Kırıkkale Kılıçlar Onion

Kırıkkale Kılıçlar Onion is a local dry onion variety cultivated in the village of Kılıçlar, within the Yahşihan district of Kırıkkale Province in Turkey’s Central Anatolia Region. It has been officially registered as a geographical indication under its place of origin name on 6 July 2018 under Law No. 6769 on Industrial Property, with the registration carried out by the Kırıkkale Municipality.

Botanical Characteristics and Origin

The Kılıçlar onion is a bulb onion belonging to the species Allium cepa L. of the family Alliaceae. While the broad geographic region extending from Asia to Anatolia is recognized as the center of origin for onions, the village of Kılıçlar stands out as an area where a local variety of this species has been cultivated for many years. The seeds used for production have been collected by the local community for approximately a century, resulting in a population shaped by cross-pollination. This genetic structure, combined with the region’s climate, soil conditions, and the fertility provided by the Kızılırmak River’s irrigation, has produced a distinctive product.

Physical and Chemical Properties

The Kırıkkale Kılıçlar onion has a flattened bulb structure. Plant height ranges from 10 to 40 cm, bulb diameter from 8 to 11 cm, and bulb length from 5 to 7 cm. Neck thickness varies between 0.4 and 1 cm, while bulb weight ranges from 100 to 750 grams. The outer skin typically consists of 1 to 2 layers, and the fleshy leaves number between 5 and 8, each with a thickness of 5 to 7.5 mm. The outer skin color is brownish-red, while the fleshy leaves exhibit a white-to-red transition tone. The dry matter content is 11–12%, and the water-soluble dry matter content is 8–9%. The vitamin C content per 100 grams of bulb is measured at 6.4–7 mg. Due to its protocatechuic acid content, the onion has a mild pungent taste.

Although it exhibits characteristics of a short-day plant, the Kılıçlar onion also displays traits of a long-day onion due to its extended growing period and its ability to be stored in simple conditions until February. This dual adaptability enhances the product’s market value.

Agricultural Production Process

Soil preparation begins in September–October with plowing to a depth of 30 cm, followed by a second tillage and leveling in February–March. Seeds are sown manually and covered with a harrow. Fertilization is carried out using diammonium phosphate (DAP) and urea; DAP is applied at sowing, while urea is applied in two stages. Irrigation is performed 7–8 times depending on rainfall conditions; sprinkler irrigation is preferred when rainfall is insufficient, and flood irrigation is used during the growth phase.

Cultivation is carried out to control weeds and loosen the soil. Chemical methods are used for pest and disease control. After harvest, onions are left to dry in the field and are pulled in August. The leaves are cut, and the bulbs are sorted by size before being marketed.

Ecological Conditions

The soils of Kılıçlar village are clay-loam in texture, with a slightly alkaline pH, moderate lime content, and low salinity. Although organic matter levels are low, they are supplemented with farmyard manure. The soil is rich in potassium and iron but has moderate phosphorus levels. The region has a continental climate with hot, dry summers and cold, wet winters. Rainfall between January and May is sufficient for onion development.

Monitoring and Protection

The protection of the product under the geographical indication framework is coordinated by the Kırıkkale Municipality. The monitoring authority conducts two annual inspections, each involving one expert from Kırıkkale University, the Provincial Directorate of Food, Agriculture and Livestock, and the Chamber of Agriculture. The first inspection takes place in May–June on the fields, and the second occurs in August–September on the harvested product. Inspection reports are submitted to the Turkish Patent and Trademark Office; legal proceedings are initiated against individuals or institutions that fail to comply with the established procedures.