1. as long as the "chemical" can be sprayed, wrong!
When spraying fertilizer on crops and vegetables, some farmers like to apply several kinds of leaf fertilizer together, thinking that the more complete the variety, the better the effect. Many farmers believe that any fertilizer can be sprayed as leaf fertilizer as long as it "melts", but it is not.
For example, highly volatile fertilizers such as ammonia water and ammonium bicarbonate, if sprayed as leaf fertilizer, the high temperature after spraying will cause damage to crops and burn leaves, so they cannot be used as leaf fertilizer. Moreover, many micro fertilizers cannot be mixed with pesticides, and acid and alkaline fertilizers cannot be mixed and sprayed. Fertilizer fertilizer and fertilizer medicine should be mixed and applied in a targeted way to play the role of "one-time spraying, multiple effects", otherwise it will backfire.
2. the higher the spraying concentration, the better. Wrong!
Some farmers believe that the higher the concentration of foliar fertilizer spraying solution, the better. This is incorrect. For example, high nitrogen water-soluble fertilizer should only be less than 1%, potassium dihydrogen phosphate should also be less than 1%, and more medium and trace element fertilizers such as sugar alcohol calcium fertilizer, sugar alcohol calcium boron fertilizer, sugar alcohol zinc, chelated iron, chelated copper, etc. should only be less than 0.2%. In case of excessive concentration, it will not play the role of fertilizer spraying. On the contrary, it will cause dehydration and wilting of crop leaves, leading to fertilizer damage, which is similar to drug damage and poison. Generally, spraying fertilizer liquid on the front and back sides of the leaves starts to drop. Too much fertilizer will lead to rising costs and waste of fertilizer.
3. it can be sprayed at any time, wrong!
Some farmers can not grasp the key spraying period, so they can not achieve the desired effect. Some farmers believe that foliar fertilizer spraying can be carried out at any time during plant growth and development. In fact, it is also wrong.
Foliar fertilizer spraying is best carried out at the turning point of crop growth, with an interval of at least 20 days. Generally speaking, it is sprayed 2-3 times per season. There are some differences in the suitable period of foliar fertilizer spraying for different plants and fertilizers. Rice, corn, wheat and other cereal crops should be sprayed with fertilizer during booting, flowering and filling stages.
Soybean, peanut, broad bean, kidney bean and other legume crops should be sprayed with fertilizer during the flowering and pod setting period. Cotton should be sprayed with fertilizer during the flowering and Bolling period. Molybdenum fertilizer should be sprayed before flowering. Boron fertilizer and zinc fertilizer had the best effect at the early flowering stage.
In terms of fertilizer spraying time, it should be in the morning of a windless cloudy or sunny day, after the dew on the leaf surface is dry, avoid the hot sun and high temperature period, and the spraying effect in the morning and evening is good.
