Manejo químico de plantas daninhas na cultura da soja com associação de herbecidas pré e pós emergentes

Abstract

Brazil is the largest producer of soybeans in the world, so a large-scale and quality production is always expected, however, weeds in the middle of the crops come to hinder the development of soybeans, causing a reduction in productivity, with this the control of weeds is of paramount importance, seeking to have an environment without competition for the best development of the culture. In this context, the experiment aimed to evaluate soybean yield responses and weed control with the association of different pre- and post-emergent herbicides. Field tests were conducted on an agricultural property located in the municipality of Liberato Salzano-RS, from December 2021 to April 2022, with the cultivar Monsoy 5917 IPRO. The experimental design was in randomized blocks (DBC) with 11 treatments, the control being glyphosate, (pyroxasulfone + flumioxazin), (pyroxasulfone + flumioxazin) + glyphosate, (imazethapyr + flumioxazin), (imazethapyr + flumioxazin) + glyphosate, (sulfentrazone + diuron), (sulfentrazone + diuron) + glyphosate, (diclosulam), (diclosulam) + glyphosate and weeded with 4 repetitions, totaling 44 plots of 12.5 m2. The evaluations carried out were: visual weed control, visual phytotoxicity, dry mass of weeds at 45 days after emergence (DAE), at the end of the cycle, plant height, number of pods per plant, weight of a thousand seeds and productivity. With the results, it was possible to observe a statistical difference between treatments in all variables analyzed. It is concluded that the herbicides showed differences in efficiency on weed control and phytotoxicity, which reflected in the performance of the soybean crop, in this way, it was verified that the association of diclosulam + glyphosate presented the best results in the characteristics agronomic crops analyzed, demonstrating that weed control is of paramount importance, and directly reflects on the final productivity of the crop.