Avaliação da deposição de gotas em pulverização utilizando-se de diferentes adjuvantes

Abstract

The work verified the interference of the use of adjuvant, including an alternative product in the deposition of pockets and the efficiency of the cover. It was conducted without Agricultural Machines and Mechanization Laboratory of the Federal University of Mato Grosso, Sinop Campus, using a 600L agricultural tractor and sprayer Equipped with flat and conical jet tips (110 02). Two commercial adjuvants, in two doses each (according to package insert), and an alternative product containing anionic surfactant (surface tension reducer) in four doses, and the control composed only of water were evaluated. A slurry volume of 120 L ha-1was used to obtain the deposition, water-sensitive papers positioned 0.5 m below the application bar were placed in each of the 4 sections of the sprayer. The parameters were: volumetric diameter of droplets, numerical median diameter, relative amplitude, droplet density and coverage. The results obtained were the coverage rate varied from 20.56 to 23.95%, the relative amplitude showed a percentage with values between 0.88 to 1.12; the droplet density ranged from 136 to 296 cm-2 drops, the mean volume diameter of the treatments ranged from 150 to 195 μm. The number median diameter ranged from 385 to 524 μm. The alternative product, in some parameters, pointed out surprising responses in some of its doses with respect to the quality of drops. Aureo was the treatment that gave the best response to the others, with an expressive coefficient of homogenization (CH).