YIELD
REDUCTION FROM WEEDS IN SOYBEANS
|
%
Soybean Yield Loss |
|
1 |
2 |
4 |
6 |
8 |
10 |
| Weed Species |
(#
weeds or clumps/100 ft2) |
| Giant
ragweed |
0.1 |
0.2 |
0.4 |
0.5 |
0.8 |
1 |
| Cocklebur |
0.4 |
0.8 |
1.6 |
2.4 |
3.2 |
4 |
| J. artichoke |
0.4 |
0.8 |
1.6 |
2.4 |
3.2 |
4 |
| Pigweeds |
0.8 |
1.6 |
2.4 |
4 |
6 |
8 |
| Lambsquarters |
0.8 |
1.6 |
2.4 |
4 |
6 |
8 |
| Velvetleaf |
3.2 |
6.4 |
9.6 |
12.8 |
16 |
20 |
| Morningglory |
3.2 |
6.4 |
9.6 |
12.8 |
16 |
20 |
| Jimsonweed |
3.2 |
6.4 |
9.6 |
12.8 |
16 |
20 |
| Pennsylvania
smartweed |
3.2 |
6.4 |
9.6 |
12.8 |
16 |
20 |
| Giant
foxtail* |
2 |
4 |
6.8 |
10 |
12.8 |
17.6 |
| Shattercane** |
0.8 |
2 |
3.2 |
4.4 |
5.6 |
7.2 |
| Volunteer
corn |
0.4 |
0.8 |
1.2 |
1.6 |
2 |
2.4 |
|
* 5 to 8 foxtail stems per clump |
| **
2 to 3 shattercane stems per clump |
Corn,
Soybean, Wheat, and Alfalfa Field GuideBulletin 827