In conventional cropping systems, mechanical techniques can be used in addition to herbicide applications to help optimize the control of problem weeds. They play a particularly large role in weed management in conventional systems where effective herbicide options are limited, such as in fields with severe multiple-herbicide resistant weed infestations, and in sensitive vegetable & fruit crops. In organic systems, mechanical practices become more heavily relied upon for weed control in the absence of herbicide options. Even in no-till systems, many mechanical techniques still play a valuable role in weed management.
Mechanical practices include tillage, cultivation, manual removal of weeds with hand tools, and other emerging, innovative technologies. For producers wishing to generally reduce herbicide use but still maintain weed control and yield, one option may be to band herbicides in combination with cultivation.
Producers using mechanical techniques should consider the timing and frequency of treatments that is best to control the specific weeds of concern. Also consider how they’ll fit in with other weed management practices happening on the field, as well as the effect they will have on the soil and overall farm management.
Resources and tips for catering these techniques to particular weed management problems are listed below.
Some examples of mechanical innovations include:
- Harrington Seed Destructor for harvest-time weed seed destruction
- Robotic weed control implements just beginning to emerge
- Chaff carts for removal of escaped weeds at harvest
- Finger weeders for in-row cultivation – most appropriate for high value crops in small acreage
- High-residue cultivation
A challenge to current perceptions: Would You Use Mechanical Cultivation for Weed Control? – American Agriculturist