EFEITO RESIDUAL ATIVO DE HERBICIDAS (carryover) EM PLANTAS DE TOMATE INDUSTRIAL

Abstract

The tomatoes (Solanum lycopersicum L.) cultivation has its economic importance in Brazilian territory for being cultivated in different states, which one the largest representative is Goiás, followed by São Paulo and Minas Gerais, characterizing it as one of the most consumed and produced vegetables in Brazil, being used in human food, either in natura or industrially processed. To maximize land use, the succession of crops in the same area has become quite common, making it necessary to apply different herbicides. Even though the application is used in previous crops, there may be negative effects on tomatoes through an effect called carryover. The present work evaluated the carryover effect of herbicides with the active principle of atrazine, mesotrione and tembotrione applied to the previous crop, sweet corn, whose treatments and doses were respectively: T1: manual weeding (without herbicide application); T2: Calaris®, 1.5 L ha-1 (atrazine+mesotrione); T3: Primóleo®, 5.0 L ha-1 (atrazine); T4 Primóleo® (atrazine), 5.0 L ha-1 + Callisto® (mesotrione), 0.25 L ha-1 and T5: Primóleo® (atrazine) 5.0 L h-1 + Soberan® (tembotrione), 0.24 L ha-1, applied at the V5 stage. Plants treated with Primóleo® + Callisto® at a dose of 5.0 L ha-1 + 0.25 L ha-1 (T4), obtained a greater increase in fruit density, 1.027 d cm-3, dry matter content and carotenoids, 74.69 g, 44.175 μg cm -2, and for the treatment of Calaris® at a dose of 1.5 L ha-1 (T2), there was an increase in the chlorophyll a content, being 104. 57 μg cm -2. Regarding defects, classification and productivity, no statistical difference was obtained between treatments. The application of atrazine+mesotrione did not generate a carryover effect in tomato.

Keywords: Weeds; transfer; sucession; herbicides.