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Irrigation

The supply of water in the right quantity and at the best possible time is an important prerequisite for the growth of the vines and is indispensable for photosynthesis. This takes place naturally through precipitation (rain), the required amount is usually between 500 and 750 mm per year (depending on climate, soil type and grape variety). With ideal soil conditions, however, larger amounts of precipitation can also be absorbed. In Portuguese Vinho Verde, the amount of precipitation is 1,500 mm.

Bewässerung - Anlagen in einem Weingarten

Water shortage

In addition to the quantity, the timing of the annual vegetation cycle also plays a major role. The "right" amount of water is important; too little moisture can lead to water stress or drought stress, while excessive rain can lead to excessive vegetation (foliage growth). Rain is particularly undesirable during the grape harvest and leads to poor wine quality due to the dilution of the grape must. In extreme cases, moisture stress occurs, in which the berries swell or burst open, causing the grape must to oxidise or even ferment.

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