Controle de Ipomoea triloba com glifosato associado a aditivos e adjuvantes de calda

Abstract

The herbicide glyphosate is commonly used to control weeds in the soybean crop, with some species tolerant to it. The weed species Ipomoea triloba (bindweed) is tolerant to the usual doses of the herbicide glyphosate, so there is a need to increase your dose to control effectively. It is also used to spray adjuvants and additives to improve the performance of control with this herbicide. In view of this, four experiments were conducted, three in the field, and one in the greenhouse. The first three were to evaluate the control of I. triloba with formulations of glyphosate associated with the additives and processing of water, where the Experiment I was set to low relative humidity (RH) (below 40%) and Experiments II and III to RH ideal (above 60%). The fourth experiment aimed to evaluate the control of I. triloba with different doses of glyphosate Trop associated with different adjuvants and additives for water. The results showed that the addition of the herbicide glyphosate and adjuvants reduces the pH of the solution. The herbicide used in treatments I and II should be applied in higher doses to have efficient control of the species. There was improvement in the efficiency of control with the addition of adjuvants to the herbicide, the recommended dose of the product. The application of adjuvants associated with glyphosate use has not improved the efficiency of control in the experiment III, the lowest dose used. With the experiment of dose-response curve only the addition of additives urea and A-20 showed glyphosate results in control. Considering the dry matter, the addition of adjuvants and aditives, except for Impact Plus, provided an improvement in the performance of control.