Celery can suffer from several physiological disorders, including heartburn, hollow petioles, petiole cracking, and boron deficiency. These conditions significantly impact the plant's growth, reducing both yield and quality. Understanding their symptoms, causes, and control methods is essential for effective management.
First, **heartburn** is a common issue in celery. It typically begins when the plant has 11 to 12 true leaves. The initial signs are brown leaf veins and necrotic, dark brown margins on the leaves. This condition often occurs under high temperatures, drought, or excessive fertilization. High temperatures increase nitrogen, potassium, and magnesium uptake, which interferes with calcium absorption, leading to calcium deficiency. Drought also weakens root systems, making it harder for plants to absorb calcium, especially in acidic soils. To manage heartburn, maintain proper temperature and humidity, apply lime to neutralize acidic soil, and use balanced fertilizers. If symptoms appear, foliar sprays of 0.5% calcium nitrate or calcium fluoride can help.
Second, **hollow petioles** are a physiological aging issue that affects the inner tissue of the petiole. The affected areas become white and spongy, with corky tissue forming. This condition often starts at the base of the petiole and spreads upward. It can be caused by sandy soil, insufficient or delayed fertilization, overwatering, or excessive gibberellin application. Soil dryness, extreme temperatures, or cold stress can also contribute. To prevent this, avoid sandy soils, ensure timely fertilization, and use 0.1% urea solution if leaf color becomes thick and yellowish.
Third, **petiole cracking** occurs when the base of the stem and petiole split. This not only reduces marketability but also increases the risk of bacterial infection and rot. It commonly happens in low-temperature, dry, or overly wet conditions, especially when the plant’s growth is stunted. Preventive measures include maintaining stable temperature and humidity, using greenhouse insulation, deep plowing, adding organic matter, and improving root health to enhance drought and cold resistance.
Lastly, **boron deficiency** leads to twisted, cracked, and brown petioles, with young leaves turning brown from the edges inward. This condition is often due to low boron levels in the soil or competition from other nutrients. High temperatures and drought can worsen the problem. To address it, apply 1 kg of borax per acre as a soil supplement, or spray a 0.1% to 0.3% borax solution on the foliage once symptoms appear.
By understanding these physiological issues and implementing proper cultural practices, growers can improve celery quality and productivity. Regular monitoring and timely interventions are key to preventing and managing these disorders effectively.
9369 Green Tea,Natural Green Tea 9369,Natural Tea Leaf Chunmee Green Tea 9367,Libya Algeria Chunmee Tea
DIYAS development Limited , https://www.diyastea.com