First, symptomatic use of fertilizer. In order to promote early development or increase 1000-grain weight in the later stage, nitrogen fertilizer and phosphate fertilizer can be sprayed; in order to increase leaf area and promote vegetative growth, nitrogen fertilizer and potassium fertilizer can be selected; for controlling physiological diseases caused by lack of trace elements, micro-fertilizer can be sprayed.
Second, choose the type of fertilizer. The fertilizers used for foliar application are urea, potassium dihydrogen phosphate, potassium nitrate, potassium sulfate, ammonium sulfate, and leachate of superphosphate and grass ash, ammonium metaphosphate and most trace element fertilizers.
Third, master the appropriate amount and concentration. The suitable concentration of crop foliar fertilizer is generally: urea 1% to 2%, potassium dihydrogen phosphate 0.3% to 0.5%, superphosphate calcium leaching solution 3% to 5%, ammonium molybdate 0.01% to 0.1%, ammonium metaphosphate 2% to 3%, zinc sulfate 0.1% to 0.2%, borax (or boric acid) 0.2% to 0.3%, manganese sulfate 0.05% to 0.1%, ferrous sulfate 0.05% to 0.3%, and copper sulfate 0.01% to 0.02%. The amount of fertilizer used per mu is 50-60 kg, and the dicotyledonous crops such as cotton, rape, beans and vegetables should have a suitable lower concentration of spray fertilizer; the leaf area of ​​monocotyledonous crops such as rice, wheat and corn is relatively small. The fertilizer concentration must be appropriately increased when spraying fertilizer.
Fourth, extend the wet time of fertilization. The amount of nutrients absorbed by the leaves during leaf fertilization is related to the length of time the solution is wetted. The longer the wetting time, the more nutrients are absorbed by the leaves, and the better the effect. Under normal circumstances, keep the blade wet time in 30~60 minutes to get better fertilizer efficiency.
5. Determine the reasonable number of sprays. Nitrogen and potassium fertilizers have strong mobility in crops, so they can be sprayed once in the critical period of crop growth; the mobility of phosphate fertilizers is inferior to nitrogen and potassium fertilizers, and must be sprayed 1 or 2 times according to the growth of crops; Zinc, molybdenum, manganese, copper fertilizer and non-moving boron, calcium and other micro-fertilizers that are only partially moved in the crop body should be sprayed continuously for 2 to 3 times.
Sixth, choose the best spray site. The green stems and leaves of crops are reasonable parts of spray fertilizer, especially the green functional leaves that grow young and grow vigorously, and the fertilizer effect is the best. It is worth noting that when spraying the dicotyledonous crops, it should be sprayed evenly on the front and back of the leaves, while the monocotyledonous crops only need to spray the fertilizer from the top to the bottom of the leaves.
Second, choose the type of fertilizer. The fertilizers used for foliar application are urea, potassium dihydrogen phosphate, potassium nitrate, potassium sulfate, ammonium sulfate, and leachate of superphosphate and grass ash, ammonium metaphosphate and most trace element fertilizers.
Third, master the appropriate amount and concentration. The suitable concentration of crop foliar fertilizer is generally: urea 1% to 2%, potassium dihydrogen phosphate 0.3% to 0.5%, superphosphate calcium leaching solution 3% to 5%, ammonium molybdate 0.01% to 0.1%, ammonium metaphosphate 2% to 3%, zinc sulfate 0.1% to 0.2%, borax (or boric acid) 0.2% to 0.3%, manganese sulfate 0.05% to 0.1%, ferrous sulfate 0.05% to 0.3%, and copper sulfate 0.01% to 0.02%. The amount of fertilizer used per mu is 50-60 kg, and the dicotyledonous crops such as cotton, rape, beans and vegetables should have a suitable lower concentration of spray fertilizer; the leaf area of ​​monocotyledonous crops such as rice, wheat and corn is relatively small. The fertilizer concentration must be appropriately increased when spraying fertilizer.
Fourth, extend the wet time of fertilization. The amount of nutrients absorbed by the leaves during leaf fertilization is related to the length of time the solution is wetted. The longer the wetting time, the more nutrients are absorbed by the leaves, and the better the effect. Under normal circumstances, keep the blade wet time in 30~60 minutes to get better fertilizer efficiency.
5. Determine the reasonable number of sprays. Nitrogen and potassium fertilizers have strong mobility in crops, so they can be sprayed once in the critical period of crop growth; the mobility of phosphate fertilizers is inferior to nitrogen and potassium fertilizers, and must be sprayed 1 or 2 times according to the growth of crops; Zinc, molybdenum, manganese, copper fertilizer and non-moving boron, calcium and other micro-fertilizers that are only partially moved in the crop body should be sprayed continuously for 2 to 3 times.
Sixth, choose the best spray site. The green stems and leaves of crops are reasonable parts of spray fertilizer, especially the green functional leaves that grow young and grow vigorously, and the fertilizer effect is the best. It is worth noting that when spraying the dicotyledonous crops, it should be sprayed evenly on the front and back of the leaves, while the monocotyledonous crops only need to spray the fertilizer from the top to the bottom of the leaves.
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