CORN AND SOYBEAN OBJECTIVE YIELD RESULTS
The Illinois
Agricultural Statistics Service conducts corn and soybean objective yield surveys
each year. Randomly selected plots in corn for grain and soybean fields are
visited monthly from August through harvest to obtain specific counts and measurements.
Data in these tables are based on survey results but are not official estimates.
They are intended to show trends in corn for grain and soybean production practices.
CORN FOR GRAIN: Percentage distribution
by row width and average row width, Illinois 1989-1998
| Year |
Number
of samples |
Row
width (inches) |
Average
row width |
| 30.5
& less |
30.6
- 34.5 |
34.6
- 36.5 |
36.6
- 38.5 |
38.6
& greater |
| |
Percent
|
| 1989 |
230 |
53.9 |
11.8 |
13.5 |
17.4 |
3.4 |
32.6 |
| 1990 |
236 |
49.2 |
16.5 |
14.8 |
17.0 |
2.5 |
32.5 |
| 1991 |
235 |
54.9 |
16.6 |
11.5 |
13.2 |
3.8 |
32.2 |
| 1992 |
233 |
57.9 |
13.3 |
14.2 |
13.7 |
0.9 |
32.0 |
| 1993 |
244 |
50.8 |
17.2 |
13.1 |
15.2 |
3.7 |
32.4 |
| 1994 |
241 |
52.3 |
21.6 |
9.1 |
11.6 |
5.4 |
32.1 |
| 1995 |
268 |
56.7 |
19.4 |
10.5 |
12.3 |
1.1 |
31.9 |
| 1996 |
257 |
63.4 |
14.4 |
10.9 |
9.3 |
2.0 |
31.7 |
| 1997 |
270 |
61.4 |
17.8 |
11.9 |
7.4 |
1.5 |
31.6 |
| 1998 |
267 |
64.5 |
14.6 |
9.7 |
10.5 |
0.7 |
31.5 |
CORN FOR GRAIN: Plant population
and ears per acre, Illinois, 1989-98
| Year |
Plant population |
Ears per
acre |
| 1989 |
21,900 |
21,000 |
| 1990 |
22,300 |
21,900 |
| 1991 |
23,700 |
21,800 |
| 1992 |
23,000 |
23,000 |
| 1993 |
23,300 |
22,600 |
| 1994 |
23,200 |
22,600 |
| 1995 |
23,650 |
22,850 |
| 1996 |
24,200 |
23,600 |
| 1997 |
24,900 |
23,400 |
| 1998 |
25,400 |
24,300 |
SOYBEANS: Percentage distribution
by row width and average row width, Illinois, 1989-98
| Year |
Number
of samples |
Row
width (inches) |
Average
row width |
Pods
per 18 sq. feet |
| 10.0
and less |
10.1
- 18.5 |
18.6
- 28.5 |
28.6
- 34.5 |
34.6
and greater |
| |
Percent
|
| 1989 |
178 |
18.8 |
5.9 |
3.7 |
48.6 |
23.0 |
26.6 |
1,385 |
| 1990 |
175 |
25.4 |
6.0 |
4.0 |
46.9 |
17.7 |
25.5 |
1,460 |
| 1991 |
196 |
23.6 |
9.2 |
3.3 |
48.7 |
15.2 |
24.6 |
1,450 |
| 1992 |
176 |
33.5 |
7.4 |
6.3 |
41.1 |
11.7 |
22.0 |
1,502 |
| 1993 |
179 |
38.0 |
6.7 |
3.9 |
40.8 |
10.6 |
21.2 |
1,701 |
| 1994 |
185 |
45.6 |
11.4 |
3.0 |
34.6 |
5.4 |
18.4 |
1,636 |
| 1995 |
208 |
57.1 |
10.1 |
2.9 |
26.0 |
3.9 |
16.0 |
1,764 |
| 1996 |
202 |
53.2 |
15.2 |
2.2 |
25.5 |
3.9 |
16.0 |
1,581 |
| 1997 |
211 |
55.2 |
18.5 |
3.1 |
21.1 |
2.1 |
15.1 |
1,708 |
| 1998 |
205 |
54.5 |
17.8 |
2.0 |
22.0 |
3.7 |
15.5 |
1,906 |
Illinois Agricultural Statistics Service
Annual Summary - 1999 |
Page 52 |
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