Copper F1

An Engineering Approach to Onion Longevity

The Kopra F1 hybrid, developed by the Dutch breeding company Bejo, is a benchmark "long-day" variety engineered for stable performance in intensive agricultural systems. Its core value lies in a genetic architecture specifically designed to overcome major phytopathological barriers associated with bulb onion production.

Biological Defense and Resilience

The productivity of Kopra F1 is anchored by its enhanced resistance to Pink Root (Pyrenochaeta terrestris). Under field conditions, this translates into the preservation of root system integrity against hostile soil conditions, which is essential for biomass accumulation during peak growth phases. The plant’s inherent defense mechanism minimizes the risk of rot during the growing season, ensuring a high yield of marketable output.

Morphology and Technical Specifications

• Bulb Structure: The rounded shape and dense flesh facilitate efficient mechanical harvesting and automated grading processes.
• Tunics: The dark bronze skin color provides both high market appeal and robust protection against physical damage during logistics and transit.
• Biochemistry: With a dry matter content of 10–12%, this hybrid is optimized for both industrial processing requirements and extended shelf life.

Storage as a Key Economic Driver

A maturation cycle of 100–110 days allows for precise, concentrated harvest scheduling. The technical potential of this hybrid ensures a storage capacity of 5–6 months without significant quality degradation. High bulb density, coupled with the quality of the outer scales, reduces decay losses in facilities utilizing active ventilation systems. Kopra F1 provides a balanced, reliable solution for growers focusing on industrial processing and long-term market distribution.