Due to the complex soil types and the wide variety of crops, the lack of trace elements in various places exists to varying degrees. In production, the application of micro-fertilizers by foliar application, soil topdressing and mixing (dipping) can alleviate the lack of trace elements. Crops require very little trace elements, and farmers should pay special attention to the application concentration of micro-fertilizers when applying micro-fertilizers. Boron fertilizer mainly includes borax and boric acid, followed by boron and magnesium fertilizer. Borax and boric acid are commonly used boron fertilizers. The application rate is 0.5-0.75 kg per mu of soil , 0.1% -0.3% of foliar spray concentration , 0.01-0.1% of soaking seed concentration, and 0.2-0.5 g of fertilizer per kg of seed dressing . Zinc fertilizer mainly has zinc sulfate, in addition to zinc oxide, zinc chloride, and chelated zinc. Zinc sulphate is a commonly used zinc fertilizer. The soil is applied for 1 to 2 kg per mu , the foliar spray concentration is 0.01 to 0.05%, and the soaking concentration is 0.02% to 0.05%, that is, 1 to 3 grams per kg of seed fertilizer. The molybdenum fertilizer mainly has ammonium molybdate, followed by sodium molybdate and molybdenum trioxide. Ammonium molybdate is a commonly used molybdenum fertilizer. It is applied 50-150 g per mu of soil, sprayed at a concentration of 0.01-0.1%, soaked with a concentration of 0.05%-0.1%, and mixed with 2-5 g of fertilizer per kg of seeds. The copper fertilizer mainly includes copper sulfate, and there are also copper oxide, chelated copper, and copper-bearing slag. Copper sulphate is a commonly used copper fertilizer, with 0.8-1.5 kg per acre of soil , 0.01% to 0.05% of foliar spray, 0.01% to 0.05% of soaking seed, and 0.3 g of seed per kg of seed. Manganese fertilizer mainly includes manganese sulfate, followed by manganese carbonate, manganese chloride and manganese oxide. Manganese sulfate is a commonly used manganese fertilizer. It is applied 1 to 2 kg per mu of soil, with a foliar application concentration of 0.05% to 0.2%, a soaking concentration of 0.05% to 0.1%, and 4 to 8 grams of fertilizer per kg of seed dressing. Iron fertilizer mainly includes ferrous sulfate, and also ferrous sulfate ammonium and iron chelate. Ferrous sulfate is a commonly used variety, with 5 kg per acre of soil and a foliar application concentration of 0.5% to 0.3%.
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