First, a large amount of nitrogen fertilizer is needed. During the whole growth period of celery, a large amount of nitrogen fertilizer is needed, and top dressing is mainly ammonium bicarbonate. To do a small number of times, usually need to top-dressing 2-3 times. If the soil is deficient in boron, 0.50-0.75 kg of borax should be applied per acre to prevent the petiole from breaking and affecting the value of food. Spraying 0.2%-0.4% calcium chloride solution can prevent the occurrence of black heart disease.
Second, it is not suitable to topdress urea. Because celery topdressing urea, the growth is rather slow, the increase of cellulose, the plant is easy to aging, the quality is reduced.
Third, to apply organic fertilizer. In the field management of celery, it is necessary to chase the fully cooked chicken, duck, and other poultry organic fertilizers that have been brewed, because topdressing organic fertilizer can improve the quality of celery. However, there is no decomposed farm organic fertilizer and no top-dressing application can be made so as not to cause burned rot. After organic fertilizer was applied to celery, the growth of the celery was soft, thick, and the fibers were reduced, and the quality and yield were greatly improved. When celery grows to more than 40 centimeters, harvesting can begin.
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