EFEITO DE HERBICIDAS EM DUAS VARIEDADES DE CANA-DE-AÇÚCAR: FITOTOXICIDADE E CONTROLE DE PLANTAS DANINHAS

Abstract

In the Brazilian agricultural scenario of cane sugar industry is one of the most dynamic and competitive potential in the production of sugar, ethanol and bioenergy in the context of domestic and external sectors. Brazil is the largest producer of sugarcane (Saccharum spp.) In the world, estimated for the 2013/2014 season grind 660 million tons. The objective of this study was to evaluate the effect of herbicides applied pre-emergence on the cane on the phytotoxicity and weed control in two varieties of cane sugar. The experiment was conducted from August to December 2013 in Primavera Farm, located in Itambé - PE, the following experiment was a randomized block, factorial 2 x 5 with 4 replicates, totaling 40 experimental units. Each experimental unit consisted of 4 grooves 6 feet long spaced 1.25 meters between furrows, totaling 30m2, with an area of 15 m² plot comprising the two central rows, using two varieties of cane sugar five weed management, the characteristics were: linear number of tillers / m, Grade phytotoxicity, and weed control. The means were evaluated using Tukey's test at 5% probability. Regarding the varieties only the parameter number of tillers per meter (NPM) was significant at 60 and 90 days after application (DAA), and methods were significant in all parameters evaluated, 60 and 90 (DAA) in (NPM), and at 30, 60 and 90 (DAA) in weed control (CPD) and the degree of phytotoxicity, all the 1% probability by F test. The results showed that the range RB92579 grew more aggressive (tillering) is therefore an alternative to the cultural weed control and that, sulfentrazone provided sufficient weed control and selectivity to the culture of sugarcane.