Detailed Explanation of Field Management Techniques for Corn at the Large Bell Mouth Stage

The large bell mouth stage of corn is a critical period of growth and development, a stage in which vegetative growth and reproductive growth proceed together. To ensure high and stable corn yields, the following key management techniques must be carried out well:

1. Scientific topdressing. The large bell mouth stage is the period when corn has the greatest demand for fertilizer and the highest fertilizer requirement intensity in its entire life cycle. At this time, farmers should be guided to apply topdressing generally according to soil fertility and seedling condition, applying 20-30 kg of urea per mu, and covering with soil after fertilization.

2. Intertillage and hilling. Intertillage can improve soil permeability, thicken the soil layer at the base of the plants, promote root growth, and prevent plant lodging. At the same time, removing weeds helps store water and conserve soil moisture.

3. Timely watering. The large bell mouth stage of corn is a critical period for water demand. Watering after fertilization can change the field microclimate, which is conducive to corn pollination and increases the seed-setting rate of the ears.

4. Pest and disease control. During this period, fields should be inspected at any time to check for the occurrence of pests and diseases. If corn borers are found, use 1.5% phoxim-based borer granules applied to the whorl, with a dosage of 0.5 kg per mu, which gives a relatively good control effect. At the same time, attention should also be paid to checking for armyworms and aphids, and corn leaf blights, both large and small, as well as rust disease should also be checked frequently and controlled early.