Acidity (pH) is among the most important soil factors which influence plant growth and wine-grape quality.

Soil pH indicates the acidic level of a soil and is determined by the origins and composition of the soil itself. Formed of ancient rocks, such as granite or sandstone, essentially come acid soils; soils rich in humus and organic material usually feature an increase of acidity level. On the other hand, calcareous layers and pebbly-clayey substratum usually generate alkaline soils.

A pH less than 7.0 indicates an acid soil. Ph values above 7 indicates basics or alkaline soils. The area of the “Montello and Asolo hills” features different acidity levels, depending on the zone; according to the most recent zoning studies (2011), this area has mainly average acidity soils, with higher alkaline content in the hillsides of Asolo.