The fertilization technology of celery

1. Seedlings and fertilizers Celery cultivated in protected areas generally undergoes seedling cultivation and then planting. The preparation of the nutrient soil can refer to the method of preparing the 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 press 2%-3 of the weight. % Incorporates superphosphate. After 30 days after emergence, apply a low-concentration nitrogen fertilizer as appropriate, and apply 0, 2 kg of ammonium sulfate or decomposed thin human feces per border.

2. Base fertilizer Since celery has a shallow root system and a high cultivation density, it is necessary to apply foot 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, 1-2 kilograms of borax per mu can be applied to boron-deficient soil.

3. Topdressing fertilizer is generally produced during the slow seedling period after planting. When the seedling is slowed down, the plant growth is very slow. In order to promote the growth of new roots and leaves, the seedling fertilizer can be applied once, and 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 quickly elongates, and the parenchyma in the petiole proliferates. Celery has a large amount of fertilizer and a fast rate of fertilizer absorption. It is necessary to apply 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, the celery enters the vigorous growth period, the fine white roots are 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 carried out with the same dosage 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 heart leaves to brown and dry edges. In severe cases, they 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 fertilizer and potassium fertilizer, increase the application of boron fertilizer and calcium fertilizer, keep the soil moist, and avoid the soil temperature from being too low. When plants are lacking in boron, they are also prone to stem cracks, and stem cracks 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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