Agrochemical adjuvant containing 2-oxo-1,3-dioxolan-4 carboxylates 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 which comprises a carbonate of the formula (I); to a pesticide formulation comprising the tank mix adjuvant; 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 or the pesticide formulation 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; and to a use of the tank mix adjuvant for increasing the efficacy of a pesticide.