CROP AND SOIL SCIENCES
Cover Crops and Conservation Tillage for Soil Erosion Control on Cropland
| Weeds | Treatment no. from Tables 9-7, 9-8 | |||||
|---|---|---|---|---|---|---|
| 23 | 24, 25 | 26 | 27² | 28² | 29 | |
| Crownvetch | 9 | 9 | 8 | 9+ | 6 | 9 |
| Birdsfoot trefoil | ? | 5 | 5 | 9 | 6 | N |
| Summer annuals | ||||||
| Black medic | ? | 7 | ? | 10 | 9 | 5 |
| Buckwheat, wild | 8 | 8 | 9 | 9 | 9 | 6 |
| Burcucumber | ? | 5 | N | 9 | 5 | 5 |
| Carpetweed | ? | 9 | 9 | 10 | 9 | 9 |
| Chamomile, mayweed | ? | 5 | N | 10 | 9 | 6 |
| Fleabane, annual | ? | 8 | ? | 10 | 9 | 7 |
| Foxtail, giant | N | N | N | 10 | 8 | N |
| Foxtail, giant green | N | N | N | 10 | 8 | N |
| Foxtail, green | N | N | N | 10 | 8 | N |
| Foxtail, yellow | N | N | N | 10 | 8 | N |
| Ladysthumb | 9 | 6 | 9 | 10 | 9 | 6 |
| Lambsquarters, common | 9 | 9 | 9 | 10 | 9 | 8+ |
| Morningglory, tall | ? | 9 | 8 | 10 | 9 | 9 |
| Mustard, wild | 9 | 10 | 9 | 10 | 9 | 10 |
| Pigweed, redroot | 9 | 9 | 7 | 10 | 9 | 8+ |
| Pigweed, smooth | 9 | 9 | 7 | 10 | 9 | 8+ |
| Pigweed, tumble | 9 | 9 | 7 | 10 | 9 | 8+ |
| Radish, wild | 9 | 7 | 6 | 9+ | 9 | 7 |
| Ragweed, common | 6 | 9 | 8+ | 10 | 9 | 9 |
| Smartweed, Pennsylvania | 9 | 6 | 9 | 10 | 9 | 6 |
| Speedwells | ? | 5 | ? | 10 | 9 | 5 |
| Velvetleaf | 9 | 8+ | 8 | 10 | 9 | 9 |
| Witchgrass | N | N | N | 10 | 8 | N |
| Winter annuals | ||||||
| Brome, downy | N | N | N | 10 | - | N |
| Brome, Japanese | N | N | N | 10 | - | N |
| Cheat | N | N | N | 10 | - | N |
| Chickweed, common | 9 | 5 | 6 | 10 | 10 | 5 |
| Corn cockle | ? | N | ? | 10 | 9 | ? |
| Deadnettle, purple | 9 | 5 | 7 | 10 | - | 5 |
| Fleabane, rough | ? | 7 | ? | 10 | 8 | 8 |
| Henbit | 9 | 5 | 8 | 10 | - | 6 |
| Horseweed | 7 | 8+ | 7 | 10 | 9 | 8 |
| Lettuce, prickly | 8 | 9 | 6 | 10 | 9 | 8 |
| Mustard, birdsrape | 9 | 5 | ? | 9 | ? | 8 |
| Pennycress, field | 9 | 9 | 8 | 10 | - | 9 |
| Pepperweed, field | 9 | 9 | 8 | 10 | - | 9 |
| Shepherd’s purse | 9 | 9 | 8 | 10 | - | 9 |
| Biennials | ||||||
| Thistle, plumeless | ? | 6 | N | 9 | 5 | 5 |
| Rocket, yellow | 9 | 8 | 7 | 10 | 9 | 8 |
| Perennials | ||||||
| Bindweed, field and hedge | ? | N | N | 8+ | 9* | 5 |
| Dandelion | 6 | 8 | 5 | 7 | 9* | 8 |
| Dock, broadleaf and curly | 8+ | 6 | 5 | 8 | 9* | 5 |
| Garlic, wild | 9 | 6 | N | 7 | 8* | N |
| Groundcherry | ? | 5 | N | 8 | 9* | N |
| Healall | ? | 5 | N | 9 | 9* | N |
| Johnsongrass | N | N | N | 9 | 9* | N |
| Milkweed, common | ? | N | N | 5 | 9* | N |
| Onion, wild | 9 | 6 | N | 7 | 8* | N |
| Pokeweed, common | ? | N | N | 8 | 8* | N |
| Quackgrass | N | N | N | 8 | 9* | N |
| Thistle, Canada | 8 | 6 | 5 | 7 | 9* | N |
| ¹ 10 = 95–100%, 9 = 85–95%, 8 = 70–85%, 7 = 65–75%, 6 = 55–65%, 5 = less than 55%, N = No control, ? = unknown, - not present. Above ratings are for average conditions; results may differ with variations in weed size, temperature, rainfall, soil moisture, soil type, and soil pH. ² Effectiveness on emerged weeds only; no residual weed control from paraquat alone. * Top kill only. |
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