Increasing grape berry set and weight
Nitrogen and phosphorus are significant in increasing wine grape berry set and weight.
Nitrogen
Trials show that applications of nitrogen at flowering increases wine grape berry set. High rates of N will increase wine grape yield. In work by Nielsen et al, N yield responses hadn`t peaked at applications of 300kg/ha and there was a similar correlation with grape bunch weight in two out of three years of this trials.
Phosphorus
Most of the phosphorus comes from soil reserves as grapes are good at extracting phosphorus from the soil. Phosphorus is also very mobile in the vine. Where phosphorus is naturally low in soils, applied fertilizer phosphate increases wine grape berry set and crop yield.
Recommended Yara fertilisers for grapevines
How nutrient management affects wine grape
Influencing grapevine yield
High grapevine yields are obtained on the most freely drained soils where water is not limiting. Vines will grow across a wide range of soil pHs, but extremes will render many nutrients unavailable and thereby restrict yield.
Increasing grape berry set and weight
Nitrogen and phosphorus are significant in increasing wine grape berry set and weight.
Improving grape quality
The aim of any grower is a high yielding, top quality wine grape that satisfies the wine-maker. Both yield and quality are strongly influenced by nutrition.
Influencing grape and wine pH
Strong vine canopies can lead to excessive nitrogen and potassium uptake, which increases grape and wine pH.
Grape nutrient deficiencies
Identify and diagnose if your grapes are suffering from nutrient deficiencies and learn more about the symptoms and causes and how to control or correct the deficiency
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