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Quinta classification of Port vineyards in the Douro
The Quinta classification of Port vineyards in the Douro is a system that grades the ''terroir'' and quality potential of vineyards in the Douro wine region to produce grapes suitable for the production of Port wine. In Portuguese, a ''quinta'' is a wine producing estate, which can be a winery or a vineyard. While other wine classification systems may classify the winery (such as the 1855 Bordeaux classification), the Douro quinta classification is based upon the physical characteristics of the vineyard. The classification system is run by the ''Instituto dos Vinhos do Douro e Porto'' (IVDP) and shares some similarities to the classification of Champagne vineyards in that one of the purposes of the system is to ensuring that vineyards producing grapes with the highest quality potential receive a high price. A secondary function of the quinta classification is the establishment of permitted yields for production. Quintas with a higher classification (and theoretically capable of producing grapes of higher quality) are permitted to harvest more grapes than a vineyard that received a lower classification.〔 T. Stevenson ''"The Sotheby's Wine Encyclopedia"'' pg 334-336 Dorling Kindersley 2005 ISBN 0-7566-1324-8 〕
==History==
The origins of this system dates back to the quality control regulations installed by Sebastião José de Carvalho e Melo, Marquis of Pombal in the mid 18th century. In the early 18th century, British Port producers (known as "shippers") had tight control over the Port industry, including the leverage to dictate pricing for grapes grown in the Douro valley. A series of scandals hit the Port wine industry, including practice of wine fraud and adulterating poor quality Port with grapes grown outside the region or with foreign ingredients such as elderberry juice, which had the economic impact of driving down Port wine sales and prices across the board. Following complaints by Portuguese wine growers over the business practice of the British and dealing with the growing economic crisis in the Port wine trade, the Marquis of Pombal established the Douro Wine Company with the power to install quality control regulations in the Port industry.〔 H. Johnson ''Vintage: The Story of Wine'' pg 226-229, 325-328 Simon and Schuster 1989 ISBN 0-671-68702-6 〕
One of these powers was establishing licenses for growers of Port wine grapes and dictating limits or "quotas" for what could be harvested. These quotas (known as the ''beneficio'') would change with each vintage depending on the quality of the vintage and on the current conditions of the wine market.〔R. Hersh ''"(The Methuen-Pombal Link and the Demarcation of the Douro )"'' For the Love of Port, 2006 Accessed: December 16th, 2009 〕 These measures were enacted to ensure that the market wasn't flooded with Port and that the wines that were available were of high quality and not something that could tarnish the reputation of the Douro.〔 Over the years the system of licensing growers turned into a rating classification operated by the IVDP. The system only pertains the production of Port. A quinta that is growing grapes for both Port and table wines, can do whatever they like with the grapes destined for table wine production regardless of its classification rating. Each year the IVDP classifies and rates the vineyards on an A-F scale with A being the highest level. A quinta's rating will dictate the permitted production level of the vineyard and what price the grower can receive for the wine they produce from the grapes.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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