Spring radish is well-suited for greenhouse cultivation, with sowing typically done between late January and mid-February, and harvesting taking place in early April. For open field mulching, sowing occurs from late March to early April, and again from late May to early June, with harvests following accordingly.
Seeding is done by placing 1 to 2 seeds per hole, with a recommended seeding rate of 100 to 200 grams per acre. After sowing, cover the seeds with 0.5 cm of fine soil and then apply a plastic film to maintain moisture and promote germination.
Choosing high-quality varieties is essential. Opt for short-season, cold-resistant types with strict vernalization requirements, late bolting tendencies, and resistance to hollowing. Examples include spring radish varieties such as "White Jade Spring," "Spring White Jade," and "Spring Radish 9646."
Land preparation involves selecting sandy or loamy soil. The field should be plowed 2 to 3 times before sowing, with a minimum depth of 20 cm. During the final plowing, mix in 3,000 kg of well-rotted organic manure and 30 kg of compound fertilizer. Remove stones and any residual agricultural plastic during this process.
Field management begins about 4 to 5 days after sowing. Once seedlings emerge, thin them out promptly to ensure proper spacing. Check seedlings within the first 10 days and transplant those with 2 to 3 true leaves.
The ideal growth temperature for spring radish is above 12°C. If temperatures drop too low, plants may undergo premature vernalization. During the early growth stage, focus on insulation and increase the temperature inside the greenhouse to encourage rosette leaf development. In case of severe cold spells, cover the crops with insulating materials.
Spring radish generally does not require excessive water. However, timely drainage is important. Water only when the top layer of soil appears dry. During the root expansion phase, increase irrigation frequency and maintain consistent soil moisture. Drip irrigation is highly recommended for efficiency and water conservation.
Pest control includes managing aphids and cabbage caterpillars, which can be controlled using insecticides like imidacloprid, chlorpyrifos, or other suitable products. Diseases such as downy mildew and black rot can be prevented through crop rotation, improved air circulation, and good field hygiene.
Harvesting should occur when the root diameter reaches at least 5 to 6 cm. Depending on market demand, harvest in batches to ensure fresh supply and optimal quality.
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