What should we pay attention to when applying foliar fertilizer?

What should we pay attention to when applying foliar fertilizer? What's the reason? Please also know the netizens to help introduce foliar fertilization refers to the non-toxic and harmless organic or inorganic nutrient solution containing various nutrients, according to a certain dose and concentration, sprayed on the foliar surface of the plant, playing the role of supplying nutrients directly or indirectly, called foliar fertilizer spraying, also known as extra-root topdressing. The planting network has sorted out the mistakes and reasons that are easy to occur in the application of foliar fertilizer, which are listed below for netizens' reference. Mistake one, spray at will: some farmers mistakenly think that foliar fertilizer can be sprayed at any growth period of the crop. Foliar fertilizer is absorbed by leaves, which requires crops to have sufficient leaf area, otherwise the effect of spraying is poor and can not achieve the goal. Therefore, fertilizer spraying should generally be carried out in the middle and later stages of crop growth in order to obtain the maximum benefit of foliar fertilizer spraying. Mistake 2, use fertilizer to spray at will: some farmers think that any fertilizer can be used as foliar fertilizer. In fact, some volatile fertilizers, such as ammonia, ammonium carbonate, etc., volatilize ammonia after spraying, which will cause fumigation to the crops. The other is some crop taboo fertilizers, such as potassium chloride, calcium chloride, etc., should not be sprayed on crops such as tobacco. Mistake 3, spray regardless of time: some farmers mistakenly think that it can be carried out at any time. If after rain or early in the morning, when there are water or dew on the leaves, it is not suitable to spray fertilizer, otherwise it will reduce the spraying concentration, can not meet the concentration requirements, and the effect is poor. Avoid spraying in the hot sun at noon on a sunny day, because it can not maintain the wet state for a long time after spraying, and the poor absorption of leaves leads to the reduction of fertilizer use efficiency. Fourth, the concentration is changed at will: some farmers think that the higher the concentration of spraying, the better the effect. Foliar fertilization only plays a supplementary and regulatory role, and can not replace soil fertilization. The concentration of fertilizer should be strictly controlled. In the suitable range of use, the general concentration of spraying should be low rather than high. However, different crops have different fertility tolerance and different requirements; different kinds of fertilizers and different concentrations of fertilizer are sprayed. Too low concentration can not reach the effect of fertilizer spraying; if the concentration is too high, it often dehydrates the leaves and causes fertilizer damage. This is one of the keys to the success or failure of foliar fertilizer spraying. For example, when urea is used as foliar fertilizer, the concentration of calcium superphosphate is generally 0.5%, potassium dihydrogen phosphate is 0.2%, boric acid is 0.1%, ammonium molybdate is 0.02-0.05%, and zinc sulfate is 0.05%. 0.2%. At the same time, it is necessary to grasp that the concentration of spraying at the seedling stage should be appropriately lower; the concentration of spraying in the middle and later stages of growth should be appropriately higher; when crops grow normally, the concentration should be lower, and when there is a deficiency of fertilizer, the concentration of trace element fertilizer should be lower; the concentration of major element fertilizer should be appropriately higher; the concentration of dicotyledon spraying should be lower; and the concentration of Monocotyledon spraying should be appropriately higher. Error 5. Mix fertilizers at will: some farmers mistakenly believe that no matter what kind of fertilizers or pesticides, they can be mixed and sprayed at will. Due to the different properties of various chemical fertilizers or pesticides, drug damage will be caused if they are used casually. Mistake 6. Excessive spraying times: some farmers mistakenly think that the more times of foliar fertilizer spraying, the better. The crops with short growth period are generally sprayed with 1 Mel twice, and those with long growth period can be sprayed 2 Mel 3 times. According to the soil fertility of the seedlings, it can also be sprayed for 1 more times. It should be sprayed continuously in the same growth period with an interval of about 10 days each time. Spray trace element fertilizer, spray once, want to spray the second time, the interval should be lengthened. Click to get more foliar fertilizer application methods