A deriva de glyphosate interfere no desenvolvimento e produtividade de arroz irrigado

The objective of this research was to evaluate the injury to the development and yield of early cycle flooded rice cultivar (IRGA 430), caused by simulated glyphosate drift. The experiment was carried out in the field at the Experimental Station of the Rice - IRGA, in the 2016/17 season, and treatments were arranged in factorial scheme 3x2+1 whose factor A consisted of the glyphosate drift simulation with rates of 135; 270 and 540g ha-1 a.e.; the factor B of two nitrogen (N) rates, being 90 and 121.5 kg ha-1 N; more control without application of glyphosate and with the application of 90 kg ha-1 N. There increase in glyphosate rate results in higher injuries to the crop, with phytotoxicity symptoms, less panicles per area, and about 60% yield loss. The period of emergency until the anthesis (R4) was prolonged. The glyphosate simulated drift shows higher phytotoxicity, lesser plant height and increase development cycle, promoting negative interference on flooded rice yield.