The soil in Anhui Province is generally deficient in boron. The lack of boron will not only result in the normal growth of boron-sensitive crops, but will also reduce its resistance to stress and deteriorate quality. One of rape's more sensitive varieties of boron. The province has planted about 17 million mu of rapeseed all year round. Without the application of boron fertilizer, it can cause a reduction in production. The use of poor boron fertilizer in lands with severe boron deficiency will result in serious reduction of production. In addition, during the growing period of rapeseed, a special climate is encountered, such as prolonged droughts and locust plagues. Even if a boron fertilizer plot is used, because boron can not normally absorb boron from the soil, boron deficiency may also occur. First, the choice of boron fertilizer boron fertilizer refers to the boron element (B) elements of trace element fertilizer, can promote normal crop growth. The common boron fertilizers on the market are mainly the following: 1. Borax: The chemical name is sodium tetraborate decahydrate (Na2B4O710H2O) is an industrial raw material, the national standard first-class product content (Na2B4O710H2O) is 95%, equivalent The content of elemental boron (B) is 11%, the appearance of white fine crystals, slightly soluble in cold water. As a basic application of boron fertilizer on rapeseed crops after the toxic effects of rice; as foliar fertilizer, the need to use hot water before melting can be used, inconvenient to use, and the use of boron fertilizer is low. 2. Synergistic boron fertilizer: Synergistic boron fertilizer is a new type of trace element fertilizer suitable for plant absorption researched and developed by the Anhui Province Soil and Fertilizer Station. Its main component is sodium tetraborate (Na2B8O134H2O), also called instant boron. Rapidly soluble in cold water, the content of elemental boron (B) is 21%, which is nearly double that of boron (B) of borax (Na2B4O710H2O). The synergistic boron fertilizers prepared by using sodium tetraborate sodium (Na2B8O134H2O) as the main raw materials mainly include: (1) gold ground to quickly dissolve boron fertilizer, and the content of elemental boron (B) is 20.5%, 15%, and 12%. 2 varieties, (2), gold liquid to boron: the content of elemental boron (B) is 140g/L. The synergistic boron fertilizer can be dissolved in cold water at normal temperature, which is convenient for application and beneficial to crop absorption. The utilization rate of boron fertilizer is high, the effect of increasing production is good, and there is no pollution to the environment. 3. Boron-Magnesium Fertilizer: Some are called Sulfur-based Boron Fertilizer. It is a by-product of industrial production of boric acid and borax. The main component is magnesium sulfate (MgSO.7HO), the content is about 95%, and the content of elemental boron (B) is only 0.5. About %, the appearance of white crystals, soluble in cold water. 4. Others: In recent years, there have been many kinds of small-package boron fertilizers on the market. Such boron fertilizers are unregistered or counterfeit registered products, such as refined magnesium boron fertilizer, multi-element boron fertilizer, compound boron fertilizer, agricultural boron fertilizer, and agricultural borax. Etc., the content of boron (B) is not marked on the packaging, only the content or content of industrial products is marked. In general, the content of boron in such products is very low. There are also liquid boron fertilizers that are not registered or counterfeited, and the boron content is also low. Second, the correct application of boron fertilizer 1, application methods: boron fertilizer application methods are based, pouring and foliar spray three. (1) Base application: When sowing, mix the boron fertilizer with farmyard manure, chemical fertilizer or appropriate amount of fine soil to make basal application or application of basal fertilizer to avoid contact with seeds. (2) Pouring: Mix the boron fertilizer with human or manure water or fertilizer solution, and pour it into the sowing hole as the base fertilizer during sowing or in the early stage and middle stage of rapeseed growing on rape seedlings as top dressing. The effect of pouring the boron fertilizer is better. Dry or foliar spray works better. (3) Foliar spraying: Foliar spraying has the advantages of saving fertilizer, fast crop absorption, flexible application period, and so on. The period of foliar spraying should be sooner rather than later, and the effect of spraying boron fertilizer on rape leaves after flowering is not significant. It is better to spray boron fertilizer twice or more on the surface. 2. Appropriate dosage: The appropriate amount of boron fertilizer depends on the type of soil and the condition of boron deficiency. Generally speaking, the upper limit of boron fertilizer should be applied to the land with severe boron deficiency in sandy soil, and the boron should be applied to the land with less boron deficiency. The lower limit of fertilizer (see the reference table for common boron fertilizers). Common Boron Fertilizer Variety Amount Reference Table Varieties Boron-containing (B) Base Application (g) Application (g) Spray Application (g) Remarks Borax 11% 400-1000 100-200 First dissolve with hot water Boron Fertilizer 20.5% 50-100 50 20 15% 100-200 100 50 12% 100-250 150 50 Liquid Boron Fertilizer 10% 100-250 150 50 Boron-Magnesium 0.5% 10000
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