(Decanter) -Rioja producer Oscar Tobia is experimenting with alternatives to oak barrels for ageing and plans to release a blended white wine partially matured in chestnut and ash.

Rioja producer Oscar Tobia is experimenting with alternatives to oak barrels for ageing and plans to release a blended white wine partially matured in chestnut and ash.

Tobia commissioned a cooperage to produce barrels from acacia, chestnut and ash that would sit alongside American oak in the cellar of his namesake estate Cuzcurrita de Rio Tiron.

He has 120 barrels covering those four different woods and is using them to mature five of the white grape varieties allowed in the Rioja DOCa: Viura, Garnacha Blanca, Tempranillo Blanco, Chardonnay and Sauvignon Blanc.

While there is still one more year of the three-year trial left to run, Tobia told Decanter.com that he plans to produce a white blend encompassing wine from all four barrel types.

Tobia established a reputation as an experimental winemaker in Rioja shortly after he founded his estate in 1994. He spent the first two years persuading the regional wine trade council to change its rules to allow him to produce an oak fermented rose wine.

His new cellar trial comes amid growing exposure for white Rioja, partially fuelled by the DOCa council's decision to allow greater quantities of so-called international varieties, Chardonnay and Sauvignon Blanc, to be put into blends.