1. Seedlings can be emerged 4 to 5 days after sowing, and the seedlings must be broken and seeded in stages in a timely manner after seedling emergence. Seedlings grow to 2 to 3 leaves during seedlings. About 20 days after sowing, the fleshy root of the radish began to expand. At this time, the mud was pressed against the film break to prevent the film from being lifted.
2, spring radish growth temperature is above 12 °C. The management of the early growth period should be based on heat preservation, appropriately increasing the temperature in the shed, and promoting the growth of rosette leaves. In case of strong cold air, cold-proof materials should be stamped. In the late growth period, when the temperature rises, it should be ventilated and cooled in time. During the day, the temperature in the shed is controlled between 20°C and 25°C. At night, the temperature inside the shed is controlled at about 15°C. The shed film and greenhouse film are gradually removed depending on the weather conditions. After the middle of April, the greenhouse film can be removed for open cultivation.
3, the spring radish growth process does not generally require watering, only in the trench when the soil is properly white watering. During the root swelling period of radish, the water requirement is larger, and it may be better to use drip irrigation when water can be soaked in soil moisture. If furrow irrigation is used, it should be carried out at noon on sunny days, and the water should be ditched and drained for 2 hours after filling.
4. The first topdressing will be carried out 30 days after sowing and the second top dressing will be carried out around 45 days. When composting, 25 kg of compound fertilizer per acre can be used to irrigate the root of the liquid fertilizer with a concentration of 0.5%. If the soil moisture is high, it can be applied at a depth of 10 cm from the root of the radish.
5. Pest control. The pests are mainly aphids and cabbage caterpillars, which can be controlled by pesticides such as ecbenaryin and insecticides. The diseases are mainly downy mildew and black rot, which can be prevented by adopting crop rotation and enhanced ventilation. Such as the use of drugs to prevent disease, downy mildew can be alternately sprayed to kill, mancozeb and other liquid medicine, black rot available agricultural streptomycin, copper preparations and other liquid irrigation.
6, timely harvest. When the fleshy root diameter is more than 5 cm and the weight is about 0.5 kg, it can be harvested in batches. When harvesting petiole leaves 3 to 5 centimeters cut, cleaned after listing, if you do long-distance transportation, do not wash.
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