1. The seedlings can emerge 4 to 5 days after sowing. After emergence, the seedlings should be broken in batches and introduced in stages. The seedlings grow to 2 to 3 leaves. About 20 days after sowing, the succulent roots of the radish began to swell. At this time, the rupture of the film should be pressed with mud to prevent the film from being lifted.
2. The suitable temperature for the growth of radish is above 12 ℃. The management of early growth should be based on heat preservation, appropriately increase the temperature in the shed, and promote the growth of rosette leaves. In the case of strong cold air, it is necessary to cover the cold. When the air temperature rises later in the growth period, it is necessary to timely ventilate and cool down. During the day, control the temperature in the shed between 20 ° C and 25 ° C. At night, control the temperature in the shed at about 15 ° C. Depending on the weather, gradually remove the small shed film and the large shed film. After mid-April, the shed film can be removed for open field cultivation.
3. Watering is generally not required during the growth of radishes, but only when the soil in the trench is white. The radish needs more water during the fleshy root expansion period. Depending on the soil conditions, drip irrigation is preferred. If furrow irrigation is used, it should be carried out at noon on a sunny day.
4. 30 days after sowing for the first fertilizer, 45 days or so for the second fertilizer. When topdressing, 25 kg of compound fertilizer per acre can be used to irrigate roots with a liquid concentration of 0.5%. If the soil is relatively humid, it can be applied at a hole 10 cm from the root of radish.
5. Pest and disease control. The main pests are aphids and cabbage worms, and the main diseases are downy mildew and black rot.
6. Harvest in time. When the succulent root is more than 5 cm in diameter and weighs about 0.5 kg, it can be harvested in batches. When harvesting, the petiole is cut for 3 to 5 cm, and it is put on the market after cleaning. If it is transported over long distances, do not clean it.
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