The aim of this work was to evaluate the surface tension of water emulsion with mineral oils and vegetable oils used as adjuvant. The mineral and vegetable oils when added to the agrochemicals can improve any characteristics of the spray solution. The surface tension was evaluated in emulsion contend: mineral oils (Assist, Attach, Dytrol, Iharol, Mineral Oil, Spinner, Sunspray-E e Triona) and vegetable oils (Agrex'oil Vegetal, Crop Oil, Natur'l Óleo, Óleo Vegetal Nortox e Veget Oil). For each product were evaluated eleven concentrations. This property of the mineral oils and vegetable oils were evaluated with the weight of drops formed in the extremity of a burette. The data were adjusted to the Mitscherlich's Model. The mineral oils Assist, Dytrol, Iharol and Mineral Oil presented the smallest minimum surface tension, respectively, 29.255; 28.442; 26.097 and 28.584 mN m-1. The vegetal oils that presented the smallest values of minimum superficial tension were: Agrex' oil Vegetal (27.716 mN m-1), Natur'l Óleo (28.216 mN m-1), Veget Oil (27.308 mN m-1) and Crop Oil (29.964 mN m-1).
adjuvant; application technology; surface tension
