Technical Yearbook 2024

PHOTO 4. Here the effect of harvest time on reserve levels can clearly be observed. The part of the block to the right was harvested early for low-alcohol wine production, while the left side was harvested a month later at higher sugar levels. Note the differences in canopy size and activity. Post-harvest treatment Irrigation must be applied to ensure effective photosynthesis. Guard against overirrigation, as the vine’s water requirement is considerably less during this period. Fertilisation must be applied in a timely manner considering soil analyses, as well as vigour and realised yield, which determines nitrogen norms. Protect leaves against untimely fungal infections and prevent regrowth where possible by avoiding stress.

PHOTO 5. Regrowth after harvest will lead to unnecessary utilisation of reserves before budding, resulting in lower reserve levels during budding.

By paying careful attention to all the factors that promote the establishment of carbohydrate reserves, simple management practices can lead to sustainable vineyard blocks. Well-buffered vineyards with sufficient carbohydrate reserves are able to handle climate fluctuations and unforeseen challenges better than those that are already teetering on the edge. 

Reference https://www.wineland.co.za/the-vines-reserve-bank/ For more information, contact Hennie Visser at henniev@vinpro.co.za.

131

TECHNICAL YEARBOOK 2024