How to cultivate strong seedlings of autumn celery

Variety selection: In early autumn, the temperature is high. It is advisable to choose heat-resistant, fast-growing early or mid-early varieties, such as green celery, Jinnan celery, glass crisp celery, Zhengda yellow celery, Italian celery, etc.

Seedbed preparation: Choose cool and avoid the sun and use it as the "mature soil" for spring cucumbers or fast-growing leafy vegetables. Each 10 square meter seedbed can be used for 100 square meters field planting.

15 days before planting, deep turn the soil 33 cm deep, bake it, whiten it, level it, combine with soil preparation, apply 5000 kg of high-quality soil manure or decomposed animal manure per mu of seedbed, and spread 200-250 kg of lime. Prepare medicated soil, use 10 grams of 50% carbendazim or 50% thiophanate powder or 3000 times solution of 95% hymexazol per square meter of seedbed, mix the pesticide with 15 kilograms of fine soil, and take 1/3 of the medicinal soil. Clay the soil, and then use the remaining 2/3 of the medicine soil as mulch soil after sowing to prevent soil-borne diseases from occurring.

Seed treatment: when sowing, if the weather is cool, it can be broadcast live, if the temperature is higher, it needs to be soaked in low temperature to accelerate germination. The method is to soak it in clean water for 24 hours and then pick it up, then wash it with clean water, rub it with your hands, wrap it with gauze, and place it in the freezer of the refrigerator to germinate. Note that it must be rinsed once a day. After about 7 days, the seeds will become white. Sowing can be done when 50% of the seeds become white. 5 mg/kg gibberellin can also be used to soak seeds to break dormancy and promote germination.

Sowing: Before sowing, the bed soil should be drenched thoroughly. After shrinking, use a hoe to loosen the topsoil and sow in the evening. Sow 100-150 grams of seeds per 0.1 mu of seedbed. In order to sow evenly during sowing, the seeds can be mixed into equal volume of fine sand or dry soil, and sowed in batches. First broadcast a little thinner, and then re-spread evenly. Then cover the nutrient soil with a thickness of 3 to 4 mm (about a flat finger). Because the top soil strength of the seeds is weak, the soil cannot be too thick, and a layer of mulching film is applied after sowing.

Strengthen management: First, immediately cover the small arch shed or flat shed with sunshade nets after sowing, so as to cover day and night. After sowing, cover with a double-layer black shade net until the seedlings emerge, and then change to a single-layer black shade net. Cover the net for 2 to 3 hours before and after noon on a sunny day, and uncover the rest of the time. This will not only help shade and cool down, promote early emergence, increase the emergence rate, but also moisturize and reduce watering. Second, after sowing, it is necessary to water frequently with small water to keep the border surface moist. When the seedlings have 1 to 2 true leaves, a layer of fine soil should be sprinkled on the border surface after watering to cover the roots of the exposed seedlings. Water should be carried out in the morning and evening (high temperature season). Spray with 70% chlorothalonil 600 times solution to prevent damping-off in the seedling stage. Topdressing 2 to 3 times in the seedling stage, mainly with urea to extract seedlings, or 10% to 20% of light manure water. Start thinning of 2 true leaves once. Apply 10-15 kg of ammonium sulfate or urea per mu a week before transplanting.

Proper cultivation of seedlings: The age of autumn celery seedlings is generally 50 to 60 days, and the seedlings should be refined 6 to 7 days before planting. Gradually remove the shading net, stop watering, squat the seedlings to promote roots to prevent excessive growth. The standard for strong seedlings of celery is: the height of the plant is 10 to 15 cm, the true leaves are 4 to 5, the leaves are thick, the leaves are dark green, and the root system is developed. Watering the day before planting is conducive to seedlings and transplanting with soil.

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