1. Seedlings and fertilizers Celery cultivated in protected areas generally has to go through seedlings before planting. The preparation of nutrient soil can refer to the method for preparing nutrient soil of tomato, or use 1/2 of the vegetable garden soil and 1/2 of the decomposed or semi-decomposed compost according to the volume ratio to make the nutrient soil, and 2%-3 of the weight % Incorporates superphosphate. In about 30 days after emergence, topdressing with low-concentration nitrogen fertilizer as appropriate, topdressing with 0, 2 kg of ammonium sulfate or decomposed thin human feces per border.
2. Base fertilizer Since celery has a shallow root system and high cultivation density, it is necessary to apply foot base fertilizer when preparing the ground before planting. Apply 4000-5000 kg organic fertilizer and 30-35 kg superphosphate per mu. 25-20 kilograms of potassium sulfate, for boron-deficient soil, 1-2 kilograms of borax per mu can be applied.
3. Topdressing fertilizer is generally produced during the slow seedling period after planting. Plant growth is very slow during slow seedling. In order to promote the growth of new roots and leaves, the seedling fertilizer can be applied once, 10 kg of ammonium sulfate per mu with water, or decomposed 500-600 kg of human feces and urine. From most of the new leaves on display until the plant enters the vigorous growth period before harvest, the leaf area expands rapidly, the petiole rapidly elongates, the parenchyma in the petiole hyperplasia, celery absorbs a large amount of fertilizer, and the rate of fertilizer absorption is fast, so it is necessary to add fertilizer in time. For the first time, 7-9 kg of urea or 15-20 kg of ammonium sulfate and 10-15 kg of potassium sulfate were applied per mu for the first time. Half a month after the first top dressing, celery enters the vigorous growth period, with small white roots all over the ground, the leaves are bright green and shiny, and there are some bulges on the leaf surface. At this time, the second top dressing is performed with the same amount as the first. After another 15 days or so, perform the third top dressing. The amount of fertilizer is the same as the first one, or the amount of fertilizer may be increased or decreased depending on the growth of celery.
Nitrogen and potassium fertilizers should not be applied too much each time. Excessive concentrations of nitrogen and potassium in the soil will affect the absorption of boron and calcium, causing the young tissues of the celery core leaves to brown and dry edges. In severe cases, it will die. It is more serious when the soil is dry and the ground temperature is low. Therefore, it is necessary to control the amount of nitrogen and potassium fertilizers, increase the application of boron and calcium fertilizers, keep the soil moist, and avoid low soil temperature. When the plant is lacking in boron, it is easy to produce stem cracks, which mostly appear on the inner side of the outer leaf petiole. During the development of the heart leaf, there is a lack of boron, and its inner tissue turns brown and cracks occur.
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