‘BMX Ativa’ soybean responses after application of biofertilizer associated or not with glyphosate

Abstract

Even with the development of glyphosate-resistant soybean, there are cases in which harmful effects of intoxication occur, especially when the herbicide is applied in mixture with other products. The objective of this work was to verify the efficiency of biofertilizer as a glyphosate stress reducer in the soybean "BMX Ativa". The experiment was installed in a randomized block design, in a 3 × 5 + 1 factorial scheme, with four replications. In factor A, soybean development stages (V4, V8 and V4 + V8) were allocated, and in factor B the application of 0.1 L ha-1 of biofertilizer, 1,080 and 2,160 g ha-1 of a.e. of glyphosate, applied in isolated mode and/or mix in tank, plus one control without application as an additional treatment. The evaluated variables were phytointoxication, number of grains per plant, number of pods per plant, thousand grains mass and soybean grain yield. The application of double the dose of glyphosate (2,160 g ha-1) alone or in mixture with the biofertilizer in stages V4, V8 and V4 + V8 caused visual injuries to soybean 'BMX Ativa' until 28 days after application, but without affect the productive characteristics of the crop. The biofertilizer did not affect soybean plants and neither mitigate the negative effect of the highest dose of glyphosate.

Seletividade de herbicidas pós-emergentes isolados ou associados a fertilizante foliar na cultura da soja

“…The chemical control of weeds through the use of herbicides is the most common because of the efficiency and high operational yield, which allows flexibility in relation to the time of use and positioning in sowing lines (PEREIRA et al 2018). With the advancement of transgenic plants and biotechnology in agriculture, one of the characteristics that increase the efficiency of chemical control is the selectivity of herbicides to crops (WESTWOOD et al 2018), as in the case of glyphosate-resistant (RR) soybeans, which can metabolize the herbicide even before its action, in this way recovering from the poisoning effects without harming yield (GALON et al 2021).…”

“…However, interactions between herbicides and foliar fertilizers can result in synergistic, additive, or antagonistic effects when compared to stand-alone applications (ALVARENGA et al 2018). In the literature, many studies have described promising results regarding the association of herbicides and foliar fertilizers and/or biofertilizers (FORTE et al 2019, ANDRADE et al 2020, GALON et al 2021, which improve the effectiveness in terms of physiological stimuli, improve absorption, and change the pH of the solution (CARVALHO 2013).…”