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 rooting, 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 50S: 3 kg/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
Maximise the number of viable flowers and cover calcium demand at fruit set, the stage that determines cell-wall firmness
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 the fruit set rate, limit fruit drop and secure calcium supply at the critical stage
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 the high nitrogen, calcium and potassium demand for fruit growth and avoid physiological disorders
Ripening and color change
BBCH 81-89Products
Dose
K-FLOW 20: 5-6 L/ha · FULVEX 50S: 3-4 kg/ha
Objective
Maximise lycopene and sugar content and improve fruit colour and firmness for market
Post-harvest and 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 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 rooting, 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 50S: 3 kg/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 | Maximise the number of viable flowers and cover calcium demand at fruit set, the stage that determines cell-wall firmness | |
| 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 the fruit set rate, limit fruit drop and secure calcium supply at the critical stage | |
| 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 the high nitrogen, calcium and potassium demand for fruit growth and avoid physiological disorders | |
| Ripening and color change | BBCH 81-89 | K-FLOW 20: 5-6 L/ha · FULVEX 50S: 3-4 kg/ha | Maximise lycopene and sugar content and improve fruit colour and firmness for market | |
| Post-harvest and soil preparation | Post-cosecha | PHOSMAX 20: 3 L/ha · TERRA HUMID: 5 L/ha · FULVEX 50S: 3 kg/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 Tomato fertilization
Why is calcium so important in organic tomato?
+
Calcium is the most critical nutrient in organic tomato because it prevents blossom end rot, a physiological disorder caused by a local calcium shortage at the tip of the fruit. Calcium demand peaks during flowering, set and bulking. Unlike other nutrients, calcium moves slowly in the plant and only with the transpiration stream, so frequent foliar applications and fertigations with CALCIUM 40 are essential to keep adequate levels in actively growing tissue.
How often should biostimulants be applied on organic tomato?
+
In a standard programme, biostimulants on organic tomato are applied every 10-15 days through the critical stages of flowering, set and bulking. In lower-demand stages (established vegetative growth) the interval can stretch to 20-21 days. The annual total in a long greenhouse cycle can reach 12-15 applications; for outdoor crops with a shorter cycle, 6-8 is typical. Fertigation allows rates to be split and applied more often without risk of overdosing.
When should potassium be increased in tomato fertilization?
+
Potassium should rise progressively from the start of fruit bulking (BBCH 71) to full ripening (BBCH 89). From fruit set onwards the K:N ratio in the fertigation programme should increase — where in vegetative growth it is usually 1:1, in bulking and ripening it should reach 2:1 or even 3:1. Good potassium supply at this stage improves sugar content (Brix), red colour through lycopene synthesis, firmness and post-harvest life. K-FLOW 20 is especially effective here for its rapid foliar and root uptake.