in trentino doc, a varietal wine is produced that is 100% nosiola with the grapes harvested to a yield no greater than 14 tonnes/ha and a minimum alcohol level of 10.5% nosiola is also the only permitted variety in the sweet "vin santo" style wine produced in the doc from grapes harvested to the same yield restriction as the varietal wine but with a minimum alcohol level of 16% and an additional requirement that the wine receives at least three years of aging in oak and the bottle prior to release.