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Crops top dressing fertilizer "Shiyan"
Crop top-dressing fertilizer has the advantages of rapid fertilizer efficiency, high utilization rate, convenient application, significant effect, and saving fertilizer. But to be scientific and reasonable, we must have the following know-how: First, fertilizer varieties should be suitable: urea, potassium dihydrogen phosphate, calcium superphosphate, potassium sulfate, leaching liquid and some micro-fertilizers are better for use outside the roots, and Chloride-containing, volatile and insoluble fertilizers such as ammonium bicarbonate, ammonium chloride, calcium magnesium phosphate, etc. should not be used. Second, the spray concentration is appropriate: the appropriate concentration of top dressing is: urea 0.5% ~ 2%, potassium dihydrogen phosphate 0.3 ~ 0.5%, ammonium sulfate 0.2% ~ 9.3%, borax 0.1 ~ 0.2%, zinc sulfate 0.1 ~ 0.4% Different crops use different concentrations, vegetable concentrations are slightly higher, and fruit tree concentrations are slightly lower. Under normal circumstances, the concentration must not be arbitrarily increased to avoid causing damage. Third, the amount of liquid spray should be sufficient: according to the specific type of crops, growth period to determine, with the fertilizer solution will flow from the leaves but not the best when flowed. General mu fertilizer 50 to 75 kg. Fourth, the spraying frequency should not be too little: Even if spraying 1% urea, the amount of mu is only 2 kg of urea. This amount is much lower than the crop demand, so it must be sprayed 2 or 3 times in succession, with an interval of 7 to 10 days. Fifth, to select the spray time: outside the top dressing in a relatively humid weather as well, to ensure that the leaves wet 30 to 60 minutes. To spray before 10 o'clock in the morning and after 5 o'clock in the afternoon, a cloudy day without wind can be sprayed all day. Sixth, in the critical period of crop spraying: Different crops have different requirements for various fertilizers, and should be flexible. For example, rice and wheat should be in the heading stage, rapeseed, peanut and sesame should be in the initial flowering period, and corn and sorghum should be sprayed in the grain filling stage. In addition, when a crop appears to have a certain detoxification condition, it must be sprayed in a timely manner. Seven, spray the site to be appropriate: Fertilizer should focus on spraying on the young leaves and stems of the crop. Spray as much as possible on the back of the dicotyledonous plant, spray on both sides of the monocotyledonous plant, and mainly positive. VIII. Pay attention to reasonable mixing: Fertilizers can be mixed and sprayed with two or more fertilizers; fertilizers and pesticides can improve ergonomics. It should be noted that alkaline and acidic fertilizers as well as fertilizers that will react cannot be mixed. Nine, fertilizer spray should be uniform: fertilizer should be fully stirred, spraying should be uniform, can not leak spray, can not be sprayed in the same spraying process. 10. Add active agent: Adding a small amount of active agent (such as neutral soap, washing powder, etc.) to the fertilizer can reduce the surface tension of the fertilizer solution, increase the contact area between the fertilizer solution and the blade, and improve the spraying effect.