Tomato, especially under cover, is a crop that demands intensive and balanced nutrition. The key to yield and quality is delivering the right nutrient, at the right stage, at the right dose. This guide presents a stage-by-stage fertilization program for tomato from seedling to harvest, with product recommendations.
The Foundation: Soil Analysis
Every program should start with a soil analysis. Fertilizing without knowing your field's nutrient profile and pH raises costs and causes imbalance. Learn to take a sample in our soil analysis guide, and use our free consultancy to interpret the results.
Fertilization Program by Growth Stage
1. Seedling and Rooting Stage
The goal here is a strong root system. High-phosphorus formulations (e.g. 13-40-13) support rooting. To reduce transplant stress and accelerate root development, an application of AminoWork is recommended. Keep EC in the 1.0-1.5 mS/cm range.
2. Vegetative Growth Stage
During intensive leaf and shoot growth, nitrogen demand rises (20-20-20 or 25-10-10). To provide balanced macronutrients together with organic components, Power NPK is ideal; its humic-fulvic acid and amino acids improve uptake. Magnesium and iron supplementation in this stage reduces chlorosis risk.
3. Flowering and Fruit Set Stage
Boron and calcium needs rise at flowering, with potassium kept balanced (15-15-20). To reduce flower drop and improve set, AminoWork is critical. Avoid excess nitrogen, which can cause flower drop.
4. Fruit Growth and Ripening Stage
Potassium demand peaks (potassium-heavy formulas such as 10-5-35). Potassium drives fruit size, sugar accumulation, and shelf life. For stress resistance and fruit quality, seaweed-based RapidAlg is beneficial. Calcium nutrition and consistent irrigation are essential to prevent blossom end rot.
Common Nutrient Problems in Tomato
- Blossom end rot: caused by calcium deficiency and irregular watering. Prevented with consistent irrigation and calcium nutrition.
- Leaf yellowing (chlorosis): usually iron deficiency; quickly corrected with FerroPlus (chelated iron).
- Copper deficiency: for shoot-tip dieback, apply DoraCop foliarly. See our copper deficiency guide for symptoms.
Application via Fertigation
Delivering nutrients directly to the root zone through drip irrigation is the gold standard for tomato. For EC/pH monitoring, the A-B tank system, and correct scheduling, see our fertigation guide. For choosing NPK ratios, the NPK selection guide is a useful reference.
Success in tomato depends not on a single product, but on a balanced, stage-specific program based on soil analysis.
For a tomato program tailored to your field and variety, contact our agricultural engineers; share your soil analysis and we will build the plan together.
