Acidic red soils in the south are boron-deficient areas, including red soil, red brick, red soil, yellow soil, purple soil and calcareous soil. There is also a large area of ​​boron deficiency in the soil developed in the northern loess area. Calcareous soils containing free calcium carbonate and poorly drained meadow soils are also prone to boron deficiency. The critical value of soil available boron deficiency is less than 0.25 mg/kg. The boron sensitive crops are mainly leguminous and cruciferous crops (such as rapeseed, peanut, soybean, etc.), followed by sugar beets, fruit trees, sugar cane, vegetables, and cotton. crop. Cereal crops such as rice, wheat, and corn are less sensitive to boron. Application of boron fertilizer has obvious effects on the prevention and treatment of cotton buds without flowers, rape rape without flowers, and fruit trees with falling and falling fruit. Boron fertilizer has an effect on the flowering results of crops, accelerating carbohydrate transport in the body, enhancing photosynthesis, and forming nodules in legumes. It can improve the drought resistance and cold resistance of crops and help prevent crops from physiological diseases.
Boron fertilizers are borax and boric acid, and borax is commonly used. The fertilization method is mainly foliar spray. With 0.1%-0.2% of borax or boric acid solution, spraying about 50 kg per acre, spraying 2 or 3 times, rapeseed spraying in late seedling stage, convulsing period, early flowering period. Fruit trees are sprayed during the flowering period and young fruit period. It should be noted that crops require adequate and excessive amounts of boron, resulting in a very narrow range of poisoning. And the effect of boron is post-effect. It is necessary to strictly control the dosage. Evenly applied, a fertilizer effect can last 3 to 5 years to prevent excessive application of poisoning.
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