When boron is deficient, crops cannot form or form abnormal flower organs, the formation of pollen tubes is difficult, hinder fertilization, pollen grains are poorly developed, and the phenomenon of "flowers are not solid", "fruits are not fruit", "fruits are bad" and so on . Grapes "large and small fruit", "stuffed fruit", apple "shrink fruit", and fruit tree drop flowers, low fruit set rate, deformed fruit, etc., are directly or indirectly caused by boron deficiency.

Citrus: boron deficiency is susceptible to yellow leaf blight, bald branches, old leaves become thicker and more brittle, veins become thicker, and the wood becomes embolized, the skin bursts, the tree grows weak, the fruit is thin, the fruit juice sac shrinks, and the residue is juicy Less, tan gum spots on the heart, when severe, the flesh disappears, the peel thickens, shrinks, the fruit is small and hard like stone.

Chestnut: Boron-deficient growth point necrosis, lateral buds germinate, form clumps, poor pollination and fertilization or malnutrition after pollination and fertilization, resulting in embryo abortion or developmental stagnation, forming vigorous empty buds.

Grape: When boron is deficient, the leaves have yellow spots, poor shoot growth, thick internodes of the stem, poor berry development, different ear sizes, red-brown corollas often do not fall off, and there are many unfertilized seedless in the fruit bunches Small fruit, forming large and small fruit, stuffed fruit, the phenomenon of 'ancestor and grandson'.

Boron deficiency will cause the pear tree to develop poorly, deformed, uneven fruit surface, water-like necrosis area on the peel, later hardened and brown, cracks and shrinkage in the peel, scattered wood corks or stone cells, fester. Peach tree boron deficiency will occur in the brown cork area near the core of the fruit, often splitting along the suture. Symptoms of boron deficiency in fruit trees first occur and manifest at the growth point and new leaves.

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