The symptoms of boron deficiency are. The leaves are small and brittle, and the leaf edges are curved. The young leaves are red, and even extend to mature leaves. In severe cases, brown spots appear on the leaf edges, and they can easily fall off. The growth of new shoots is weak, the internodes are short, and the growth is stopped early. In severe cases, the shoots are extremely short, and even the shoots cannot be drawn. The tree vigor is extremely weak. The bark is rough, and the branches are yellow, dry and dull when severe. After the mature scales loose, cracking, touch down, wear dead growth point. The flowers became smaller and could not be fully opened. The flowering period was shortened and the fruit setting rate was low. In severe cases, brown spots appeared on the edges of the petals. The fruit's fruit surface is not flat, the number of stone cells is increased, the meat is thicker, some of the pulp is yellowish-brown, cork-like fruit-hearted cork disease is formed, the taste is light, and the fruit drop before harvest is serious; when the fruit is serious, the deformity is small, the fruit surface is serious. From the knot, the formation of pods or hericium, hard hard meat, loss of food value.
Boron deficiency correction method:
1. Increase organic fertilizers, improve soils, and increase the boron-bearing capacity of the soil.
2. In combination with autumn basal fertiliser, borax or boric acid is added. The amount of boron applied depends on the condition of boron deficiency in the soil and the yield. Generally, 20-30 grams of borax can be applied to each plant.
3. Spray 350-400 times borax or boric acid water for flowering and young fruit. Borax is insoluble in water and should be sprayed with clear alcohol before spraying water.
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