Corn development continues to vary throughout the county. After tasseling the next growth stage is R1 – Silking.
R1 – Silking.
- At least 50% of plants in the field will have 1 or more silks emerged. Look at only the uppermost ear on the corn plant.
- Pollen grains will land on silks and if receptive, fertilization will occur.
- Silks are viable and receptive to pollen for at least 5 days.
- The plant uses the most water per day (0.35 inches) during R1, making it very sensitive to stresses.
- The largest yield reduction occurs with stress at silking
- Silks have highest water content among all parts of the corn plant.
- Drought causes silk elongation to slow down and pollen shed to speed up.
- Potential kernel number is determined.
- Maximum plant height is achieved.
- Potassium uptake is essentially complete and nitrogen and phosphorus uptake is rapid in the plant.
- Nutrient content by leaf analysis is highly related to the final grain yield at this time.
R3 Beginning Pod
- A plant can have all of the following:
developing pods, withering flowers, new open flowers and flower buds
- Potassium uptake rates peak shortly
after R2, ranging between 3.5-5.2 lb K2O /acre/day
- Last growth stage to treat for white mold
- Scout for insects and diseases. Spray foliar insecticide or fungicide, if needed.
- Identify water stress,
which affects pod formation.
County Rainfall Update