Technical specification for pollution-free fertilization of celery

(1) Cultivate strong seedlings: The celery seedlings have a long age, and it is necessary to cultivate high-yield, high-quality, disease-resistant, stress-resistant, adaptable, and good-quality celery varieties, such as sticks. Celery, Beijing fine skin white, new Thai celery, solid stalk, parsley (celery), winter celery, summer celery, glass crisp and so on. Refusal to use genetically modified varieties. The nursery site should be isolated from the production field, and centralized nursery or factory seedlings should be implemented. Nutritional preparation: Mix the garden soil that has not been planted with celery in 3 years with high-quality decomposed organic fertilizer, the ratio is 3~5:5~7, and the appropriate amount of ternary compound fertilizer. The nursery bed soil is mixed with 50% carbendazim wettable powder and 50% thiram wettable powder by 1:1, or with 25% metalaxyl WP and 70% mancozeb wettable powder by 9:1. Mix and disinfect, mix 8-10 grams per square meter with 15-30 kilograms of fine soil, take 1/3 on the surface, and cover the remaining 2/3 of the soil on the seeds after sowing. The seedbed soil is moisturized, and the seedlings and seedlings are timely adjusted to control the seedlings. When the seedlings are 2 to 3 true leaves, a small amount of chemical fertilizer is applied to promote the growth of the seedlings. Seedling age 50 to 60 days, 5 to 6 true leaves can be colonized. (2) Re-application of base fertilizer, timely planting: apply high-quality decomposed organic fertilizer 60,000 to 75,000 kg per hectare, 450-600 kg of nitrogen, phosphorus and potassium compound fertilizer, and 7.5 to 15 kg of borax at the bottom of boron-deficient land. After fertilization, plow 20 to 30 cm. Protected cultivation, disinfection of sunlight in the first month before planting or disinfection and sterilization with other bactericidal insecticides to control nematodes. 3,750 grams of 45% chlorothalonil smog per hectare, ignited in 4 to 5 places and then sterilized in a closed shed. Ventilation before planting. Celery is suitable for "shallow no roots, no deep heart". Pour enough water after planting. (3) Skillful application of top dressing: After applying the base fertilizer before planting, in order to promote the slow seedling growth and rapid growth of celery, quick-acting nitrogen fertilizer should be applied at the time of planting or slow seedling, and the ammonium sulfate should be applied 225-300 kg/ha. After the end of the seedlings, the topdressing is carried out once every 10 days, combined with watering, and the water is used for the fertilization method, each time using 15,000 kg/ha of decomposed human excrement or 225-300 kg/ha of quick-acting organic-inorganic compound fertilizer. Topdressing 2 to 3 times, stop fertilizing 15 to 20 days before harvest. It is not advisable to apply organic fertilizers such as human excrement in the cultivation of celery in summer to avoid causing rotten roots. Remove the lateral buds in time, remove the diseased plants, remove the pests and leaves, and take them out of the field for deep burial or burning. It can be harvested 50 to 60 days after planting.

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