First, the variety selection
Urea, potassium dihydrogen phosphate, superphosphate, potassium sulphate, ash ash and some micro-fertilizers are used for foliar application, while chloride-containing, volatile and poorly soluble fertilizers such as ammonium bicarbonate, ammonium chloride, calcium Magnesium and phosphorus should not be used.
Second, the concentration is suitable
Generally, the concentration of urea is 0.3% to 0.5%, potassium dihydrogen phosphate is 0.3 to 0.5%, potassium nitrate is 0.2 to 0.4%, potassium sulfate is 0.5%, ammonium sulfate is 0.2% to 0.3%, borax is 0.1 to 0.2%, and zinc sulfate is used. 0.1 to 0.4%.
The concentration of different crops will vary, the concentration of vegetables is slightly higher, and the concentration of fruit trees is slightly lower.
Note: Under normal circumstances, the concentration can not be increased at will, so as not to cause fat damage.
Third, full spraying
The fertilizer should be fully stirred, sprayed evenly, not leaking, and not sprayed repeatedly during the same spraying process.
It is best to use the fertilizer liquid to flow from the leaf surface but not to shed. Generally, the fertilizer is 50-75 kg.
Fourth, the number of sprays
The number of foliar application should not be too small, and it can be sprayed continuously for 2 to 3 times, with an interval of 7 to 10 days, and the effect is better.
Five, fertilization time
Spraying in wet weather is better, ensuring that the leaves are wet for 30 to 60 minutes. It is best to spray before 10 o'clock in the morning or after 5 o'clock in the afternoon. It can be sprayed all day without a windy cloudy sky.
Sixth, select the critical period
Different crops have different requirements for various fertilizers and should be flexible. For example, rice, wheat, corn and other gramineous crops can be sprayed at the heading stage and filling stage; rapeseed, peanuts, sesame seeds, etc. should be sprayed at the beginning flowering stage, and so on.
In addition, when the crop has some symptoms of deficiency, it is necessary to promptly supplement the corresponding nutrients.
Seven, spraying parts
The fertilizer should be sprayed on the young stems and leaves of the crop; the dicots should be sprayed as much as possible on the back; the monocots are sprayed on both sides, mainly on the front.
Eight, a reasonable mix
Spraying two or more kinds of fertilizers can improve fertilizer efficiency; mixing fertilizers and pesticides can improve work efficiency.
Note: It is not possible to mix basic and acidic fertilizers or pesticides that will react.
Nine, add active agent
Adding a small amount of active agent to the fertilizer can reduce the surface tension of the fertilizer solution, increase the contact area with the blade, and enhance the spraying effect.
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