NOVELTY - Agrochemical isotropic dispersion of at least two immiscible liquids, comprises: (a) at least one water soluble herbicidal salt; (b) a surfactant system comprising a sorbitan ester or its alkoxylate in combination with at least one vegetable oil alkoxylate; and (c) water, where the water soluble herbicide salt is partitioned between the microdomains of each the liquid.    USE - The isotropic dispersion is useful in an agrochemical microemulsion formulation for controlling an undesired weed at a location, where the microemulsion is an oil-in-water microemulsion (all claimed). The formulation is useful for controlling plant species e.g. Abutilon, Amaranthus, Artemisia, Asclepias, Avena, Axonopus, Borreria, Brachiaria, Brassica and Bromus.    ADVANTAGE - The formulation has improved chemical and physical stability and bioefficacy, and is eco-friendly.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) preparing the agrochemical isotropic dispersion of at least two immiscible liquids, comprising either (i) mixing a sorbitan ester or its alkoxylate with at least one vegetable oil alkoxylate under stirring to obtain a uniform mixture, (ii) mixing at least one water soluble herbicide salt and optionally mixing a predetermined quantity of at least one alkyl cellosolve co-solvent to the mixture of the step (i), and (iii) adding a predetermined quantity of a first liquid and a predetermined amount of a second liquid immiscible with the first added liquid to the solution of the step (ii), or (ia) mixing at least one water soluble herbicidal active ingredient with a predetermined quantity of an alkyl cellosolve in a first liquid, and (iia) adding an alkoxylated sorbitan ester and vegetable oil alkoxylate along with a second liquid i.e. immiscible with the first added liquid to the solution obtained in the step (ia) under stirring to obtain a clear formulation;    (2) an agrochemical microemulsion formulation comprising the isotropic dispersion; and    (3) controlling an undesired weed at a location, comprising applying the formulation at the desired location.