First, foliar topdressing can only be a kind of supplement, and it is necessary to apply the basic fertilizer and timely topdressing to achieve the desired effect.
Second, the concentration should be suitable. The concentration is too low, can not achieve the purpose of top dressing; too high, prone to fat or toxins.
Third, the application period and time should be reasonable. The whole growth period can be applied, but should avoid the full bloom period. It is usually carried out on sunny, late or cloudy days. It rains within 3 hours after spraying. It should be refilled after sunny days, but the concentration should be reduced.
Fourth, the fertilizer mixture should be reasonable. If two or more kinds of fertilizers are mixed reasonably, the yield increase effect is extremely significant. However, it cannot be mixed arbitrarily. For example, potassium dihydrogen phosphate cannot be mixed with rare earth; the filtered human urine cannot be mixed with the grass ash leaching solution. In addition, try not to mix with alkaline pesticides when performing foliar topdressing.
Huaxian Agricultural Technology Promotion Center Huang Lihua
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