening and coloring | BBCH 81-89 | K-FLOW 20: 4-5 L/ha · FULVEX 50S: 3 kg/ha | Maximise sugar content (BRIX) and improve red colour, firmness and post-harvest life | |
| Post-harvest — soil preparation | Post-cosecha | PHOSMAX 20: 3 L/ha · TERRA HUMID: 5 L/ha · FULVEX 50S: 3 kg/ha | Regenerate soil microbiota, improve 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 Strawberry fertilization
Why is calcium so important in organic strawberry?
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Calcium is the most critical nutrient in strawberry because it directly determines fruit firmness, post-harvest keeping and cell-wall quality. Strawberry has a very short set window and rapid bulking — if calcium supply fails at that stage, fruit ends up soft with reduced shelf life. Unlike other nutrients, calcium moves slowly in the plant and only with the transpiration stream, so frequent foliar applications of CALCIUM 40 are essential to keep adequate levels in actively growing tissue.
How many biostimulant applications does an organic strawberry cycle need?
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A full organic strawberry programme runs 8 to 12 applications over the cycle, depending on its length (a short 4-5 month cycle or continuous production). The most critical stages — flowering, set and bulking — are treated every 10-14 days. BOOST UNIVERSAL is applied at every critical stage for its effect on nutrient uptake efficiency and stress tolerance. Under drip fertigation, rates can be split and applied more often without risk of overdosing.
How to improve BRIX and firmness in organic strawberry?
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BRIX and firmness in organic strawberry depend mainly on two nutrients: potassium, which governs sugar accumulation and cell turgor, and calcium, which determines cell-wall rigidity. An effective programme progressively raises the share of K-FLOW 20 from the start of bulking, combined with CALCIUM 40 in continuous fertigation. Unicellular algae biostimulants such as BOOST UNIVERSAL improve the plant's metabolic efficiency, contributing to better sugar synthesis and to the anthocyanins behind the deep red colour.