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Boron uptake by plants
Boron uptake by plants is controlled by the boron level in soil solution rather than the total boron content in soil. Boron uptake is a passive (non-metabolic) process. It moves with water in plant's tissues and accumulates in the leaves; therefore, Boron uptake and accumulation are directly dependent on the rate of transpiration.
Boron mobility in the phloem is now known to be plant-specie dependent.
Boron Toxicities and Deficiencies
Boron deficiency symptoms:
Limited budding, bud break, distorted shoot growth, short internodes, increased branching, flower buds falling and inhibition of fruit and seeds development
Boron toxicitysymptoms include:
Chlorotic leaftips, leaf necrosis, and later leaves falling and even plant death.