What are the skills of beating foliar fertilizer?

What are the skills of beating foliar fertilizer? Please guide the method when spraying foliar fertilizer can refer to the following methods: first, to be symptomatic. In order to promote early development or increase 1000-grain weight in later stage, nitrogen and phosphate fertilizer can be sprayed; nitrogen and potassium fertilizer can be sprayed to increase leaf area and promote vegetative growth; and micro-fertilizer can be applied to prevent physiological diseases caused by lack of trace elements. Second, it is necessary to choose the right type of fertilizer. The fertilizers with good effect of foliar spraying are urea, potassium dihydrogen phosphate, potassium nitrate, potassium sulfate, ammonium sulfate, leaching solution of calcium superphosphate and plant ash, ammonium metaphosphate and most trace element fertilizers. Third, the concentration should be appropriate. If the concentration is too high, it is easy to cause fertilizer damage and cause unnecessary loss; if the concentration is too low, it will not get the desired effect. The suitable concentrations for foliar spraying of common leaf fertilizer are as follows: urea 0.5%-2%, calcium superphosphate leaching solution 2%-3%, potassium dihydrogen phosphate 0.3%-0.5%, potassium sulfate 1%-1.5%, plant ash leaching solution 5%-9%, ferrous sulfate 0.2% 10%, boric acid 0.02% 0.1%, borax, 0.05% sodium 0.2%, manganese sulfate 0.0% 1.0%, Zinc sulfate 0.01% potassium 0.05%, ammonium molybdate 0.02% potassium 0.05%. It should be noted that different crops have different concentration requirements for different fertilizers. Take urea as an example, the suitable spraying concentration is 1.5%-0.8% on rice and other gramineous crops, and 0.4%-0.8% on sweet potatoes, potatoes and peanuts. Fourth, prolong the leaf wetting time. The amount of nutrients absorbed by leaves during foliar fertilization is related to the time of wetting leaves with solution. the longer the wetting time is, the more nutrients are absorbed by leaves, the better the effect is. In general, better fertilizer effect can be obtained by keeping the leaf wetting time at 30-60 minutes. Therefore, the most favorable time for foliar fertilization is in the evening when there is no wind, and it is not suitable for foliar fertilization on rainy days, before rain or in the morning with dew; if it rains within 3 hours after foliar fertilization, it should be applied once after sunny days, but the concentration should be appropriately reduced. Fifth, the times of spraying fertilizer are reasonable. The concentration of foliar fertilization of crops is generally low, and the amount of absorption is very small each time. Therefore, the frequency of foliar fertilization should not be less than twice. The mobility of nitrogen and potassium fertilizer in crops is very strong, so it can be sprayed once in the critical period of crop growth, and the mobility of phosphate fertilizer is inferior to that of nitrogen and potassium fertilizer, which should be sprayed twice according to the growth status of crops. generally, zinc, molybdenum, manganese, copper fertilizer and immobile boron and calcium fertilizers which are only partially moved in crops should be sprayed continuously for 2 times. Sixth, choose the best part of spraying fertilizer. The green stems and leaves of crops are the reasonable parts of spraying fertilizer, especially the young and vigorous green functional leaves have the best fertilization effect. It is worth noting that when spraying fertilizer on dicotyledonous crops, it is necessary to spray equally evenly on the front and back of the leaves, while monocotyledonous crops only need to spray fertilizer on the front of the leaves from top to bottom. 7. Mix it properly. The reasonable mixing of two or more foliar fertilizers can save spraying time and labor, and the effect of increasing yield will be more significant. However, foliar fertilizer must be mixed without adverse reactions or reduce fertilizer efficiency, otherwise, not only can not achieve the purpose of mixed use, but also easy to produce fertilizer damage. Click to get more foliar fertilizer application methods