The present invention relates to a method for preparing a tank mix, which comprises the step of contacting a pesticide formulation, water, and a tank mix adjuvant, wherein the pesticide is an anionic herbicide, and wherein the tank mix adjuvant comprises a base selected from a carbonate and/or a phosphate, and wherein the tank mix adjuvant is present in form of a particulate solid, which contains at least 80 wt.% of the base, and wherein the tank mix is an aqueous liquid, which contains at least 65 wt.% water and has a tank mix acidity of at least pH 8.0. The invention also relates to a tank mix adjuvant, which comprises an auxiliary and a base selected from a carbonate and/or a phosphate, wherein the tank mix adjuvant is present in form of a particulate solid, which contains at least 80 wt.% of the base, and wherein the auxiliary comprises an anti-foaming agent, binder, anti-drift agent, crystallization inhibitor, and/or separating agent; and to a method of controlling phytopathogenic fungi and/or undesired vegetation and/or undesired insect or mite attack and/or for regulating the growth of plants, wherein the tank mix, as defined above, is allowed to act on the respective pests, their environment or the plants to be protected from the respective pest, on the soil and/or on undesired plants and/or the crop plants and/or their environment.
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