Liquid aqueous formulations of water-soluble active crop protectant ingredients which comprise (a) one or more water-soluble active ingredients (type (a) ingredients), (b) if desired, one or more water-insoluble active ingredients (type (b) ingredients), (c) if desired, polar organic solvents, (d) anionic surfactants, (e) if desired, nonionic, cationic and/or zwitterioinic surfactants, (f) silicone-based defoamers from the group of the linear polydimethylsiloxanes having an average dynamic viscosity, measured at 25° C., in the range from 1000 to 8000 mPas, and containing silica, (g) if desired, other, customary formulation assistants, and (h) water are suitable as low-foam formulations for application in crop protection. Also possible is the use of the corresponding active-ingredient-free adjuvant formulations in a tank mix with or in split application with active-ingredient formulations.