Taking Stand Counts
- Take several sample counts to represent the field.
- Sample a length of row equal to 1/1000th of an acre.
- Measure off the distance appropriate for your row width, count the number of live plants and multiply by 1,000 to obtain an estimate of plants/acre.
Other Factors to Evaluate
- Stand uniformity - An uneven stand will yield less than a relatively even stand with the same number of plants.
- Plant health - Plants that are severely injured or defoliated will have reduced photosynthetic capability and a lower yield potential.
Corn yield is influenced by stand density as well as stand uniformity:
- Variation in plant size can have a negative impact on yield
- Uneven emergence timing leads to uneven plant size
Several Factors That May Lead To Uneven Emergence:
- Variation in soil moisture
- Poor seed- to- soil contact due to working or planting into wet soil
- Variation in soil temperature caused by uneven crop residue distribution
- Soil crusting
- Insects or disease
Impact of Uneven Emergence on Yield