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Table 23. Estimated
Impact of Weed Density on Corn and Soybean Yield (Empirical Estimates Based on North
Central Regional Data and |
| Effect of increasing weed denisty on corn grain yield | ||||||||
| Ranking | % loss in grain yield | |||||||
| 0 | 1 | 2 | 4 | 6 | 8 | 10 | >10 | |
| weeds per 100 feet of crop row | ||||||||
| v. high | <2 | 2-4 | 5-8 | 9-16 | 17-30 | 31-36 | 37-40 | >40 |
| high | <4 | 4-8 | 9-16 | 17-32 | 33-60 | 61-72 | 73-80 | >80 |
| med. | >8 | 8-16 | 17-32 | 33-64 | 65-120 | 121-144 | 145-160 | >160 |
| low | <16 | 16-32 | 33-64 | 65-128 | 129-240 | 241-288 | 289-320 | >320 |
| Effect of increasing weed denisty on soybean grain yield | ||||||||
| Ranking | % loss in grain yield | |||||||
| 0 | 1 | 2 | 4 | 6 | 8 | 10 | >10 | |
| weeds per 100 feet of crop row | ||||||||
| v. high | 0 | 0.5-1 | 2 | 3 | 4 | 5 | 6 | >6 |
| high | 0 | 2-3 | 4-5 | 6-9 | 10-12 | 13-15 | 16-20 | >20 |
| med. | 1 | 2-6 | 7-12 | 13-20 | 21-30 | 31-40 | 41-50 | >50 |
| low | <4 | 4-12 | 13-20 | 21-30 | 31-50 | 51-75 | 76-150 | >150 |
| v.low | <8 | 8-20 | 21-30 | 31-75 | 76-125 | 126-200 | 201-300 | >300 |
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