To estimate crop yield, identify the following characteristics:
- Plant Population
- Head Diameter
- Seed Size Category
- Good Seed Set
- Center Seed Set
Yield is calculated by multiplying 2450 by the multipliers from the charts below.
For example: A plot with a stand of 19,000, a head size of 7.5 inches, a seed size
of light medium, good seed count of 85% and no seed in the center 2".
Yield calculations for this plot would be: 2450 x .95 x .91 x .9 x .85
x .95 = 1539.3 lbs/acre
MULTIPLIERS
Plant population - Step off a 10 ft. section at least 50 ft from end rows.
Plants per 10 ft. of row
| 1.6 |
3.2 |
4.8 |
5.9 |
7.5 |
8.0 |
9.5 |
.70 |
| 1.7 |
3.4 |
5.2 |
6.3 |
8.0 |
8.5 |
10.25 |
.75 |
| 1.8 |
3.7 |
5.5 |
6.7 |
8.5 |
9.25 |
11.0 |
.80 |
| 2.0 |
3.9 |
5.9 |
7.1 |
9.0 |
9.75 |
11.75 |
.85 |
| 2.1 |
4.1 |
6.2 |
7.6 |
9.5 |
10.5 |
12.5 |
.90 |
| 2.2 |
4.4 |
6.5 |
8.0 |
10.0 |
11.0 |
13.0 |
.95 |
| 2.3 |
4.6 |
6.9 |
8.4 |
10.75 |
11.5 |
13.75 |
1.00 |
| 2.4 |
4.8 |
7.2 |
8.8 |
11.25 |
12.0 |
14.5 |
1.05 |
| 2.5 |
5.1 |
7.6 |
9.2 |
11.75 |
12.5 |
15.25 |
1.10 |
| 2.6 |
5.3 |
7.9 |
9.6 |
12.25 |
13.25 |
15.75 |
1.15 |
| 2.8 |
5.5 |
8.3 |
10.1 |
13.0 |
13.75 |
16.5 |
1.20 |
| 2.9 |
5.7 |
8.6 |
10.5 |
13.5 |
14.25 |
17.25 |
1.25 |
| 3.0 |
6.0 |
9.0 |
10.9 |
14.0 |
15.0 |
18.0 |
1.30 |
|
An alternate method is to measure a 5' x 10' square and count all the plants
within the square. This method can be used for all row spacings.
| 14,000 |
16 |
.70 |
| 15,000 |
17 |
.75 |
| 16,000 |
18.5 |
.80 |
| 17,000 |
19.5 |
.85 |
| 18,000 |
21 |
.90 |
| 19,000 |
22 |
.95 |
| 20,000 |
23 |
1.00 |
| 21,000 |
24 |
1.05 |
| 22,000 |
25 |
1.10 |
| 23,000 |
26 |
1.15 |
| 24,000 |
27.5 |
1.20 |
| 25,000 |
29 |
1.25 |
| 26,000 |
30 |
1.30 |
| 27,000 |
31 |
1.35 |
| 28,000 |
32 |
1.40 |
| 29,000 |
33 |
1.45 |
| 30,000 |
34 |
1.50 |
| 31,000 |
35.5 |
1.55 |
| 32,000 |
37 |
1.60 |
|
Head Diameter - Measure the diameter of an average head.
| 4.5 |
.37 |
| 5.0 |
.46 |
| 5.5 |
.55 |
| 6.0 |
.64 |
| 6.5 |
.73 |
| 7.0 |
.82 |
| 7.5 |
.91 |
| 8.0 |
1.00 |
| 8.5 |
1.09 |
| 9.0 |
1.18 |
| 9.5 |
1.27 |
| 10.0 |
1.36 |
| 10.5 |
1.45 |
| 11.0 |
1.54 |
|
