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1. Spray concentration should be suitable. Different foliar fertilizers have different concentrations; different crop types have different spraying concentrations; the same crops have different spraying concentrations at different growth stages. Therefore, when performing foliar spray fertilizer, it is necessary to flexibly grasp the specific conditions and prepare a suitable concentration. Otherwise, the concentration is too low, and the concentration is too high, which will damage the stems and leaves.
2. Mix the fertilizer solution. Some trace element fertilizers such as borax are not easily soluble in cold water, and are only completely soluble when the water temperature is above 40 °C. When preparing the borax solution, dissolve it with a small amount of warm water and then dilute it to the desired concentration with water to make the fertilizer liquid uniform. After the fertilizer solution is prepared, it should be sprayed in time to prevent re-precipitation after a long time.
3, the spraying site should be comprehensive. Many farmers often only spray the fertilizer solution on the front of the blade and ignore the back of the leaf, which is often unsatisfactory. Because foliar fertilizer is mainly absorbed by the leaves through the pore diffusion, and the distribution of the pores on the leaves, generally the back of the leaves is more than the front of the leaves. Therefore, when spraying the foliar fertilizer, it is necessary to pay attention to the front and back of the leaves to be sprayed to expand The absorption surface, especially the dicotyledon, should pay more attention to the wet back.
4. The number of spraying should be appropriate. After the nitrogen and potassium fertilizers are absorbed by the leaf surface, they are transported quickly and can reach all parts of the crop faster. Therefore, it can be sprayed once in the critical period of fertilizer requirement. Phosphate fertilizer and other trace elements move at a slower speed. Generally, it should be sprayed 2-3 times, and sprayed once every 7-10 days to have a good effect. The mobility of trace element iron is poor. It is advisable to spray iron-containing fertilizer on fruit trees 3-4 times, and spray once every 5-7 days.
5, spraying time should be appropriate. Fertilizer solution in crops. The longer the stay on the blade, the better the absorption of the fertilizer by the blade, thereby improving the utilization. The spraying effect of foliar fertilizer is affected by factors such as high temperature, light intensity, rainwater, etc. Spraying should be carried out on a windless cloudy day and a sunny day, especially in the evening, because the light is not too strong and the temperature is low. The long time of wetting on the leaves after application is beneficial to absorption and enhance fertilizer efficiency. Be sure to avoid the noon on sunny days, especially the hot days, to avoid the evaporation of fertilizer in a short time, affecting absorption. Do not spray foliar fertilizer before the rain to prevent the fat from being lost by the rain.
It is worth noting that foliar fertilization cannot completely replace the rhizosphere fertilization of crops, because the roots of the crops have larger and better absorption systems than the leaves, and only the rational application of rhizosphere fertilizers, combined with the application of foliar fertilizers. In order to fully exert the effect of increasing yield and quality of foliar fertilizer. 
Technical requirements for foliar spray fertilizer
Spraying foliar fertilizer on crops is a fertilization measure that can strengthen the nutrition of crops and prevent certain diseases, and is also an effective fertilization technology that can improve fertilizer utilization. However, improper spraying will not be effective or counterproductive. Therefore, in order to improve the spraying effect of foliar fertilizer, the following technical requirements must be mastered:
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