Variety degradation occurs when the celery is left in the plant and crosses with other hollow celery varieties to produce a hollow phenomenon. Therefore, it must be strictly isolated from other celery varieties in order to prevent natural hybridization. Insufficient nitrogen fertilizer or improper sowing date celery suitable for multi-fertilizer cultivation, especially like nitrogen fertilizer, topdressing nitrogen fertilizer is generally based, with open-season cultivation as an example, the appropriate sowing date of celery is suitable from late May to late June, if sown Too late, together with the deficiency of nitrogen fertilizer, the plants are still small in the normal harvesting season and cannot reach the harvesting standard. Under the condition of delayed harvesting, they are vulnerable to the attack of low temperature and cold wave in the later period, the petiole becomes soft and the hollow phenomenon is aggravated. Therefore, we must choose a suitable sowing date, and strengthen the management of fertilizer and water before and during the growth, and provide sufficient nitrogen fertilizer so as to reduce the occurrence of hollow phenomena. The demand for Boron from Boron celery in soil is strong. In the absence of petiole, it is prone to cracking. Generally, 0.5 to 0.8 kg of borax per acre is used as a basal fertilizer before planting to prevent cracking of the petioles, such as the occurrence of mild cracking symptoms after planting. Mu with 0.5-0.8 kg of borax impregnated with water to root, can also inhibit the serious occurrence of cracking disease. Soil drought celery root distribution is shallow and narrow, and its drought resistance is weak. It needs sufficient soil moisture and high air humidity, especially during the prosperous period, the water is more essential. Soil drought also affects the absorption of boron by the root system, resulting in boron deficiency. Symptoms, and then the occurrence of cracked stems, therefore, in the growth process of celery, we should pay attention to the timely and uniform supply of water, to avoid the leaves small, petiole fibers, hollow phenomenon.