What is tank-mix compatibility, and how can you assess it for seed treatments?

• A. Compatibility between two or more pesticides or adjuvants; test with a jar test or label guidelines before mixing.
• B. Compatibility of seed color with packaging; assess by visual inspection.
• C. Compatibility of planter speed with seed flow; assess by trial runs.
• D. Compatibility of moisture with seeds; assess by moisture meter.

Answer: (A)

Tank-mix compatibility is about whether two or more pesticides or adjuvants can be mixed in the same tank and applied together without the mixture causing problems, such as separation, precipitation, foaming, clogging, reduced efficacy, or harm to seeds. For seed treatments, this means the combined products should stay evenly distributed on the seed and not interfere with germination or seed safety.

To assess compatibility, use a jar test: mix the exact products in the same proportions and in the same order you would use in the tank, with the same type of water, and agitate as you would in operation. Check immediately and again after about 24 hours for signs like separation, color or viscosity changes, clumps, precipitation, emulsion break, or excessive foaming. If any instability or adverse change appears, do not mix those products. Always consult the label for compatibility statements and any required mixing instructions or compatible adjuvants. When in doubt, start with a small test and, if needed, adjust or separate applications to avoid seed damage or reduced performance.