Shed planted spring radish to control the sowing period

Spring radish should strictly control the sowing date, must not be sown early, otherwise it is easy to pass vernalization under low temperature conditions, resulting in early bolting of the plant. Greenhouse cultivation can generally be planted in mid-February and covered with plastic film. It can be planted in the middle to late March and early April. Small sheds can be covered with mulching, and sowing time can be advanced to mid-March.

The method is to sow 1 to 2 seeds per hole, and prepare the seedlings with nutrients to prepare for deficiency. Per acre sowing rate of 100 to 200 grams. After sowing, cover 0.5 cm with fine soil, then cover the film to keep moist and promote seed germination. The mulch film is required to be stretched and flattened, keeping close to the ground.

At present, the varieties of spring radish suitable for cultivation are preferably white spring, white spring, spring radish 9646 and big root of Changchun.

Do it. Spring radish has a short growth period, high yield, and requires more fertilizer and concentration. Therefore, it is very important for fine soil preparation and base fertilizer application. Choose sandy soil or sandy land for planting. Before planting, plant the soil 2 to 3 times. The depth of ploughing shall be no less than 20 cm. The soil shall be picked up at the same time as field stones, rubble, and residual agricultural film. The last time the land was turned, 3,000 kg of organic fertilizer was used in Mushi, 30 kg of ternary compound fertilizer, and 1 meter was used as a ditch. The width of the mound was 0.65 m. The surface of the mound was formed into a turtle shape; the width of the ditch was 0.35 m deep. Every 30m long dig a 50cm deep ditch, the ditch depth 60 ~ 70cm, Sangou high standard facilities to prevent the field waterlogging.

management. Generally 4 to 5 days after sowing can be seedlings, seedlings should be broken in time after the broken film induced seedlings; the first 10 days timely check seedlings make up seedlings; 2 to 3 true leaf time seedlings; "big break belly" when the Dingmiao. About 20 days after sowing, the radish began to break white. At this time, the mud was pressed against the film break to prevent the film from being lifted.

Radish growth temperature is above 12°C, and the temperature is too low for vernalization. The pre-growth period is mainly based on insulation, and the temperature in the shed is appropriately increased to promote the growth of rosette leaves. When encountering strong cold air, it must be covered with cold-proof materials. In the late growth period, the temperature rises, and ventilation should be conducted to cool down. During the day, the temperature should be kept between 20°C and 25°C, and the night temperature should be around 15°C. The shed film and greenhouse film can be gradually removed depending on the weather conditions. Generally, the film can be removed after mid-April. Open cultivation.

Radish generally does not lack of water, should pay attention to timely drainage, only in the trench when the soil is white when the appropriate watering, especially the root swelling period, the need for increased water, pay attention to soil moisture, timely irrigation. Drip irrigation is best when irrigation. 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. 30 days after sowing, the first top dressing, about 45 days for the second top dressing, 25 mu of compound fertilizer, 0.5% of the liquid fertilizer for the root irrigation, and 10 months of the culprit Shi Wen /P>

Pest control is mainly aphids and cabbage caterpillars, which can be controlled by insecticides such as imidacloprid, insecticides, and chlorhexidine. Diseases mainly include downy mildew and black rot, and agricultural measures such as field crop rotation and enhanced ventilation can be used for prevention. In addition, downy mildew can be used metalaxyl, can be killed, mancozeb, Kelu and other pesticides alternately used to control; black rot can be used agricultural streptomycin, copper preparations such as irrigation root control.

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