Topma

Technological potential of the Topma hybrid

The white cabbage hybrid 'Topma' by Rijk Zwaan is a breeding solution tailored for intensive commercial production. The strategy behind this hybrid centers on balancing the rate of head development with high field resilience, making it a predictable tool for agronomists.

Biological protection and stress resistance

A key feature of 'Topma' is its high genetic threshold for resistance to Fusarium wilt (Fusarium oxysporum). In hot climates or under challenging crop rotation cycles where pathogen pressure in the soil increases, this resistance becomes the determining factor for maintaining plant stand density. The plant effectively resists vascular diseases, preserving leaf photosynthetic activity through to harvest.

Yield formation and physical parameters

With a growing season ranging from 70 to 80 days, this hybrid is classified as mid-early. This flexibility allows producers to adjust planting and harvesting dates according to market conditions. The plant produces a dense, round head with a distinct dark green to blue-green color. The weight range of 1.0 to 5.0 kg is a clear indicator of the hybrid's responsiveness to agricultural management: given proper spacing and quality irrigation, 'Topma' delivers an excellent yield of marketable produce.

Market specialization

The dual-purpose nature of the hybrid — suitable for both the fresh market and processing — provides farms with versatile sales channels. The dense structure of the head ensures a premium appearance for retail markets and is ideal for sauerkraut production, where high leaf density and dry matter content are critical. Rijk Zwaan’s engineers have built stability into this hybrid, effectively buffering the impact of climatic fluctuations on crop quality.