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"Folanx® B - the boron-calcium leaf fertilizer as a dust-free and highly water-soluble microgranulate

Nutrients and their functions: Boron (B)

Boron is present in the soil primarily in the form of boric acid (H3BO3) in the soil solution. It is transported into the plant with the flow of water. Boron is not readily available in sandy soils, or in soils with a high nitrogen or lime content or during cold, wet and dry seasons.
Boron in the soil is in great danger of being leached out on account of its high solubility. Boron, like calcium, is permanently bonded in alkaline soils.
One of the most important functions of boron in the cell structure is to promote the formation of carbohydrates that stabilize the cell walls and the crosslinking of pectin molecules in the cell wall. Boron is active as a boron complex in the plant cell, and is primarily stabilized by calcium. The two nutrients act in synergy.
Boron is particularly important for the growth of the pollen tube in the blossom. It promotes rapid growth by accelerating cell division.
Boron has an influence on the growth of cambium tissue and the terminals on stems and roots. It improves the stability and function of membranes in the cell. Boron, via the formation of phytohormones, also has a regulating effect on cell differentiation and cell expansion.
General symptoms of deficiency 
A boron deficiency is expressed in the death of terminal buds, soft and dehiscient tissue, poor blossoming and a corresponding reduction in setting fruit. Deformed fruit is typical. The leaves have yellow to red chlorotic spots and begin to die on the edges.
A boron deficiency is expressed in the vine as a disruption in the growth of the shoots and tendrils. The leaves exhibit yellow chlorotic spots, are small and curve downward on the edges. The leaves can tear and later die. The bunches have poor fruit set and extreme coulure.
Fruit farming 
In fruit trees, growth of the terminal bud is disrupted. The terminal buds die and the plant puts out auxiliary and side buds ("adventitious growth"). The shoots have uneven to hunchbacked spots, which can later split open.
The leaves are generally deformed and discolored a reddish brown. The blossoms also exhibit deformations, including on the petals, and their fertility is reduced.
The resulting fruit has bumps and deformations, a phenomenon which is particularly visible in pears. The flesh of the fruit has bitter pit-like discolored areas that dry out and form cavities.
A serious boron deficiency can result in the death of the trees.
Berry farming 
As in all other crops, the primary symptoms are leaf discoloration and deformations, followed by the death of the leaf starting at the tip. The blossoms bear fruit unevenly. The results include stunted fruit which softens quickly and is susceptible to putrefaction bacteria.