When the celery seedlings grow to 10 cm in height and 7-8 true leaves, they can be planted. First, colonization Before planting, 6,000 kg of high-quality organic fertilizer and 50 kg of diammonium phosphate were planted in the protected area, and 1.3 metre wide flat ridges were planted in a row with a spacing of 25 cm and a spacing of 20 cm. The seedlings were irrigated the day before planting. Planting time is best selected on cloudy days or late afternoons. The strong seedlings are planted with earthworms, watered on the side of the planting seedlings, put on the greenhouse film in time, and the ventilation in the greenhouse is taken care of to guard against roasting seedlings. Second, management measures After the planting, in the event of a violent storm, the weather should be shaded 2-3 days in a timely manner. After planting, the seedlings should be kept in a gentle condition and watered 2-3 times. After moderate seedlings, appropriate seedlings are planted in deep tillage. When the minimum temperature dropped to 5°C, attention should be paid to the insulation at night, and the air should be cooled and humidified during the day to prevent leggy and disease. The daytime temperature should be maintained at 20°C-25°C and 10°C at night. In mid-November, straw curtain insulation should be stamped, and the air release should be kept for more than 2 hours every day. During cloudy days, it is also necessary to pay attention to air release and dehumidification, and the air release time should be shortened. When the plant grows to 25-30 centimeters, it can be fertilized once, and 20 mus of urea can be watered immediately. After the plant enters into a vigorous growth period, it is imperative that there is no shortage of water. After 7-10 days, a water is poured and the water is topdressed once. The watering is generally selected in the sunny morning. At the same time warming up the greenhouse seal, the ground temperature can quickly rise, let off at noon to eliminate moisture. The lack of water, nitrogen deficiency or low temperature during the vigorous growth of celery can lead to hollow stems. Borax deficiency prone to schizophrenia, calcium deficiency can occur black heart disease and so on. Therefore, it should be timely watering fertilizer, insulation, and more organic fertilizer to ensure the supply of trace elements, the middle and late growth can be spraying potassium dihydrogen phosphate solution or urea water. Third, pest control Leaf spot and spot blight can be sprayed with 75% chlorothalonil wettable powder 600 times, and can be controlled with chlorothalonil aerosol on cloudy days. Gray mold can be used carbendazim or mancozeb 800 times liquid control, aphids can be used to wipe fog 1000 times liquid or 2.5% deltamethrin EC 2000 times liquid control. Fourth, timely harvest When the plant grows to standard height, it can be harvested. The harvest period is from late December to early February. The growth period should not be too long. If it is too long, hollowness will occur and the quality will decline. Pesticide And Fertilizer Raw Materials We are a specialized manufacturers of Pesticide And Fertilizer Raw Materials from China; We support Pesticide Raw Materials, Derris Root Powder, Pyrethrum Extract, Amino Acid Powder, Abscisic Acid and so on. With advanced R & D and manufacturing in Pesticide And Fertilizer Raw Materials. With high-quality products of Pesticide And Fertilizer Raw Material, we can be a trust suppliers / factory. As a wholesale of Pesticide And Fertilizer Raw Materials, we have the perfect after-sales service and technical support. Look forward to your cooperation! Pesticide Raw Materials,Derris Root Powder,Pyrethrum Extract,Amino Acid Powder,Abscisic Acid Xi'an Quanao Biotech Co., Ltd. , https://www.quanaobiotech.com