Soprano

Corm Formation Technology of 'Soprano'

The 'Soprano' fennel variety, developed by Agrofirma Poisk, represents a selection achievement focused on high-yield production with a predictable plant architecture. Unlike wild-type fennel, where plant energy is largely diverted to inflorescence, this variety is optimized for the intensive thickening of the leaf petioles at their base. The breeding work conducted by N.N. Klimenko and S.V. Maksimov specifically targeted a phytohormonal balance that promotes the hypertrophy of the basal part, forming the desired commercial bulb.

Morphological Profile and Agronomic Potential

• Structural Geometry: The oval shape of the bulb is achieved through the tight packing of the petioles, minimizing internal voids. This is a critical factor for post-harvest logistics; such density effectively reduces the risk of mechanical damage and deformation during transit.
• Coloration: The clean white appearance of the bulb is a key quality marker. The absence of chlorophyll in the root zone indicates proper hilling practices and the lack of fibrous, woody textures common in greener varieties.
• Flavor Matrix: The characteristic sweet undertone is driven by the accumulation of essential oils (anethole) and a balanced sugar content, making this hybrid highly prized in the HoReCa sector for fresh-cut applications.

From an agronomic perspective, 'Soprano' requires strict photoperiod management. As a long-day plant, fennel is susceptible to premature bolting if planting schedules are not followed. The variety from Agrofirma Poisk shows resilience to temperature fluctuations, which helps mitigate the risk of early flowering, provided irrigation is stable. Irrigation management is the most critical variable: excessive moisture levels can lead to bulb splitting, while drought stress results in toughened fibers and an increase in bitterness, masking the distinct sweet profile of the cultivar.