Rubber

{Hevea brasiliensis}

Boron deficiency in rubber trees

Boron deficiency in rubber trees would be expected only in soils of extremely low boron status as the rubber tree is efficient in absorbing boron. It is particularly sensitive to excess boron supply.

Boron-deficient leaves are distorted, reduced in size, and somewhat brittle. The leaf deformation does not follow any consistent pattern and there is no loss of color. On young unbranched trees, the first sign of boron deficiency is found in the younger, upper stories of leaves on the plant, which will not be separated by any discrete internode. The individual stories cannot be distinguished, resulting in the “bottle brush” appearance of the stem. When boron deficiency is severe, the apical meristem may die and axillary meristems develop prematurely.

U.S. Borax, part of Rio Tinto, is a global leader in the supply and science of borates—naturally-occurring minerals containing boron and other elements. We are 1,000 people serving 650 customers with more than 1,800 delivery locations globally. We supply around 30% of the world’s need for refined borates from our world-class mine in Boron, California, about 100 miles northeast of Los Angeles. Learn more about Rio Tinto.

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