Which type of adjuvant is used to improve mixing in a pesticide solution?

Compatibility agents are specifically designed to improve the mixing of pesticides in a solution. When pesticides are prepared for application, they may contain various ingredients that can sometimes react poorly with each other, leading to separation or precipitation. Compatibility agents help to stabilize these mixtures by preventing or reducing such adverse reactions, ensuring that the pesticide can be applied effectively.

In the context of the other options, colorants are primarily used for identification and visibility, allowing applicators to see where the product has been applied. Stickers are intended to enhance adherence of the pesticide to plant surfaces, increasing efficacy by preventing wash-off or evaporation. Humectants, on the other hand, retain moisture in the mixture, but do not directly influence mixing compatibility. Therefore, while all these adjuvants have important roles in pesticide applications, compatibility agents are uniquely positioned to address mixing issues.