Seven principles of crop foliar fertilizer
1. Fertilizers should be selected as fertilizers suitable for foliar application. They are usually called leaf fertilizer or foliar fertilizer. Commonly used in production are urea, potassium dihydrogen phosphate, superphosphate, potassium sulfate, borax, ammonium molybdate, and sulfuric acid. Zinc, rare earth, etc.; ammonium bicarbonate, ammonia water, ammonium chloride, calcium magnesium phosphate fertilizer, etc. should not be used for foliar application.
Second, the concentration should be suitable for foliar fertilization must control the concentration of spraying, too high concentration is easy to produce fertilizer damage, causing unnecessary losses; if the concentration is too low, it will not receive the desired effect. The suitable concentration of commonly used leaf fertilizer foliar spray is: urea 0.5% to 2%, superphosphate calcium leaching solution 2% to 3%, potassium dihydrogen phosphate 0.3% to 0.5%, potassium sulfate 1% to 1.5%, grass ash leaching solution 5 %～9%, ferrous sulfate 0.2%～10%, boric acid 0.02%～0.1%, borax, 0.05%～0.2%, manganese sulfate 0.0%～1.0%, zinc sulfate 0.01%～0.05%, ammonium molybdate 0.02% ~0.05%. It should be noted that different crops have different concentration requirements for different fertilizers. Taking urea as an example, the suitable spraying concentration on grass crops such as rice is 1.5% to 2%, and the suitable concentration on sweet potato, potato and peanut is 0.4% to 0.8%.
Third, the time should be suitable for the amount of nutrients absorbed by the leaves and the time of the wet leaves of the fertilizer. The longer the wetting time, the more nutrients are absorbed by the leaves, and the better the effect. In general, it is preferred to keep the blade wet time in the range of 30 to 60 minutes. Therefore, the most favorable time for foliar fertilization is in the evening without wind, and it is not suitable for foliar fertilization on rainy days, rainy days or mornings with dew; if it is rained within 3 hours after fertilization on the foliar surface, it should be applied after sunny days. Once, but the concentration should be reduced appropriately.
Fourth, spraying should be evenly foliar fertilization, the front and back sides of the leaves should be sprayed. It is required to make the droplets small and spray evenly, especially pay attention to the upper leaves and the back of the leaves where the crops are vigorously grown, because the new leaves are faster than the old leaves and the back of the leaves, and the absorption capacity is strong. For crops whose front surface of the stratum corneum is thicker than the back surface, it is more important to spray the back of the leaf to facilitate absorption.
Fifth, the number of times can not be less than the concentration of foliar fertilization of the crop is generally low, and the amount of absorption per time is also very small. Therefore, the number of foliar application should generally not be less than two. For nutrients (iron, boron, calcium, phosphorus, etc.) that have little or no mobility in the crop, it should be noted that the number of spraying is appropriately increased.
Sixth, mixed use should be properly mixed two or more foliar fertilizers, can save spraying time and labor, its production will be more significant. However, after the foliar fertilizer is mixed, there must be no adverse reactions or no reduction in fertilizer efficiency. Otherwise, it will not be able to achieve the purpose of mixing, and it is easy to produce fertilizer.
7. Adding Wetting Agents There are a layer of thick and thin stratum corneum on the leaves of the crop. It is difficult to infiltrate the solution. To this end, an appropriate amount of humectant, such as neutral soap, better quality detergent, etc., can be added to the leaf fertilizer solution to reduce the surface tension of the solution, increase the contact area with the leaves, and improve the effect of foliar fertilization.
Source: Hebei Science and Technology News
Second, the concentration should be suitable for foliar fertilization must control the concentration of spraying, too high concentration is easy to produce fertilizer damage, causing unnecessary losses; if the concentration is too low, it will not receive the desired effect. The suitable concentration of commonly used leaf fertilizer foliar spray is: urea 0.5% to 2%, superphosphate calcium leaching solution 2% to 3%, potassium dihydrogen phosphate 0.3% to 0.5%, potassium sulfate 1% to 1.5%, grass ash leaching solution 5 %～9%, ferrous sulfate 0.2%～10%, boric acid 0.02%～0.1%, borax, 0.05%～0.2%, manganese sulfate 0.0%～1.0%, zinc sulfate 0.01%～0.05%, ammonium molybdate 0.02% ~0.05%. It should be noted that different crops have different concentration requirements for different fertilizers. Taking urea as an example, the suitable spraying concentration on grass crops such as rice is 1.5% to 2%, and the suitable concentration on sweet potato, potato and peanut is 0.4% to 0.8%.
Third, the time should be suitable for the amount of nutrients absorbed by the leaves and the time of the wet leaves of the fertilizer. The longer the wetting time, the more nutrients are absorbed by the leaves, and the better the effect. In general, it is preferred to keep the blade wet time in the range of 30 to 60 minutes. Therefore, the most favorable time for foliar fertilization is in the evening without wind, and it is not suitable for foliar fertilization on rainy days, rainy days or mornings with dew; if it is rained within 3 hours after fertilization on the foliar surface, it should be applied after sunny days. Once, but the concentration should be reduced appropriately.
Fourth, spraying should be evenly foliar fertilization, the front and back sides of the leaves should be sprayed. It is required to make the droplets small and spray evenly, especially pay attention to the upper leaves and the back of the leaves where the crops are vigorously grown, because the new leaves are faster than the old leaves and the back of the leaves, and the absorption capacity is strong. For crops whose front surface of the stratum corneum is thicker than the back surface, it is more important to spray the back of the leaf to facilitate absorption.
Fifth, the number of times can not be less than the concentration of foliar fertilization of the crop is generally low, and the amount of absorption per time is also very small. Therefore, the number of foliar application should generally not be less than two. For nutrients (iron, boron, calcium, phosphorus, etc.) that have little or no mobility in the crop, it should be noted that the number of spraying is appropriately increased.
Sixth, mixed use should be properly mixed two or more foliar fertilizers, can save spraying time and labor, its production will be more significant. However, after the foliar fertilizer is mixed, there must be no adverse reactions or no reduction in fertilizer efficiency. Otherwise, it will not be able to achieve the purpose of mixing, and it is easy to produce fertilizer.
7. Adding Wetting Agents There are a layer of thick and thin stratum corneum on the leaves of the crop. It is difficult to infiltrate the solution. To this end, an appropriate amount of humectant, such as neutral soap, better quality detergent, etc., can be added to the leaf fertilizer solution to reduce the surface tension of the solution, increase the contact area with the leaves, and improve the effect of foliar fertilization.
Source: Hebei Science and Technology News
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