How to prevent the black skin and black heart of the radish

Planting radish in the spring with improper technologies will easily occur black skin and black heart, which will decline the marketability of the radish. So prevention of the black skin and heart of radish is a key technology to cultivate spring radish.
1. Reasons. First is the deficiency of borax; second is the bad ventilation of the soil; third is the black rot.
2. prevention measures: Take different measures according to different reasons. First, supply borax fertilizer to the soil. Use 1kg borax fertilizer as basic fertilizers per mu. Or spray borax solution once or twice during the middle growth period of the radish. Second, dig deep ditch and high seedbed, clear the weeds and supply organic fertilizer to prevent the soil to harden. Increase the ventilation ability of the soil. Third, disinfect the soil before sowing. Use chemical solution to spray the soil 3-4times in a row.