Because grapevine is a perennial crop, its nutrition must be planned within an annual cycle. The right program directly affects shoot vigour, cluster number, berry size, and sugar content. This guide presents a stage-by-stage fertilization program for the vineyard from bud break to harvest, with product recommendations.
The Foundation: Soil Analysis
Vineyard soils are often calcareous with high pH, which hinders the uptake of trace elements, especially iron. So the program must start with a soil analysis, with results interpreted by our agricultural engineers.
Fertilization Program by Growth Stage
1. Bud Break and Shoot Stage
As buds break in spring, the goal is balanced nutrition and strong shoot growth. Power NPK supplies macronutrients together with organic components. If late spring frost is a risk, an application of AminoWork helps reduce frost damage by improving stress resistance.
2. Flowering and Fruit Set Stage
At flowering, amino acid support along with boron and zinc improves fruit set and reduces shatter. AminoWork is critical here. Avoid excess nitrogen, which can cause loose clusters.
3. Berry Growth and Veraison Stage
As berries enlarge and colouring begins, potassium demand rises. For stress resistance, tissue firmness, and trace-element uptake, seaweed-based RapidAlg is beneficial.
4. Ripening Stage
Potassium drives sugar accumulation and colour development, so potassium-led nutrition is preferred. Nitrogen is reduced in this stage, improving ripening and shelf life.
5. Post-Harvest
After harvest, the vine's nutrient storage for the following year matters. Balanced nutrition before leaf fall supports strong bud formation and next year's yield.
Common Nutrient Problems in the Vineyard
- Iron chlorosis: very common on calcareous soils; young leaves yellow between veins while veins stay green. Quickly corrected foliarly with FerroPlus (chelated iron).
- Copper deficiency: for weak shoot tips, apply DoraCop foliarly; see the copper deficiency guide for symptoms.
- Potassium shortage: shows as low sugar and poor colour; potassium nutrition during ripening is essential.
Application via Fertigation
In drip-irrigated vineyards, delivering nutrients directly to the root zone saves water and fertilizer. For EC/pH management and scheduling, see our fertigation guide, and for ratio selection the NPK selection guide.
Quality grapes come from balanced nitrogen, well-timed potassium, and trace-element management on calcareous soils.
For a program tailored to your vineyard and variety, contact us; share your soil analysis and we will build the plan together.
