RESPOSTA MORFOFISIOLÓGICA DO ALGODOEIRO (Gossypium hirsutum L.) À APLICAÇÃO DE GLIFOSATO E BIOESTIMULANTE NO DESENVOLVIMENTO INICIAL

Abstract

Weeds stand out as the main limiting factor to the productive potential of crops, competing with them for water, light, and nutrients. Several studies suggest improved control of invasive species through the use of pre- and post-emergence herbicides such as glyphosate; however, even tolerant cultivars may experience phytotoxic effects. In this context, amino acid-based products have shown promise in mitigating such damage. The product is an amino acid-based biostimulant developed for crops like cotton, aiming to reduce phytotoxicity caused by post-emergence herbicide applications. Nevertheless, there are no published studies confirming its effectiveness in mitigating glyphosate-induced damage. The objective of this study was to assess the cotton plant’s response to the application of the biostimulant in mitigating damage caused by glyphosate. The experiment was conducted in the field at the Federal Institute of Goiás – Posse Campus, using a randomized block design (RBD) in a 2 × 5 factorial scheme with four replications. Treatments included the presence or absence of glyphosate and five doses of the biostimulant biostimulant (0; 0.25; 0.50; 1.00; and 2.00 L/ha), totaling 40 experimental plots. Evaluations included chlorophyll content, shoot and root dry mass, plant height, and symptoms of phytotoxicity. Results indicated that the product contributed to reducing herbicide effects, with the 0.50 L/ha dose showing increased chlorophyll content at 35 days after application, and the 1.00 L/ha dose promoting greater root dry mass accumulation. Therefore, biostimulant demonstrated potential as a physiological management strategy under chemical stress conditions.