TOLERÂNCIA DE GIRASSOL SUBMETIDO À DOSES DE FLUMETSULAM+METOLACHLOR

Abstract

The objective of the work was to evaluate the effect of doses of the herbicide flumetsulam+metolachlor on the development of the sunflower hybrid Tera204CL. The experiment was carried out in the field, at the Instituto Federal Goiano Campus Urutaí. The sunflower hybrid Tera204CL was evaluated and subjected to five doses of flumetsulam+metolachlor (0, 25, 50, 75 and 100% of the commercial dose) applied at 7, 14, 21 and 28 days after sowing. The conduction was in a randomized block design with four replications. Plant tolerance was assessed through phytotoxicity symptoms at 7, 14, 21 and 28 days after application (DAA). At 28 DAA, dry shoot matter (DSM) was also evaluated. The data were subjected to analysis of variance, followed by regression analysis (α=5%). The results indicate that all plants recovered from phytotoxicity at 28 DAA, allowing the use of the herbicide mixture in the sunflower crop. DSM fluctuated after herbicide application and the highest DSM was observed when applied 100% of the commercial dose (800 ml ha-1). The study offers valuable information for the efficient use of the herbicide, with impacts on plant production, promoting more intelligent approaches in the management of agricultural crops.