For every 1,000 kilograms of celery produced in the protected area, 0.4 kg of pure nitrogen, 0.32 kg of phosphorus, and 0.77 kg of potassium need to be absorbed. The absorption ratio of nitrogen, phosphorus, and potassium is 1.25:1:2.41.
Fertilizer nutrient soil can be prepared by mixing 1/2 of the vegetable garden soil with 1/2 of the composted or semi-rotting compost and doing the nutrient soil according to the volume ratio, and mixing the superphosphate with 2% to 3% of the weight. In the 30 days after emergence, there was a low-concentration nitrogen fertilizer, and 0.2 kg of ammonium sulfate or decomposed dilute human excreta was applied to each loquat.
Due to the shallow root system of celery and the high density of cultivation, basal must be applied to the base fertilizer before planting. Apply 4,000 to 5,000 kilograms of organic fertilizer and 30 to 35 kilograms of superphosphate per acre. 20 ~ 25 kg of potassium sulfate, for boron-deficient soil can be applied to 1 ~ 2 kg of borax per acre.
The seedlings are generally topdressed during the seedling period after planting. When the seedlings are slowed, the growth of the seedlings is very slow. To promote the growth of new roots and leaves, the seedlings may be applied once, and 10 kg of ammonium sulfate may be applied per acre with water, or cooked. Human excrement 500 to 600 kg.
The top-dressing top-dressing plants were exhibited from the new leaves to the vigorous growth period before harvest. The leaf area expanded rapidly, the petiole rapidly expanded, and the parenchyma parenchyma was hyperplastic. The celery had a large amount of fertilizer and the rate of fertilizer absorption was fast. For the first time, 7 to 9 kg of urea or 15 to 20 kg of ammonium sulfate and 10 to 15 kg of potassium sulfate are applied per acre. After the first half of fattening, celery entered a vigorous growth period. Small white roots covered the ground, and the leaves were bright green and shiny. There were some bulges on the leaves. At this time, the second topdressing was performed with the same amount as the first time. The third topdressing will be carried out in about 15 days. The amount of fertilizer will be the same as the first time, or the amount of fertilizer will be increased or decreased depending on the growth of celery.
Clever application of fertilizer nitrogen and potassium fertilizer should not be too much for each application, high soil nitrogen, potassium concentration will affect the absorption of boron, calcium, resulting in the young tissue of the heart of celery leaves brown, and dry edges, severe death. In the absence of boron in the plant is also easy to produce stem cracks, stem cracks appear more in the outer leaf petioles. The lack of boron during the development of the heart leaves, the inside of the organization becomes brown, and the phenomenon of cracking occurs. Foliar application of 0.5% borax aqueous solution to a certain extent to avoid the occurrence of stem cracks.
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