MINERAL NUTRITION AND YIELD QUALITY IN GRAPEVINES TRAINED TO VERTICAL TRELLIS OR SINGLE CURTAIN HAND OR MACHINE PRUNED

In addition to the usual quantitative and qualitative surveys, leaf analysis were carried out on vines (cv "Barbera") trained to vertical trellis or single curtain, mixed or spur hand pruned, or machine pruned.
At veraison leaf concentrations of N, P, Ca, Mg, K, Fe, Mn, Zn, Cu and B and leaf areas were measured.

The vineyard was in a quite good nutritional status: there were slight deficiencies only for P, N and Mg.
Higher contents of N, Mn, Cu and B and lower contents in P and K were found in the vines trained to single curtain compared to those trained to vertical trellis which, instead, had leaves of larger areas and fresh mass.
Mechanically pruned vines had leaves of smaller areas and lower fresh and dry mass than the hand pruned ones.
The yield of mechanically pruned vines had higher quantity but lower quality (less sugars and more acids) than the hand pruned vines.

Strategies to Optimize Wine Grape Quality

M. Bovio, L. Lisa

Vitis vinifera L., foliar analysis, ripening evolution, must quality

https://doi.org/10.17660/ActaHortic.1996.427.23