Foliar fertilization of crops, also known as root dressing, has the advantages of quick fertilizer efficiency, fertilizer saving, good effect and easy use. According to the data, in the moderately fertile soil, foliar fertilization in time can increase the yield of food crops by 5-10%, fruit trees by 5%-15%, and vegetables by 20%-30%. However, the following points must be noted in use:
1, to symptomatic spray. In accordance with the principle of what is missing, it should be sprayed according to crops and lack of fertilizer. If the seedlings are thin and yellow, indicating that nitrogen deficiency should be based on nitrogen spray; if the seedlings are weak, they should be mainly nitrogen and phosphorus mixed; if the seedlings are in general, they should be sprayed with phosphorus and potassium. .
2, the correct choice of fertilizer varieties. Not any fertilizer can be used as foliar spray. Commonly used fertilizers are urea, potassium dihydrogen phosphate, superphosphate, borax, zinc sulfate, and ash. Some volatile, insoluble, and chloride-containing fertilizers are not suitable for foliar application, such as ammonium chloride, ammonium bicarbonate, calcium magnesium phosphate, and ammonia. Fertilizers that are contraindicated in certain crops, such as calcium chloride and potassium chloride, should not be sprayed on crops such as tobacco.
3, the spray concentration should be appropriate. Foliar fertilization only plays a role in supplementation and regulation and cannot replace soil fertilization. Strict control of fertilization concentration is required. In a suitable range, the general spraying concentration should be low and not high. Mastering the concentration is the key to foliar spray. For example, the fertilization concentration of urea is generally 0.5%-2%; the superphosphate is 1%-5%; the potassium dihydrogen phosphate is 0.2%-0.5%; the boric acid is 0.1%-5%; the ammonium molybdate is 0.02%. -0.05%; zinc sulfate is 0.05%-0.2%, and ammonium sulfate is 0.2%-0.3%; Generally, the spraying concentration in the seedling stage should be lower, and the concentration of spraying in the middle and late growth stages should be higher. When the growth of the crop is normal, the concentration is lower. When the fertilizer is deficient, the concentration should be higher; the concentration of the trace element fertilizer is sprayed. It should be lower, the concentration of the macro-element fertilizer should be higher; the concentration of the dicotyledon should be lower, and the concentration of the monocot should be higher.
4. The amount of spray liquid should be sufficient. The specific amount should be determined according to the type of crop and its different growth period. The general requirement is that the fertilizer should flow down from the foliage, but it is not shed. Generally, the amount of fertilizer used per mu is 50-70 kg. At the same time, the number of spraying should be appropriate. The crops with short growth period are generally sprayed 1-2 times; the long growing period 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 about 10 days. Spraying a small amount of element can be applied once. If you want to spray the second time, the interval should be longer. (Source: China Fertilizer Network)
1, to symptomatic spray. In accordance with the principle of what is missing, it should be sprayed according to crops and lack of fertilizer. If the seedlings are thin and yellow, indicating that nitrogen deficiency should be based on nitrogen spray; if the seedlings are weak, they should be mainly nitrogen and phosphorus mixed; if the seedlings are in general, they should be sprayed with phosphorus and potassium. .
2, the correct choice of fertilizer varieties. Not any fertilizer can be used as foliar spray. Commonly used fertilizers are urea, potassium dihydrogen phosphate, superphosphate, borax, zinc sulfate, and ash. Some volatile, insoluble, and chloride-containing fertilizers are not suitable for foliar application, such as ammonium chloride, ammonium bicarbonate, calcium magnesium phosphate, and ammonia. Fertilizers that are contraindicated in certain crops, such as calcium chloride and potassium chloride, should not be sprayed on crops such as tobacco.
3, the spray concentration should be appropriate. Foliar fertilization only plays a role in supplementation and regulation and cannot replace soil fertilization. Strict control of fertilization concentration is required. In a suitable range, the general spraying concentration should be low and not high. Mastering the concentration is the key to foliar spray. For example, the fertilization concentration of urea is generally 0.5%-2%; the superphosphate is 1%-5%; the potassium dihydrogen phosphate is 0.2%-0.5%; the boric acid is 0.1%-5%; the ammonium molybdate is 0.02%. -0.05%; zinc sulfate is 0.05%-0.2%, and ammonium sulfate is 0.2%-0.3%; Generally, the spraying concentration in the seedling stage should be lower, and the concentration of spraying in the middle and late growth stages should be higher. When the growth of the crop is normal, the concentration is lower. When the fertilizer is deficient, the concentration should be higher; the concentration of the trace element fertilizer is sprayed. It should be lower, the concentration of the macro-element fertilizer should be higher; the concentration of the dicotyledon should be lower, and the concentration of the monocot should be higher.
4. The amount of spray liquid should be sufficient. The specific amount should be determined according to the type of crop and its different growth period. The general requirement is that the fertilizer should flow down from the foliage, but it is not shed. Generally, the amount of fertilizer used per mu is 50-70 kg. At the same time, the number of spraying should be appropriate. The crops with short growth period are generally sprayed 1-2 times; the long growing period 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 about 10 days. Spraying a small amount of element can be applied once. If you want to spray the second time, the interval should be longer. (Source: China Fertilizer Network)
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