Heat

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In agriculture and viticulture, this term refers to a state of persistently high temperatures that are significantly above the long-term regional average and affect the balance of the vine 's water and metabolism. The heat often works in combination with drought, as high temperatures increase the water consumption of the vines and quickly dry out the soil. Soil water supply, air temperature, humidity and evaporation are the main factors in assessing the effects.

Effects

High temperatures lead to accelerated vine development and can bring forward ripening significantly. In the process, more malic acid is broken down under heat, which leads to wines that are richer in alcohol but lower in acidity and less precise in flavour. Extreme temperatures can also impair the formation of colour pigments, resulting in red wines with a weak colour and a reduced ageing capacity.

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Effects

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