The main growing season of summer celery is in June, July and August. High temperature and strong light affect the growth of celery, making its quality worse. It adopts greenhouse shading net cultivation, which can be harvested and marketed in batches in mid-September.
First, select good varieties. Should choose heat-resistant, disease-resistant, good quality varieties, generally hollow varieties are more heat-resistant, such as flatness yellow leaf hollow celery, new Thai celery, etc., some solid varieties such as Kaifeng glass crisp, Italian parsley, etc. Adaptability.
Second, stubble. Summer celery is usually broadcast live from May to June, so it can be used for early cultivation of cabbage, zucchini, cauliflower and other crops in the greenhouse, as well as early spring lettuce and overwintering root stubble.
Third, sowing. After the previous crops were harvested, the crops were stubbled and prepared in time, and every 1/15 hectare was applied with 3000 kg of high-quality rotten farm fertilizer, 20 kg of urea, and 50 kg of superphosphate. After ploughing and raking, make a flat hoe with a width of about 1.5 meters.
Select old seeds every other year, use 3.5 to 4 kg per 1/15 hectare, soak in warm water at 48 ° C for 30 minutes, then soak in cold water for 24 hours, remove and wrap with wet gauze, and place at 15 ° C-20 ° C Sprouts are germinated under the conditions and can be germinated and seeded in 5 to 6 days, during which time they are washed with cold water every day. Seeding should be watered in advance, and can be broadcasted or drilled when sowing. Cover the soil with 0.5 to 1 cm when sowing, and the trench distance is 15 cm when sowing. After sowing, cover the greenhouse shading net, and spray water once in the morning and evening.
24. Strengthen post-broadcast management.
1. Weeding. Immediately after sowing, the ground was weeded with 48% dilenamine EC, and every 1/15 hectare with 200 g of water and 35-40 kg of water, or sprayed with 100 g of 33% weed control EC.
2. Shade. Excessive light can inhibit the growth of celery, so it is necessary to cover it with a shade net in time. Generally keep the old film on the roof to protect it from rain, and cover the film with SZW-8 black shading net. The lower part of the shading net is not covered to maintain ventilation, and the shading net is not covered on cloudy days and at night.
3. Between Ding Miao. When the seedlings have 1 true leaf, perform the first thinning, and maintain the seedling distance of 1 to 1.5 cm, and when the 2 to 3 true leaves, perform the second thinning, maintain the seedling distance of 2-3 cm, and set the seedlings when 5 true leaves , Miao distance of about 5 cm.
4. Fertilizer and water management. After the celery emerges to 20 days before harvest, to keep the ground moist, it is best to water it 1 to 2 times a day to meet the growth of the seedlings and reduce the ground temperature. Combined with watering every 10-15 days after seedling setting, 5-10 kg of urea was applied every 1/15 hectare.
5. Spray gibberellin. about 15 days before harvesting, spraying with a gibberellin solution of 30 mg / L 1 or 2 times at intervals of 7 days each time can significantly increase the yield.
6. Strengthen pest control. During the growth of summer celery, attention should be paid to using low-residue pesticides to control spot disease, virus disease, soft rot and aphids.
7, timely harvest. Summer celery is prone to fibrosis, so the plant should be harvested in time.