Action of PROTOX inhibitors herbicide on the development, lodging and yield of soybean

Abstract

Soybean is the most important leguminous species worldwide and therefore investments in technologies are needed to increase productivity and reduce adverse factors to the crop. In Southern Brazil, there are often problems caused by lodging of plants from some soybean cultivars. This study aimed to evaluate the effects of application of Protoporfirinogênio Oxidase (PROTOX) inhibitors herbicides on development, yield and components and plant lodging on the cultivar CD 214 RR. The experiment was conducted under field, in randomized block design with four replications in a factorial model. Factor A included five herbicides treatments: carfentrazone at doses 6, 10 and 22 g ha^-1 of a.i., lactofen 144 g ha^-1 of a.i. and control without application. The factor B consisted of six assessment times of injury and seven times for plant height and lodging. Soybean plant injury, height, lodging, yield, yield components and biological yield are assessed. The lactofen and carfentrazone herbicides were able to reduce the height and consequently the soybean lodging. Carfentrazone was more phytotoxic and more effective in reducing the soybean plants height than lactofen. Lactofen resulted in soybeans grain yield higher than different concentrations of carfentrazone, although both did not differ in yield grain of the control without herbicides.