2. Do deep fertilization. Corn topdressing must be done in depth, otherwise it will reduce fertilizer utilization. The most suitable depth is 5 to 10 cm, and the soil is covered in time.
3. Look at the long-term topdressing. In the case of seedlings, the seedlings and weak seedlings should be treated differently when topdressing. Weak seedlings should be properly topdressed early. If necessary, foliar fertilizer can be sprayed separately to promote the early development of weak seedlings;
4. Appropriate amount of potassium fertilizer. When the amount of potassium applied in the base fertilizer is insufficient, an appropriate amount of potassium fertilizer may be applied to make up for the deficiency of potassium.
5. Rational application of foliar fertilizer. The number of foliar sprays, the spraying period and the solution concentration should be strictly in accordance with the product instructions. Spraying time should be selected before 10:00 am or after 3 pm, or you can choose to spray on cloudy days to avoid high temperature and direct sunlight; evenly spray on the back of the blade to make the droplets not drip; In case of heavy rain within 3 hours after spraying, it should be re-sprayed; foliar fertilizer should not be sprayed with pesticides as much as possible.
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