Variety degradation. When the celery is left, it is hollowed with other hollow celery varieties, so it must be strictly isolated from other celery varieties when the seedlings are preserved to prevent natural hybridization.
Nitrogen fertilizer is too little or improper sowing date. Celery suitable for multi-fertilizer cultivation, especially like nitrogen fertilizer, topdressing nitrogen fertilizer in general, with open-season cultivation, for example, the appropriate sowing date for celery from late May to late June is appropriate, if sowing too late, coupled with nitrogen deficiency In the normal harvest season, the plants are still small and cannot reach the harvesting standard. In the case of delayed harvesting, they are vulnerable to the attack of low temperature and cold waves in the later period. The petiole becomes soft and the hollow phenomenon is aggravated. Therefore, the appropriate sowing date must be selected. , And to strengthen the management of fertilizer and water before and during the growth, and provide sufficient nitrogen fertilizer, can reduce the occurrence of hollow phenomenon.
The soil lacks boron. The demand of boron for celery is strong. In the absence of petiole, it is prone to cracking. Generally, 0.5-0.8 kg of borax is applied per acre before basal establishment as a base fertilizer to prevent cracking of the petiole. If mild cracking occurs after planting, the water per acre will decrease. The application of 0.5-0.8 kg borax to root can also inhibit the severe occurrence of cracking disease.
Drought in the soil. The root distribution of celery is shallow and narrow, and the drought resistance is weak. It needs sufficient soil moisture and high air humidity, especially during the prosperous period, the water is even more essential. The soil drought also affects the absorption of boron in the roots, resulting in symptoms of boron deficiency. 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 small leaves, petiole fibers, hollow phenomenon.
Automatic Cable Reel,Automatic Water Hose Reel,Industrial Water Hose Reel,Automatic Garden Hose Reel
NINGBO QIKAI ENVIRONMENTAL TECHNOLOGY CO.,LTD , https://www.hosereelqikai.com