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Boron is the most widely deficient minor nutrient in vegetable crop soils. It is needed for protein synthesis and increases flower set, crop yield and quality. In combination with adequate phosphorus, boron increases pollination, fruit set and seed development.

Boron deficiency causes growth reduction at the growing tips. Plants have small, crinkled, deformed leaves with large areas of discoloration. Boron deficiency is often caused by application of too much lime. While boron is essential for root growth and fruit development, it can become toxic if over-applied. Always test the soil and apply only the recommended amount.

The deformed fruit of these strawberries is due to a deficiency of boron, which also deforms the plants leaves and roots.


Bushy, drooping, crinkled leaves indicate boron deficiency in potato plants.

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