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64 POTATO GROWER | JANUARY 2022 RATE CONTROL GREENTRONICS.COM STORING– TRACKING – SHIPPING - TREATING IN-LINE SCALE INFO@GREENTRONICS.COM 519-669-4698 • Measures flow rate & controls pump • Provides variable rate seed treatment • Optimizes application rate • Reduces waste and labour • Allows for remote data access with cloud server option 4096-13Greentronics12h.indd 1 4096-13Greentronics12h.indd 1 11/19/21 11:05 AM 11/19/21 11:05 AM potatoes. The process to avoid herbicide carryover damage to your potatoes is incorporated into each herbicide decision for all rotation crops. Also, accurate records involving herbicide applications are an important step in maintaining a smooth, trouble-free rotation that will help to maximize yields for every crop in the rotation. • Cultural Practices Appropriate and properly timed tillage (especially in the fall) can play a major role in reducing the persistence of herbicides in the soil. Tillage can help "dilute" herbicides concentrated in the topsoil through mixing with herbicide-free soils from below. However, highly soluble herbicides likely to leach into the subsoil could be brought back up to the surface with a complete inversion by plowing. • Bioassay If herbicide application records in the previous year(s) are not known, or if conditions were not conducive enough for herbicide breakdown and safe plant-back, a bioassay is recommended to determine whether the field is safe to plant to potatoes. A bioassay in this case means planting potatoes, or another crop sensitive to the herbicide, in the soil that was treated with that herbicide. An indoor or greenhouse bioassay conducted the fall/winter after use of the herbicide would speed up assessment time and provide enough information to allow for planting potatoes in the spring without the likelihood of herbicide injury. The one issue with using seed potatoes in the bioassay is that they may still be dormant or slow to sprout and emerge. This could delay results or mask some herbicide damage. If you would like to conduct a bioassay, contact your area extension specialist or agronomist to find out the steps to follow. • Laboratory Analysis Instead of or in addition to a bioassay, soil from the field can be collected and sent to a lab for herbicide residue analyses. Follow the laboratory's guidelines for sample collection and submission, as it can differ depending on the potential herbicide applied. It is helpful to know the herbicide Clopyralid (Stinger) damage on potatoes