Excessive application of borax or boric acid can lead to boron toxicity in citrus trees, including pomelo and red wine honey grapefruit. If more than 22 units of borax are applied per tree on the soil surface, symptoms of boron poisoning will appear after some time. This condition can severely affect tree health and fruit production.
To address boron poisoning in grapefruit trees, practical experiments have shown that applying 1-1.5 liters of lime around the base of each tree can effectively neutralize the excess boron. However, it's important not to overapply lime, as this may lead to boron deficiency instead. The treatment helps restore tree vitality, but long-term management is essential for full recovery.
Symptoms of boron toxicity in pomelo trees include yellowing of new shoots, which may eventually fall off. After proper treatment, it’s crucial to strengthen overall tree care by improving fertilization and irrigation practices. By the second and third years, the tree's growth, flowering, and fruiting typically return to normal levels.
To prevent boron toxicity, it's best to avoid applying borax directly to the soil. Instead, foliar sprays of 0.1% boric acid or 0.2% borax are recommended. These should be applied carefully during specific growth stages, such as at the flower bud stage and before flowering, as well as during the early fruit-setting period when new shoots are developing.
Long-term experimentation has shown that frequent spraying of borax outside these critical periods can lead to excessive boron accumulation. This can weaken the tree, cause premature leaf drop during winter and spring, reduce flowering the following season, and lower fruit set. Additionally, if other nutrient deficiencies, like magnesium, are present, they can further weaken the tree’s overall health and productivity.
Proper timing, dosage, and application methods are key to maintaining a healthy balance of nutrients and avoiding toxic effects. Always monitor tree response and adjust accordingly for optimal results.
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