In winter, celery in greenhouses often suffers from hollowing, resulting in increased cellulose in celery, poor quality, decreased yield, and reduced commercialization of celery, which will affect the income of vegetable farmers. High temperature and drought, insufficient fertilizer, pest damage, excessive burning of roots, lack of boron, freezing of celery, late harvesting and other factors can cause hollow celery. For this reason, the following preventive measures can be taken in production:
Scientific watering In order to avoid the hollowing phenomenon of celery, we must first do a good job of water management. In the production process, vegetable farmers are often afraid that the number of watering will cause the soil temperature to drop, which will affect the normal growth of celery, resulting in insufficient water supply for the growth of celery. In fact, as long as the watering is appropriate, the normal growth of celery will not be affected. Watering is generally done every 15 days, the amount of water should not be too large, just water small. Especially in the period of vigorous growth, we must ensure sufficient water supply, and water should be sufficient 15 days before harvest.
Adjusting temperature Celery is a cold-resistant vegetable that requires cool and humid environmental conditions. Celery is grown in a shed. The temperature during the day should be 15℃～23℃, and the highest temperature should not exceed 25℃. Keep it at about 10℃ at night to reduce respiratory consumption and avoid Hollow, but not below 5°C, otherwise freezing damage and early bolting may occur. Proper ventilation at ordinary times to reduce air humidity, reduce diseases, and make petioles full and enlarged.
Reasonable fertilization On the basis of plantar fertilizer, the top topdressing in the growth period is mainly based on quick-acting nitrogen fertilizer, combined with increased potassium fertilizer, each application amount is 20-25 kg, and topdressing every 15 days. Using 0.3% to 0.5% borax solution for foliar spraying has a significant effect on preventing the occurrence of hollow heart disease.
Harvesting at the right time should not be too late. If the harvesting period is too late, the petiole will age, the leaf's ability to produce nutrients will decrease, the root absorption capacity will be weakened, and the nutrition will be insufficient, which will rupture the parenchyma in the petiole and cause hollowing.
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