First, the choice of varieties in the summer cultivation of celery should be selected resistant varieties of high temperature, multi-select American Beli celery, Ventura celery, Shuanggang celery and other varieties for summer cultivation. Second, timely sowing 1. Sowing period using plastic greenhouse insulation seedlings, in late February ~ early March sowing, sowing too early and easy bolting, sowing too late affect the yield and quality, and this period of planting can ensure that the province in summer celery It will be listed before mid-July to avoid the impact of the "Northern Food Nanping" celery after mid-July and reduce the benefits. 2. Seeding rate Celery seed germination rate is relatively high, the general amount of 667m2 can be 50 ~ 100g. 3. Treatment before sowing (1) Seed treatment Seeds are soaked in clean water at 15~20°C for 24h before sowing. The mucus is removed from the surface of the seeds. The seeds are drained after washing and cleaned, and wrapped in wet gauze at a temperature of 15 to 20°C. In the process of germination and germination, the seed is turned every 8 hours or so, and the surface of mucus is flushed with water. About 7 days or so, about 70% of the seeds can be sown when exposed. (2) Seedling treatment 7~15 days before sowing in the greenhouse for more than 3 years, no celery and other Umbelliferae plants were planted, wet and water-free sorghum was used as seedbed, seedbed was applied at 5000 kg per 667m2 of composted organic fertilizer. Fertilize the base fertilizer, deepen the fine mash, and disinfect the bed with quintozene. The seedbed area is 1/8 to 1/5 of the planted area. 4. Seeding techniques When planting seedlings should be poured foot water, because the celery seed is small, the seed and fine sand mixed in a ratio of 1:20 spread on the seedbed, cover soil should be shallow, not to see the seed as degree. Third, nurturing strong seedlings using plastic greenhouse insulation seedlings, planting sheds about 1 month before sowing, in order to improve the shed temperature and ground temperature, after sowing, if the temperature is too low in the shed, can be covered in a small shed within the shed. Before the emergence of the greenhouse temperature of about 20 °C, after the emergence of appropriate temperature reduction, the daytime does not exceed 20 °C, with 15 ~ 20 °C is appropriate, at night not less than 8 °C, after the temperature rise, the seedbed should pay attention during the day ventilation Cool down, keep 15 ~ 20 °C. When the seedling grows to 2 true leaves, it begins to apply thin fertilizer, 667m2 applies urea 5~10kg, seedling density should be carried out between the seedlings, seedling spacing from 2 to 3cm square, after which according to the situation and then topdressing 2 to 3 times of thin fertilizer, each time Apply 10kg of urea per 667m2. The seedlings should always be kept moist throughout the seedling period. Pay attention to control locusts, damping-off disease. The locusts can be used to control fog, imidacloprid, and dimethoate control; cataplexy disease can be controlled by Precise, seed dressing double, and enemy cough, and the effects are good. In mid-late April, 4 to 5 true leaves of the seedlings were planted. Fourth, the rational dense planting of celery is planted in a greenhouse, and the soil in the front shed of the planting plant is to be deep-turned, with 667m2 of manure fertilizer 5000-7000kg or ternary compound fertilizer 100kg, boron fertilizer 500g, and then made into a 1.5m wide sorghum, 6m Wide sheds can be made up to 4 inches. Implant your feet when planting. People in our province like to eat smaller celery. Therefore, the planting distance should not be too large and should be planted closely. Planting spacing 15cm12cm, 667m2 planting 30000 or so is appropriate, planting should not be too deep, the soil is not buried in the growing point (Heart leaf) for the degree, after the planting, a small water pouring, keep moist. V. Field Management 1. Temperature Management When planting in mid-late April, the average temperature in our province is around 16°C, which is more suitable for the growth of celery. Before easing the seedlings, the temperature of the shed can be maintained at about 20°C. When the temperature exceeds 25°C, the awning temperature can be ventilated. After easing the seedlings, the “shed film†of the shed can be removed and replaced with a rainproof shed, which is conducive to cooling and avoiding the rain. The epidemic of disease. The temperature is relatively high in mid-May and when the sunlight is strong, the shade net is covered outside the greenhouse until harvesting is completed. 2. Fertilizer management Summer cultivating celery should be flooded with water and can not be seedlings, otherwise it is easy to suffer from drought and lack of fertilizer, affecting yield and reducing quality. Watering is usually 3 to 5 days, so that the soil in the shed is always kept moist to promote the vigorous growth of celery and reduce the ground temperature; top dressing should grasp the principle of a small number of times, usually every 10 to 15 days, every time every 667m2 Application of urea or compound fertilizer 10 ~ 15kg. Do not use human excrement, so as not to cause rotten or rot. 3. Hormone treatment Our province has high temperature from June to July, and the temperature can be reduced by 3～5°C after covering with shade net, but sometimes the temperature is still high, and it can be sprayed with 50mg/kg gibberellin for about 20 days before harvest. Secondly, it can promote the growth of celery, prevent the aging of plants, and improve the quality of celery. 4. Diseases and Insect Pest Control The summer worms, virus diseases, and spot blotch in the province are more serious. Attention should be paid to timely prevention and control. Virus disease can be controlled by virus A, disease and disease control, and spot blight can be used to kill venom and metalaxyl manganese zinc. Prevention. Sixth, harvesting began in mid-June can be divided into two or three times between the large plant listed, leaving small plants continue to grow, in mid-July, "Northern Food South" celery before the listing is completed, 667m2 output of about 3000kg.
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