Technical introduction Crops in the growing season show that the deficiency of the disease needs to be supplemented, or when the crops and pests need to be combined with spraying, add a little foliar fertilizer, you must pay attention to the appropriate concentration, otherwise you can not only get twice the result with half the effort, but also It will increase costs and even cause unnecessary losses and waste. So what is the usual concentration of foliar fertilizer for general crops? Urea is 1% - 1.5% aqueous solution, that is, 100 kg of water plus 1-1.5 kg of urea (hereinafter, by analogy). The superphosphate was mixed with 2%-3% aqueous solution and water for 24 hours, and then the clear liquid was sprayed. Potassium dihydrogen phosphate was 0.3%, that is, 300 g of potassium dihydrogen phosphate plus 100 kg of water was taken. The zinc sulfate aqueous solution is 0.1%--0.2 ‰, and a small amount of lime liquid can be added to the solution after spraying. The usual concentration of potassium sulfate is 1% to 1.5%. Ammonium molybdate is 0.05% to 0.1%. Borax (or boric acid) is 0.2%--0.3%. When preparing, use a small amount of 45 °C hot water to dissolve the borax and then the water. The grass ash is 5-7%. For example, add water with hay and ash, stir, and let stand for 15 hours for filtration. The concentration of rare earth in vegetables and food crops is 0.08%, and that of fruit trees is 0.1%. The concentration of the production bacteria on the crops is usually 15-30 ml to 40--50 kg for water. The fruit tree is used for 80--100 ml, and the water is 100--150 kg. Paclobutrazol is used in crops at a concentration of 25--50 mg/kg; fruit trees are 1000-1500 mg/kg. Rice vinegar is usually used at a concentration of 250 ml to 50 kg of water.
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