tankmix

A tank mix, or tankmix, refers to the practice of combining two or more agricultural chemical products in a single spray tank prior to application to crops. It is used to improve efficiency, broaden the spectrum of control, reduce field passes, and lower fuel and labor costs. Tank mixes are common in crop protection programs, including combinations of herbicides, fungicides, insecticides, and, in some cases, adjuvants or micronutrient products.

Compatibility considerations are central to tank mixes. Physical compatibility deals with how ingredients interact in water—whether they stay suspended, emulsify, or separate into layers. Chemical compatibility concerns pH, water hardness, salt content, and potential chemical reactions that can reduce efficacy or cause crop injury. Not all products can be mixed, and some combinations can antagonize performance, cause phytotoxicity, or create residues that violate label instructions.

Best practices include consulting the labels for each product to determine whether a tank mix is allowed, and following any specific mixing instructions or order of addition. Prior to field use, perform a jar test or other compatibility testing to detect precipitation, separation, foaming, or other issues. Use appropriate water quality and maintain agitation during mixing and spraying. Adhere to labeled rates and restrictions, and consider potential effects on crop safety, beneficial organisms, and the environment. Include records of the tank mix for future reference and compliance.

Operational considerations also cover the addition of adjuvants or surfactants only as allowed by the labels, maintaining proper spray volume and nozzle performance, and avoiding tank mixes that could increase drift or volatility under local conditions. If compatibility is uncertain, sequential applications may be advisable.

Regulatory and safety aspects require compliance with product labels and local regulations; improper tank mixing can lead to crop injury, reduced effectiveness, or legal penalties.