the micellar system this effect of hydrotropy differs from the solubilization properties of surfactants which results in a third hydrophobic material being enclosed in a microstructure such as micelle or microemulsion the whole thing being dispersed in water the chemical which increases the solubility of a hydrophobic material is called a solubilizer or coupling agent and it is generally referred to as a surfactant many chemicals have been called fertilizer compatibility agents examples of common fertilizer compatibility agents include phosphate esters alkylpolyglycosides nonionic nonylphenol ethoxylates and the like specifically they prevent the diluted pesticide emulsion from separating out in the presence of fertilizer and another herbicide it is an objective of the present invention to increase the aqueous solubility of non amine salts of phenoxy acid herbicides examples of phenoxy acid herbicides referred to in the present invention include but are not limited to the following although it is believed that the present invention is useful for all of the phenoxy herbicides known to the skilled artisan including those mentioned above the present inventors will focus this description on 2 4 d acid and its salts because it is by far the phenoxy herbicide having the widest application and use increasing the solubility of the 2 4 d non amine salts differs from increasing the solubility of an ethoxylated product through a hydrotropy effect it also differs from increasing the solubility of an oily product through a solubilization.