Concentrated herbicide formulation, non-volatile, stable at low temperatures and soluble in water of 2,4-D acid ((2,4-dichlorophenoxy) acetic acid), characterized in that it includes: 45 to 75%, w/v of 2,4-D acid, in the form of a water soluble salt of a primary, secondary, or tertiary amine, or a primary, secondary, or tertiary alkanolamine, or a mixture of both; 1 to 40%, w/v of a humectant selected from a group made up of amine oxides, amide amine oxides, ethoxylated fatty amines, glycerin and its derivatives, sorbitol and its derivatives and polyethyleneglycol, and their mixtures; 0.1 to 20%, w/v of an antifreeze selected from a group made up of glycols; 0.01 to 0.5%, w/v of an antifoaming agent chosen from amongst silicon oil emulsions at 10-30%, surfactant agents based on hydrocarbons such as fatty acids and their salts in hydrocarbon, and alcohols with 8 or more carbon atoms, such as 2-ethylhexanol and isooctanol; optionally, 0.5-10%, w/v of a non-polar solvent; and the rest being water. 2,4-D is an herbicide selective for dicotyledons presented as soluble concentrates of this compound in the form of its alkaline or ammonium salts or its non-volatile amine or alkanolamine salts, or as emulsifiable concentrates of high or low volatility esters of 2,4-D acid. It has been confirmed that, concerning the penetration into the leaves, the esters of 2,4-D are more effective than the amines, although their herbicide effect is slower. On the contrary, the amines have a quicker herbicidal efficacy than the esters, but are less effective than the esters concerning ease of absorption on the leaves. Nevertheless, the amine salts have the advantage of not being volatile, thus eliminating the risks of the esters of deviating due to volatility, which may cause damage in sensitive nearby crops. Said formulations of 2,4-D acid, based on their amine salts, solve the problems presented by said salts as to their penetration power, by addition of specific coadjuvants which improve the performance of the active herbicide compound while also stabilizing said formulation at temperatures of −8±2° C.
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