What are the symptoms of boron deficiency in fruit trees? How to treat? For fruit farmers, fertilization is very important. If not done well, it will lead to many symptoms and a significant drop in fruit quality.
Nutritional deficiency symptoms
Boron deficiency generally lacks boron in early spring. Initially, flower buds and leaf buds were delayed and germinated, and then they died and the branches returned. By identifying the bark formation layer, it can be concluded that the boron-deficient shoots die and the overwintering shoots die, the formation layer caused by boron deficiency is white, and the latter layer becomes brown.
The boron deficiency of apple trees presents rounded leaflets at the top of the new shoots, and these rounded leaflets sometimes form clumps. With the increase of boron deficiency, the leaves are getting smaller from bottom to top, and some varieties have trunk and bark necrosis. When the pear tree is deficient in boron, it forms a top bud very early, stops growing, and has no symptoms of round lobular lobes. The most common flowers are wilted when they are not open, and some of the short branches of the flower buds are still normal, but gradually wither after flowering.
The leaves of zinc-deficient fruit trees that are deficient in zinc are often referred to as "lobular disease" or "cluster disease." The new shoots are severely shortened, causing the leaves to be clustered, called "clusters". In the case of "small leaf", the leaf spacing is normal, but the leaves become smaller, sometimes the whole tree shoots occur, sometimes in the local.
The obvious symptoms of zinc deficiency are dead leaves. In the early spring, the lobes of the shoots at the top of the new shoots have spotted flowers. The other parts of the new shoots are likely to have no leaves, which are like light branches. Later, the new shoots appear in the lower part of the affected branches, and the leaves grow normally. It gradually becomes narrower and longer, and also has spotted flowers. In the first year of the injury, there may be dry shoots, less flower buds, small fruit, and deformity.
Method for applying boron and zinc
After the diagnosis of fruit trees is deficient in boron and zinc deficiency, the method of applying ditch and acupoints is applied once a year. In the spring fertilization, 50 grams of boron fertilizer and zinc fertilizer are applied to each adult tree. Firstly, an annular semicircular groove with a depth of 30 cm is dug outside the canopy, and the boron fertilizer and the zinc fertilizer and the organic matter are simultaneously applied in the ditch, and water is applied after the application, and the soil is dried after the water is dried.
In the growth period of fruit trees, boron and zinc are found to be fertilized at any time. For each 1 to 2 years, 25 g of boron and zinc fertilizer are applied to each fruit tree. After 2 years of application, it will stop for 1 year. After normal growth, it will not be fertilized. In the flowering period of fruit trees, when the flowers are opened at 50%, the water is sprayed on the flowers and leaves with 0.5% boron fertilizer, which can improve the quality yield of the fruit trees.
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