Question

What is the effect of soil water-holding capacity on concentration of sugar in grapevine berries?

Answer 1

Those soilswhich induce moderate water deficit are considered to be the best for grapevine
cultivation. An early water deficit provokes early shoot growth cessation
and reduces berry size. Under these conditions, berry sugar and anthocyanin
concentrations are increased because of greater ripening speed. Total acidity
is reduced, as berries contain less malic acid. Grape quality is high on the
soils that induce water deficit, especially on clayey soils.