Validation of Cyhalofop-Butyl + clomazone to control Echinochloa colona (L.) Link in rainfed rice

Abstract

During seasonal cycles 2011 and 2012, four plots were established in the municipality of rice Tres Valles, Veracruz, in order to validate the experimental results of control of leg scorer grass [Echinochloa colona (L.) Link] with cyhalofop butyl + clomazone, compare their efficiency and profitability with the regional treatment and knowledge transfer of new technology to rice farmers from the center of the state of Veracruz. Both treatments were compared: 1-butyl Cyhalofop clomazone + 315 + 480 g ha-1; and 2. Propanil followed by propanil (regional treatment) in different doses each cycle according to the size of E. colona. Both cycles E. colona control and toxicity to rice at 25, 35 and 60 days after application of treatments was evaluated. Performance of paddy rice was also quantified and profitability of the treatments was determined. With cyhalofop butyl + clomazone end E. colona control was 91.25%, and the average yield of paddy rice in 5 033 kg ha-1, while the regional treatment these values were 49.50% and 2 883 kg ha-1, respectively. The benefit/cost with cyhalofop butyl clomazone + ratio was 1.507, much higher than the traditional treatment (0.802), primarily driven by higher grain yield obtained and a lower cost of control. New technology to 71 people, including rice farmers and technicians, transferred through two field demonstrations.