Fruit trees are perennial woody crops. When the main nutrients such as nitrogen, phosphorus, potassium, magnesium, calcium, sulfur, and boron are all available, fruit tree yield and quality are optimal. When an important element is lacking, its yield and quality will be affected. Great loss. Excessive cultivation and management of some fruit planting areas, or partial application of nitrogen, phosphorus, and potassium fertilizers, lead to imbalances in the proportion of nutrients needed for growth, and the lack of trace elements is increasingly becoming an important limiting factor affecting fruit tree growth, yield, and quality. If the fruit tree in your home is not growing well, please check if it is related to boron deficiency. The boron deficiency diagnosis in Hubei Province is generally low. The content of available boron in soil is less than 0.5ppm (above 0.20%, the soil with serious boron deficiency is less than 0.2ppm, accounting for 30%), and the fruit tree is effective boron in the soil. The general requirement is 0.8ppm or more. The following are the symptoms of boron deficiency in several fruit trees: Citrus mandarin orange: Boron deficiency is susceptible to yellow leaf blight, tipped shoots, old leaves become thicker and brittle, veins thicker, corky, skin burst, tree vigor, fruit set Diluted, the juice sac in the fruit shrinks, the slag is less juicy, and the tan is brown, and the flesh disappears when the skin is thick. The skin is thickened, shrinking, and the fruit is small and hard as stone. Chestnut: Necrosis of boron-deficient growth points, sprouting of lateral buds, formation of arbuscular branches, poor pollination and fertilization, or malnutrition after pollination and fertilization, resulting in embryo abortion or developmental stagnation, resulting in an impractical empty spot. Grapes: In the absence of boron, the leaves have pale yellow spots, poor growth of shoots, coarse internodes of stalks, poor berry development, different sizes of ears, and often detached red-brown corollas. There are many unfertilized seedless kernels in fruit bunches. Small fruit, forming the size of the fruit, filling the fruit, the phenomenon of "grandson and grandson together." Pear trees: Boron deficiency can lead to poor fruit development, malformation, uneven fruit surfaces, and watery, spotted areas of necrosis on the pericarp. Afterwards, it becomes hard brown, cracks occur in the pericarp, shrinkage, and scattered cork in the pulp. Stone cells, ulcerated. Peach: In the absence of boron, brown pegs occur near the nucleus of the fruit and often break along the suture. The symptoms of boron deficiency in fruit trees occur first and are reflected in the growth point and new leaves. If you are sure that your own fruit tree lacks boron, don’t be afraid. The following methods can be used for treatment: 1. Basis: 200-250 grams of boron per acre or 5-10 grams of boron per tree (quantitative according to the size of the crown), It can also be combined with compound fertilizer and organic fertilizer together. The time of application is generally after fruit harvesting. The width of the ditch with a width of 25 cm and a depth of 20 cm should be excavated along the dripping line of the crown of the fruit tree. Holding boron can also be applied as a strong fruit fertilizer in the same way. 2, foliar spray fertilizer: foliar spray speed music boron, crops absorb quickly, the effect is good, the application is also very convenient, is an important method of boron application. In the new leaf fruit period (special reminder: for the fruit tree after the first flowering leaves, such as pears, peaches, etc., to be sprayed after the new leaves grow into, so as not to damage the flowers and young leaves, buds), early flowering and fruit set Application, spraying 2-3 times throughout the growing season is appropriate. The concentration of spraying boron is 0.1-0.2%, the amount of spraying is uniform and the foliage is wet, and the rain is sprayed within 4 hours after spraying, and the spray should be repeated. Sonic boron can be mixed with pesticides and other foliar fertilizers, making it more convenient and time-saving to use. (Provincial Agricultural Science Institute of Plant Protection and Soil Fertility Ma Chaohong)
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