Bitter orange

Bitter Orange (Citrus aurantium) is an important fruit in Türkiye, both for agricultural production and industrial use. It is commonly used as a rootstock for species such as orange, lemon, and mandarin. Additionally, it is valued in the production of jams, marmalade, perfumes, and pharmaceuticals.

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Bitter orange thrives in subtropical climate conditions. It is sensitive to low temperatures and can suffer damage at temperatures below -4°C. Therefore, in Türkiye it is cultivated primarily in the Mediterranean and Aegean regions, as well as in certain coastal areas of the Eastern Black Sea.

In terms of soil, bitter oranges prefer well-drained, slightly acidic (pH around 6), and organic matter-rich soils. Their roots can reach depths of 30 to 90 cm, so the soil depth should be at least 1.5 to 2 meters. The most critical factor is that the soil must have a well-aerated structure, as bitter orange roots require high levels of oxygen and are highly sensitive to anaerobic conditions. They quickly show signs of distress in heavy, poorly aerated soils.

Development rates increase significantly up to temperatures of 18–20°C. Growth reaches its peak at 26–28°C, which is the point of maximum growth rate and highest photosynthetic activity. Development and growth slow down at 30–32°C and nearly cease at 38–39°C, reaching their lowest level. Growth is minimal below 12.8°C and practically nonexistent.

Bitter orange is primarily used as a rootstock in citrus production. It is preferred for grafting trees such as orange, lemon, and mandarin. Additionally, its fruit is used in jam and marmalade production, while the essential oils extracted from its peel are valuable in the perfume and cosmetics industries.

Citrus production in Türkiye is concentrated primarily in the Mediterranean Region. Major production occurs in Mersin, Adana, and Hatay, as well as in provinces such as Antalya and Muğla. In 2020, Türkiye produced a total of 4.3 million tons of citrus fruits.

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Pruning, fertilization, and disease control are essential in citrus cultivation. Pruning is necessary for healthy tree development and productivity. Fertilization should be carried out based on soil and leaf analyses.

For disease control, especially against viral diseases, the use of certified planting material is recommended. In Türkiye, citrus virus eradication programs are underway to produce healthy planting material.

Bitter orange holds an important place in Türkiye both in agricultural production and industrial applications. When cultivated under suitable climatic and soil conditions, it yields high productivity and quality. Furthermore, its use as a rootstock in citrus production further enhances its significance.