If you read French it can also be quite interesting to read the remarks of Carole Duval-Leroy, owner of Champagne Duval-Leroy: “If it becomes a norm to produce 21,700 kg grapes (ed.: ~140 hl/ha) and then only use 15,500 kg (ed.: 90-100 hl/ha), what happens then when the reserve stocks are filled?” (Reserve stocks are filled with excess volumes over the permitted yield.) Read her comments here: www.reussir51.com
