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Grape vine
Magnesium and sulphur
| Required for: |
Yield, sugar: acid ratio, controls shanking, increases brix of berries and flavour of the wine
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| High deficiency risk: |
Mg: |
Sandy soils, soils that receive large amounts of K+ on calcareous and acid soils
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S: |
On green cover vineyards during low rainfall seasons
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| Deficiency symptoms: |
Mg: |
First chlorosis of basal leaf margins, than between primary and secondary veins, leaf margin burn may develop, interveinal areas become white/yellow or red depending on variety
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S: |
Whole orchard or spot-wise stunted growth of pale-green plants
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| Recommendations: |
For yields between 7 – 35 t/ha, depending on production goal (quality wine, fresh fruit), 20 – 200 kg Kieserite/ha are recommended as maintenance dressing (soil fertility class C). On calcareous or acid soils 1.5-2.0 times that amount is needed to balance the antagonistic effects of Ca2+ or Al3+, respectively. Foliar applications of
2-3% Epsom Salt sprays are recommended if soil supply is insufficient due to temporal drought.
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Typical Mg deficiency symptoms of a white grape wine variety.
Typical Mg deficiency symptoms of a red grape wine variety.
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