Effect of addition of syrup glycerin as adjuvant for spraying in land use

Abstract

The application of pesticides is a practice that has deficiencies such as low efficiency, environmental contamination and losses on derivatives, runoff and evaporation. Thus, this study aimed to evaluate the behavior of glycerol as an adjuvant in the spray ground, comparing it with vegetable oil and water. The parameters evaluated were volume median diameter (VMD) droplet density (DD) and real potential for drift (RDP). The experiment was a completely randomized design with 15 treatments and 4 replicates in a 5x3 factorial design (5 compositions of spray and 3 volumes of application). The doses of adjuvant used were 2.0 and 2.5% (v/v) glycerin and vegetable oil. We used three spray volumes (100, 150 and 200 L ha^-1). The treatments with water + vegetable oil reduced the values of DD and RDP. VMD values were directly proportional to the volume of application. The addition of glycerol increased the DD. Glycerin can be used as an adjuvant, however, studies with lower concentrations should be developed in comparison with plant and mineral oil adjuvant.