Symptoms and prevention of boron deficiency in Celery
Celery plants showing signs of distress often begin with the new leaves, which appear burned and deformed. Chlorosis between the veins becomes noticeable, along with small, bumpy growths on the stems. As the condition progresses, the leaves become thick, brittle, and prone to cracking, while the inner heart of the plant starts to burn. In protected environments like greenhouses, the heart leaves may develop a wet rot, and the growing tip can die off entirely. When the plants are pulled up, the roots are short, underdeveloped, and show signs of browning at the tips. Unfortunately, various bactericidal agents have proven ineffective in treating this issue.
After expert diagnosis, it was identified that the problem stemmed from a severe boron deficiency. Once boron fertilizer was applied, the symptoms showed significant improvement. To prevent such issues in the future, several effective methods have been recommended.
Celery is particularly sensitive to boron, so it's crucial to apply it correctly. There are two main application methods: as a base fertilizer or through foliar spraying. Both approaches can help prevent boron deficiency effectively.
When using boron as a base fertilizer, it's recommended to apply 0.3 to 0.5 kg per acre, either mixed directly into the soil or blended with organic compost or NPK fertilizer. However, care must be taken to avoid direct contact with seeds or young seedlings, as this could lead to root rot or seedling death.
For foliar spraying, if symptoms of boron deficiency are observed in the field, it’s important to act quickly. A 0.1% solution of boron fertilizer should be sprayed onto the leaves, using approximately 40 kg per mu (about 667 square meters). The spraying should be done once every 5–7 days, with a total of three applications. It’s best to spray in the late afternoon when the leaves are wet but not dripping, ensuring maximum absorption.
By following these preventive measures, farmers can significantly reduce the risk of boron deficiency in their celery crops, leading to healthier plants and better yields.
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