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ProCrop |
Mechanical Weed
Control with Harrow or Rotary Hoe
January 1997
D. Klinkebiel and G. Endres, NDSU Carrington Research Ext. Center
General Recommendations for harrow or rotary hoe use* |
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| Crop Species | Crop Stage |
|
| Pre-emergence | Post-emergence | |
| Amaranth | Up to 3-5 days after germination; shallow tillage depth | Not recommended |
| Barley** | Before coleoptile near soil surface | 1-3 leaf stage |
| Buckwheat | Up to 3-5 days after germination | Stand reduction will occur |
| Canola | Up to 3-5 days after germination; shallow tillage depth | Not recommended |
| Chickpea (Garbanzo bean)** | Up to 3-5 days after germination | Up to 2-4 inches tall |
| Corn** | Up to and including emergence | Emergence to 8 inches tall |
| Crambe | Up to 3-5 days after germination; shallow tillage depth | Not recommended |
| Dry Bean | Before crook stage | 1-2 trifoliolate stage |
| Fababean** | Up to 3-5 days after germination | 2-6 inches tall |
| Field Pea** | Up to 3-5 days after germination; shallow tillage depth | Stand reduction will occur |
| Lentil* | Up to 3-5 days after germination | 1-4 inches tall; Stand reduction |
| Lupin | Up to and including emergence | Emergence 2-4 inches tall |
| Mustard | Up to 3-5 days after germination; shallow tillage depth | No recommended |
| Oats** | Before coleoptile near soil surface | Not recommended |
| Proso Millet** | Up to 3-5 days after germination; shallow tillage depth | Stand reduction will occur |
| Grain Sorghum** | Before coleoptile near soil surface | Emergence to 8 inches tall |
| Soybean | Before crook stage | 1-2 trifoliolate stage |
| Sunflower | Up to 3-5 days after germination | 2-6 leaf stage |
| Wheat** | Before coleoptile near soil surface | 1-3 leaf stage |
* Timing of tillage may vary depending on environment and equipment. Planting rate should be 5-15 percent above normal to compensate for potential stand loss. Plants should be limp or less turgid (with dry, warm, and sunny conditions) to reduce damage. Chickpea, dry bean, fababean, field pea, lentil, lupin, soybean, and sunflower plants should be dry before tillage to reduce spread of disease.
** Regrowth should occur if aboveground stem severely damaged or removed.
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