Assessment of Roundup Ready 2 (RR2) corn subjected to application of isolated and associated herbicides

Made available in DSpace on 2022-04-28T19:29:10Z (GMT). No. of bitstreams: 0 Previous issue date: 2017-01-01 One of the first transgenic traits that has been inserted into commercial crops and being widely used is tolerance to glyphosate herbicide. This technology has provided significant benefits and conveniences to farmers due to the efficacy of glyphosate. However, for a better weed control and prevention of weed resistant biotypes the use of two or more mechanisms is recommended practice. The combination of herbicides is the subject of several studies especially evaluating weed control, aside which the selectivity of the culture is equally important. In this context, this study aimed to evaluate the responses of transgenic corn (RR2) subjected to the application of different herbicides. For this purpose, an experiment was conducted with eight treatments using glyphosate, atrazine and nicosulfuron, sole or in combination along with a control treatment (without herbicide). The experiment was performed twice (first in Piracicaba - SP then Palotina - PR) in greenhouse with different corn hybrids. Several variables related to the performance were analysed such as height measurements, stem diameter, chlorophyll index, fresh and dry shoot, root dry mass. The results showed that nicosulfuron should be positioned cautiously in new RR2 corn hybrids, as it may damage the development of the plant. Federal University of Parana, Palotina Campus, Pioneer Street, 2153 - Garden Dallas State University of the Western of Paraná University Street, 2069 - University Garden State University of São Paulo Júlio de Mesquita Filho, Dr. José Barbosa de Barros Street, 1780 University of São Paulo/ Luiz de Queiroz College of Agriculture Padua Dias Avenue, 11 - Agronomy State University of São Paulo Júlio de Mesquita Filho, Dr. José Barbosa de Barros Street, 1780