The top dressing of the crop root has the advantages of quick fertilizer efficiency, high utilization rate, convenient application, remarkable effect, and fertilizer saving. How to apply root external fertilizer is scientific and reasonable? Hui Nongwang Xiaobian believes that the following ten points must be mastered: First, the fertilizer variety should be suitable: Urea, potassium dihydrogen phosphate, superphosphate, potassium sulphate, ash ash and some micro-fertilizers are better for root-dressing, while chloride-containing, volatile and poorly soluble fertilizers such as ammonium bicarbonate, ammonium chloride, calcium Magnesium and phosphorus should not be used. Second, the spray concentration is appropriate: The suitable concentration of top dressing is: urea 0.5% to 2%, potassium dihydrogen phosphate 0.3 to 0.5%, ammonium sulfate 0.2% to 9.3%, borax 0.1 to 0.2%, zinc sulfate 0.1 to 0.4%, and different crop concentrations. The concentration of vegetables is slightly higher, and the concentration of fruit trees is slightly lower. Under normal circumstances, the concentration should not be increased arbitrarily to avoid causing fat damage. Third, the amount of spray liquid should be sufficient: Specifically, it is determined according to the type of crop and the growth period, and it is best when the fertilizer liquid will flow down from the leaf surface but not flow down. Generally, the fertilizer is 50-75 kg. Fourth, the number of sprays should not be too small: Even if 1% of the urea solution is sprayed, the amount of the acre is only 2 kg of urea. This amount is much lower than the demand for crops, so it must be sprayed continuously for 2 to 3 times at intervals of 7 to 10 days. Fifth, we must choose the time of spraying: It is better to carry out the top dressing in the damp weather to ensure that the leaves are wet for 30 to 60 minutes. To spray before 10 o'clock in the morning and after 5 o'clock in the afternoon, the windless cloudy sky can be sprayed all day. 6. Spraying during the critical period of the crop: Different crops have different requirements for various fertilizers, so they need to be flexible. For example, rice and wheat should be in the heading stage, rapeseed, peanuts and sesame should be in the initial flowering stage, and corn and sorghum should be sprayed in the filling stage. In addition, when there is some de-fertilization condition in the crop, it should be sprayed in time. Seven, the spraying site should be appropriate: The fertilizer should be sprayed on the young stems and leaves of the crop. The dicotyledonous plants are sprayed as much as possible on the back side, and the monocotyledonous plants are sprayed on both sides and are mainly positive. Eight, pay attention to reasonable mixing: Spraying two or more kinds of fertilizers can improve fertilizer efficiency; mixing fertilizers and pesticides can improve work efficiency. It should be noted that alkaline and acidic fertilizers and pesticides that react may not be mixed. Nine, the fertilizer spray should be even: The fertilizer should be fully stirred, sprayed evenly, not leaking, or sprayed repeatedly during the same spraying process. Ten, to 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. The Laser Distance Meter is precise measuring tools with high accuracy and 100m long distance. The laser distance measurer can be used indoor and outdoors. It's widely used in many areas, specially in construction industry, thanks to the IP54 dust and water resistant. The digital height measurement device Laser Distance Meter 100M,Laser Meter 100M,Laser Measure 100M Range,100M Laser Distance Meter Chengdu JRT Meter Technology Co., Ltd , http://www.rangesensors.com
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