【Boron deficiency symptoms】 The lack of boron in peach trees can cause the shoots to appear as "top withered" during the growth process. That is, the shoots die from top to bottom. Under the dead part, the side shoots will grow and the large branches will show turfgrass reaction. In the early stage of the disease, the skin cells are thickened, corked, and the surface of the fruit is uneven. As a consequence, the meat cells become brown and cork and become deformed.
Boron deficiency regularity Boron deficiency leads to the degeneration of meristems (including formation layers), and poor development of parenchyma and vascular tissue. Since boron cannot be stored in tree tissues, it cannot be transferred from old tissue to new tissue. Therefore, during the fruit growth, boron deficiency at any time will cause the disease. In addition to the lack of boron in soil caused by boron deficiency, other factors include: 1 thin soil layer, lack of humus and vegetation protection, easy to cause rain erosion and lack of boron; 2 soil pH at 5 to 7 when the boron is most effective , The soil is more alkaline or too much lime, boron is fixed, can not be effectively used; 3 soil is too dry, boron can not be absorbed and utilized.
[control methods] 1 soil boron. In autumn or early spring, borax or boric acid is added in combination with organic fertilizer. Boron application can be determined based on the diameter of the trunk. A tree with a diameter of 10, 20, and 30 centimeters from the ground, 30 centimeters in diameter, was applied to 100, 150, and 250 grams per plant respectively. It is usually applied every 3 to 5 years.
2 Spray boron on the tree. In strong saline alkaline soils, boron is easier to fix and spray is better. Before spraying, 1% to 2% borax aqueous solution is sprayed on branches and branches, or sprayed separately before, during and after flowering. .2% ~ 0.3% borax aqueous solution, will help improve the fruit rate.
When there is excess boron, the internodes become longer and the branches flow and burst. The main veins and lateral veins of the leaves turn yellow and fall off in severe cases.

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