Foliar application of fertilizer is simple and easy to use, with less fertilizer, quick fertilizer effect and significant yield increase. According to statistical data analysis, in the moderately fertile soil, the required nutrients are sprayed on the crop leaves in time, which can increase the yield of grain crops by 5-10%, fruit trees by 5-15%, and vegetables by 20-30%. However, in some places, due to improper understanding or application, the application effect is not good, and even into the misunderstanding, not only is unfavorable to production, but also causes losses.
First, any spray mistakenly believes that foliar fertilizer can be sprayed at any growth period of the crop. Foliar spray fertilizer is absorbed by the leaves, which requires that the crops have sufficient leaf area, otherwise the effect of spraying is poor, and the purpose is not achieved. Therefore, the spraying fertilizer should generally be carried out in the middle and late stages of crop growth, in order to obtain the maximum foliar fertilizer efficiency.
Second, any use of fertilizer mistakenly believe that any fertilizer can be used for foliar fertilizer application. In fact, some volatile fertilizers, such as ammonia, ammonium bicarbonate, etc., will release smog after crops. The other is that certain crops are contraindicated, such as potassium chloride, calcium chloride, etc., and should not be sprayed on crops such as tobacco.
Third, spray at any time and mistakenly believe that any time can be carried out. If it is rainy or early in the morning, it is not advisable to spray fertilizer when there are water drops or dew on the leaves. Otherwise, the spraying concentration will be lowered, the concentration requirement will not be reached, and the effect is poor. In the hot sun at noon, it is not allowed to spray in the hot sun, because it can not maintain a wet state for a long time after spraying, the leaf absorption is poor, and the utilization rate is reduced.
Fourth, the effect of large concentration is wrong. The higher the concentration of spraying, the better the effect. Foliar fertilization only plays a role in supplementation and regulation and cannot replace soil fertilization. The fertilization concentration should be strictly controlled. In the range of suitable use, the concentration of general spraying should be low and not high. However, different crops have different fertility tolerances and different requirements; the types of fertilizers are different, and the concentration of spraying is also different. If the concentration is too low, the effect of spraying will not be achieved; if the concentration is too high, the leaves will be dehydrated and cause fat damage. This is one of the keys to the success of foliar spray fertilizer. For example, urea is used as foliar fertilizer, the concentration is generally 0.5%-2.0%; superphosphate is 1%-5%; potassium dihydrogen phosphate is 0.2%-0.5%; Boric acid is 0.1%-0.5%; molybdate amine is 0.02%-0.05%; zinc sulfate is 0.05%-0.2%. At the same time, it is necessary to grasp the concentration of spraying at the seedling stage should be lower; the concentration of spraying in the middle and late growth period can be higher; when the growth of the crop is normal, the concentration is lower, and when the fertilizer is deficient, the concentration should be higher; The concentration of elemental fertilizer should be lower; the concentration of macro-element fertilizer should be higher; the concentration of dicotyledon should be lower; the concentration of monocots should be higher.
V. Random mixed application It is wrong to believe that no matter what kind of fertilizer or pesticide, it can be mixed and sprayed at will.
Sixth, increase the number of spraying mistakes that the more the number of foliar sprays, the better. Crops with short growth periods are generally sprayed 1-2 times; long periods of growth can be sprayed 2-3 times. According to the situation of the seedlings, it is also possible to spray more than 1-2 times. Spray continuously in the same growth period, each time should be about 10 days. Spray the trace element fertilizer and spray it once. If you want to spray it a second time, the interval should be longer.
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