Growing Napa cabbage in protected ground requires strict control of photoperiod and temperature regime to prevent bolting and ensure head formation.
In the reference
25
varieties
crop Napa cabbage,
where this is mentioned in the description.
The optimal temperature range for the crop is +13…+18 °C. A decrease in temperature below +10 °C during the seedling stage or overheating above +25 °C during the head-setting phase triggers the transition to flowering and the formation of flower stalks instead of marketable produce. Due to the high sensitivity of Napa cabbage to photoperiod, it is necessary to eliminate exposure to long light days and use hybrids resistant to bolting.
The delicate root system of the crop excludes standard transplanting methods; therefore, it is recommended to grow seedlings in individual containers. An important aspect of agronomic practice is the prevention of a physiological disorder — tipburn, caused by calcium deficiency, as well as the control of nitrogen fertilization levels to limit nitrate accumulation in the produce.
Varieties of Napa cabbage mentioned in the description
Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.