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Estimating Corn Yields
This procedure is based on information used in developing the "Corn Yield Calculator" slide rule published by the University of Illinois:
1. Count number of ears in 1/1,000 acre:
| Row Width (inches) | Length Equal to 1/1,000/a |
| 20" | 26'1" |
| 28" | 18'8" |
| 30" | 17'5" |
| 36" | 14'6" |
| 40" | 13'1" |
2. At the same site, select 3 representative ears and count the number of rows of kernels and the number of kernels per row for each ear. Do not count tip kernels that are less than half-size.
3. Estimate the yield for EACH of the 3 ears as follows: (Number of ears in 1/1,000 A) x (number of kernel rows) x (number of kernels per row) x 0.01116 = bushels per acre at 15.5% moisture.
4. Average the yield estimates from the 3 ears.
5. Repeat steps 1-4 at several sites and average the results to estimate grain yield for the entire field.
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