A study on Chasselas grapevines shows that yield regulation by cluster thinning after foliar fertilisation does not increase grape nitrogen concentration but does encourage N accumulation in the perennial parts of the vine.
An Agroscope study shows that pre-flowering removal of the main leaves instead of the lateral shoots appears to be a viable practice with a moderate effect on both yield potential and must composition.
Foliar fertilisation around veraison improves grape nitrogen levels without affecting vigour. A trial shows that the fertilisers ‘Safe N 300’ and ‘Folur’ effectively increase assimilable nitrogen in the grape must; however, their degree of effectiveness depends on climatic conditions.