Boron is one of the most widely used trace elements in agricultural production in the world today. The main reason for the lack of boron in vegetables is that most crops have a high demand for boron, such as rape, celery, sugar beet, spinach, radish and other crops are highly sensitive to boron, and another reason is that boron and nitrate are as easy to rinse, In vegetable cultivation, especially in facility cultivation, the amount of irrigation is too large and soil soluble boron is easily lost. To solve the problem of boron deficiency in vegetables, the application of boron fertilizer is carried out. Before the sowing of the crops or the preparation of transplants, 3 kg of granular sodium borate pentahydrate is applied per hectare. Boron can also be added in the form of foliar spray, which is characterized by its effectiveness, economy, and safety. Since boron is the main transportation route in most vegetables is xylem, this type of vegetables should be sprayed during the period when the amount of boron is highest. The most effective spraying period is: Solanaceous vegetables are sprayed in the post-emergence and early flowering period. ~3 times; root vegetables are sprayed twice in the post-emergence period to the root growth period; cabbage vegetables are sprayed 2~3 times in the post-emergence, rosette, and early ball stage; leafy vegetables are sprayed during the post-emergence to the growing season. Shi 2 ~ 3 times. When the symptoms of boron deficiency occur in the field, they should be sprayed 2 or 3 times as quickly as possible, each time between 5 and 7 days. Leaf spray recommended the use of water-soluble and high content of sodium octaborate salt or potassium octoborate, spray concentration of 800 to 1000 times. The concentration of crops at seedling stage can be reduced as appropriate, slightly higher in the late growth period, and boron poisoning should not be caused by exceeding the application concentration, resulting in loss of green leaves and flowers and leaves.
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