Aplicação aérea de Imazapyr + Imazapic no controle de arroz-vermelho e análise da densidade de gotas.

Abstract

The efficiency of weed control in irrigated rice when herbicides are applied via airplane can vary depending on application conditions, such as the type of spray equipment, the volume of herbicide solution and the use of adjuvants. The objective of the work was to evaluate the control of red rice in irrigated rice field of the cultivar Puita INTA CL with the formulated mixture of imazapyr + imazapic, with the addition of adjuvants and different aerial application equipments, being performed an analysis of production costs. It was also verified the pulverized droplet density and were compared three methods of analysis of the density of it. The experiment was conducted in the design of fullyrandom plots with six treatments, five replicates of five interspersed witnesses. The treatments were fan shape impact nozzle, calibrated with application volume of 20L ha-1, rotary disk atomizer with application volume of 10L ha-1 combined with the use of adjuvants Dash®, Assist® and an association of Assist® with silicon surfactant spreader Break Thru®, more witness without application of herbicides. The results allow to conclude that the herbicide compound formulated mixture of imazapyr + imazapic effectively controls red rice regardless of the type of adjuvant and application equipment used and increases productivity by 1,028t ha-1. The droplet density observed is greater with the use of rotary atomizers with 10L ha-1 when compared with the hydraulic nozzles with 20L ha-1. The evaluated methods for the determination of droplet density (magnifying glass, scanning and image) do not differ among themselves.