Organic fertilization program for tomato
Complete organic fertilization program for tomato based on BBCH phenological stages. Tomato is one of the most demanding crops in calcium and potassium — each phase requires a precise combination of nutrients to maximize fruit set, quality and prevent physiological disorders.
All listed products are certified CE 2018/848, NOP USDA and JAS — suitable for certified organic production
Application calendar by phenological phase
Transplant and establishment
BBCH 09-13Dose
NITROTECH 2.5: 3-4 L/ha · PHOSMAX 20: 2-3 L/ha · TERRA HUMID: 4-5 L/ha
Objective
Promote root establishment, reduce transplant stress and activate soil microbiota
Active vegetative growth
BBCH 13-19Dose
NITROTECH 2.5: 4-5 L/ha · BOOST UNIVERSAL: 2-3 L/ha · FULVEX 25L: 3 L/ha
Objective
Stimulate vegetative growth, improve nutrient availability and strengthen the root system
Flower bud emergence
BBCH 51-57Dose
BOOST UNIVERSAL: 3 L/ha · UNIVERSAL POWER: 2 L/ha · CALCIUM 40: 2-3 L/ha
Objective
Maximize viable flower number, reinforce cell walls and prevent blossom end rot
Full bloom and fruit set
BBCH 61-71Dose
BOOST UNIVERSAL: 3 L/ha · CALCIUM 40: 3-4 L/ha · K-FLOW 20: 3 L/ha
Objective
Increase fruit set rate, prevent fruit drop and ensure calcium supply during the critical phase
Fruit bulking
BBCH 71-79Products
Dose
NITROTECH 16: 5-7 kg/ha · CALCIUM 40: 3-4 L/ha · K-FLOW 20: 4-5 L/ha
Objective
Cover high nitrogen, calcium and potassium demand for fruit growth and prevent physiological disorders
Ripening and color change
BBCH 81-89Products
Dose
K-FLOW 20: 5-6 L/ha · FULVEX 25L: 3-4 L/ha
Objective
Maximize lycopene and sugar content, improve color and fruit firmness for commercialization
Post-harvest and 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 CEC and prepare the plot for the next crop cycle
| Phase | BBCH | Products | Dose | Objective |
|---|---|---|---|---|
| Transplant and establishment | BBCH 09-13 | NITROTECH 2.5: 3-4 L/ha · PHOSMAX 20: 2-3 L/ha · TERRA HUMID: 4-5 L/ha | Promote root establishment, reduce transplant stress and activate soil microbiota | |
| Active vegetative growth | BBCH 13-19 | NITROTECH 2.5: 4-5 L/ha · BOOST UNIVERSAL: 2-3 L/ha · FULVEX 25L: 3 L/ha | Stimulate vegetative growth, improve nutrient availability and strengthen the root system | |
| Flower bud emergence | BBCH 51-57 | BOOST UNIVERSAL: 3 L/ha · UNIVERSAL POWER: 2 L/ha · CALCIUM 40: 2-3 L/ha | Maximize viable flower number, reinforce cell walls and prevent blossom end rot | |
| Full bloom and fruit set | BBCH 61-71 | BOOST UNIVERSAL: 3 L/ha · CALCIUM 40: 3-4 L/ha · K-FLOW 20: 3 L/ha | Increase fruit set rate, prevent fruit drop and ensure calcium supply during the critical phase | |
| Fruit bulking | BBCH 71-79 | NITROTECH 16: 5-7 kg/ha · CALCIUM 40: 3-4 L/ha · K-FLOW 20: 4-5 L/ha | Cover high nitrogen, calcium and potassium demand for fruit growth and prevent physiological disorders | |
| Ripening and color change | BBCH 81-89 | K-FLOW 20: 5-6 L/ha · FULVEX 25L: 3-4 L/ha | Maximize lycopene and sugar content, improve color and fruit firmness for commercialization | |
| Post-harvest and soil preparation | Post-cosecha | PHOSMAX 20: 3 L/ha · TERRA HUMID: 5 L/ha · FULVEX 25L: 3 L/ha | Regenerate soil microbiota, improve CEC and prepare the plot for the next crop cycle |
Complete program
Download the tomato fertilization program
PDF with complete BBCH table, doses and product sheets
FAQs about organic tomato fertilization
Why is calcium so important in organic tomato cultivation?
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Calcium is the most critical nutrient in organic tomato because it prevents Blossom End Rot, a physiological disorder caused by local calcium deficiency at the fruit tip. Calcium demand peaks during flowering, fruit set and bulking phases. Unlike other nutrients, calcium moves slowly in the plant and only through the transpirational stream, so frequent foliar applications and fertigation with CALCIUM 40 are essential to maintain adequate levels in actively growing tissues.
How often should biostimulants be applied in organic tomato?
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In a standard program, biostimulant applications in organic tomato are made every 10-15 days during the critical phases of flowering, fruit set and bulking. During lower-demand phases (established vegetative) applications can be spaced to every 20-21 days. The annual total in a long greenhouse tomato cycle can reach 12-15 applications. For outdoor crops with shorter cycles, 6-8 applications are typical. Fertigation allows doses to be split and applied more frequently without overdose risk.
When should potassium be increased in tomato fertilization?
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Potassium should be progressively increased from the start of fruit bulking (BBCH 71) through full ripening (BBCH 89). From fruit set onwards, the K:N ratio in the fertigation program should increase — while it is typically 1:1 during vegetative growth, it should reach 2:1 or even 3:1 during bulking and ripening. A good potassium supply at this stage improves sugar content (Brix), red color through lycopene synthesis, firmness and post-harvest shelf life. K-FLOW 20 is particularly effective at this stage due to its rapid foliar and root uptake.