Denizli Çalkarası Grape

Denizli çalkarası grape, also known as Denizli çalkarası, is a medium-sized, oval-shaped grape variety native to the Çal district of Denizli Province, characterized by a purplish-black color. This grape is notable for its fleshy and juicy structure; its clusters are dense, winged, and large, with a medium-thick skin.

Distinctive Characteristics

Denizli çalkarası grape is a unique variety within grape types, recognized by its distinctive purplish-black color. The berries are oval-shaped, fleshy, and juicy, with a medium size containing one to two seeds. The skin is of medium thickness. The clusters are dense and winged, with dimensions ranging from 230–250 mm in length and 100–120 mm in width. Each berry measures 13–15 mm in length and 12–14 mm in width, with an average weight of 182–190 grams for 100 berries.

The physicochemical properties of the product include a total soluble solids (TSS) content of 20.8–21.3%, titratable acidity (expressed as tartaric acid) of 5.43–5.73%, juice yield of 40.24–44.68%, and a pH range of 3.64–3.84. The ripening period coincides with the end of August.

Geographical Area and Climatic Conditions of Cultivation

The grape is cultivated within the boundaries of the Çal district of Denizli Province. The district lies at an elevation of approximately 850 meters and is situated in a transitional climatic zone. Due to its distance from the sea, the continental climate is dominant, resulting in significant diurnal and seasonal temperature variations. The annual average temperature is 12.5°C, with a recorded maximum temperature of 40.2°C and a minimum of -24°C.

The Çal district is influenced by the Mediterranean rainfall regime, with an annual average precipitation of 44.4 kg/m². Seasonal distribution of rainfall is as follows: 38.3% in winter, 30.5% in spring, 24% in autumn, and 8.7% in summer. These microclimatic conditions play a decisive role in shaping the sensory and physical properties of the product.

Production Method

Plant Material Acquisition

American rootstocks resistant to phylloxera and nematodes (110R, 41B) are used, and grafting is performed on these rootstocks. Vineyards reach full productivity after approximately five to six years.

Cultural Practices

• Soil Preparation: The land is deeply tilled and left fallow before vineyard establishment. Planting density is 2–2.5 m between vines and 3–3.5 m between rows, with a planting depth of 50–70 cm. Sandy and loamy soils are preferred. Soil pH ranges from 8 to 8.5.
• Fertilization: Organic manure is applied during October–November. After pruning, a 4% Bordeaux mixture is used to prevent fungal diseases. Compost application may also be carried out at this stage.
• Pruning: Intermediate pruning is conducted in December–January, while main pruning is performed in February–March using short pruning methods. Pruning involves retaining 15–30 buds. The average vegetative period is 160 days.
• Green Pruning: Leaf removal, shoot thinning, and tip pruning are carried out to enhance air circulation and positively influence the development of fruiting canes.
• Irrigation: Irrigation is generally not practiced in this region’s viticulture.
• Pest and Disease Control: Spraying is applied against mites, downy mildew, powdery mildew, botrytis, and grape berry moth.
• Harvest: Harvest begins in mid-August. Harvest criteria include the development of purple coloration in berries, total soluble solids exceeding 23%, and browning of the pedicel and seeds.

Monitoring and Inspection

Inspections are carried out by a team of at least three members coordinated by the Çal Chamber of Agriculture, in collaboration with the Çal District Directorate of Agriculture and Forestry, Pamukkale University Çal Vocational School, and Çal Municipality. Inspections are conducted at least once annually and may be repeated as necessary or upon complaint. The inspection covers plant material sourcing, cultural practices, and the proper use of the geographical indication. Product analysis may be requested when needed. Experts from both public and private sectors may collaborate during the inspection process. The registering institution is legally responsible for protecting the geographical indication rights of the product through legal means.

Labeling and Use

The designation “Denizli Çalkarası Üzümü” or “Denizli Çalkarası” along with the geographical indication emblem must appear on the product itself or its packaging. If this is not feasible on the product or packaging, the relevant designations must be visibly displayed within the production facility.