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Category - Plant Nutrition
Boron in Plants
Boron is one of the seven micronutrients required for normal growth of plants.
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:
Symptoms of boron deficiency in pepper
Boron toxicity symptoms include:
Chloritic leaf tips, leaf necrosis, and later leaves falling and even plant death.
Boron in the soil
Boron is soils can be categorized into 3 groups:
The ratio between the Boron concentration in the soil solution and the Boron adsorbed to soil particles is affected by the components of the soil (clay minerals, free oxides and organic matter) and also by other factors such as type and concentration of salts in the soil, pH and temperature.
Actually, most of the boron in soil is adsorbed to organic matter, acting as a pool of boron from which the boron can be readily released into the soil solution.
Preventing boron from accumulating in the root zone
Since toxic levels of Boron are only slightly higher than deficiency levels, it is important to keep a non-toxic level of Boron in soil solution. In order to achieve that, root zone should be flushed either periodically or continuously.
The water amount and the irrigation intervals should be determined in the same way done for treating salinity buildup in soil.
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