How should celery be fattened?

How should celery be fattened? Is there any method that can be carried out according to the following methods: appropriate application of more nitrogen fertilizer celery needs a large amount of nitrogen fertilizer during the whole growth period, topdressing should be mainly ammonium bicarbonate, do a small number of times, generally need to topdressing 2 times 3 times. However, it should be noted that celery should not be topdressing urea, because after topdressing urea, celery growth slows down, cellulose increases, the plant is easy to age, the quality decreases, and it has a bitter taste when eating, so celery should not be topdressing urea during the whole growth period. Topdressing organic fertilizer after retting and fully ripening organic fertilizer can improve the quality of celery. Note that non-mature organic fertilizer should not be used as topdressing, so as not to cause rotting roots. After the application of organic fertilizer, the stem was tender and sturdy, the fiber was reduced, and the quality and yield were greatly improved. Calcium deficiency of micro-fertilizer will cause heartburn of celery, while boron deficiency will cause physiological diseases such as hollow celery, petiole cracking and so on. Spraying 0.5% calcium chloride or calcium nitrate solution on the leaf can prevent celery from "heartburn"; in order to prevent celery hollow and petiole cracking, 0.5-0.75 kg borax per mu can be applied, or 0.3%-0.5% borax solution can be foliar sprayed. More celery planting techniques