Black Radish: Open Field Cultivation

Black radish is a long-day crop; therefore, spring sowing often leads to the formation of flower stalks instead of root crops. For harvest intended for storage, the optimal sowing time is considered to be late June or the first half of July, when day length begins to decrease.

The cultivation technique for this crop excludes the application of fresh organic matter directly before sowing due to the risk of root cracking and deformation. Mineral fertilizers are preferred, transitioning from nitrogen-based in the early growing stage to phosphorus-potassium fertilizers during the active phase of root growth.

Given that it belongs to the Brassicaceae family, crop rotation requires the exclusion of cruciferous predecessors to reduce the risk of clubroot infection. Stable soil moisture is critical for developing flesh quality, and a sparse planting scheme with 45–50 cm row spacing ensures an optimal feeding area.