Desempenho de soja transgênica a aplicação de glifosato e adubação foliar de manganês

Abstract

The glyphosate is one of the most widely used herbicides in the world in controlling invasive plant, allied to this technology, exists the soybean transgenic resistant to molecule of glyphosate (soybean Roundup Ready), which allows the application of post-emergence glyphosate in soybean. Over time it was observed that the soybean submitted to application of glyphosate presented an between in leaf nerves chlorosis derived from manganese deficiency, this deficiency by the population of microorganisms reducing manganese in the soil caused by exudates of the plant after a metabolism of glyphosate. Manganese participates in the processes of photolysis of water in photosynthesis, activation of enzymes and composition of chloroplast cells. The objective of the research was to evaluate the final productivity on the influence of glyphosate and manganese on the control of invasive plants. The research was carried out in the experimental farm of Unicesumar (BIOTEC), in the city of Maringá – Pr., agricultural year 2016/2017. The experiment was conducted in completely randomized blocks design, with 5 treatments and 5 repetitions, totaling 25 plots, being, Treatment 1 : no applications, Treatment 2: application of glyphosate in V4, Treatment 3: application of glyphosate and manganese in V4, Treatment 4: application of glyphosate in V4 and V6, Treatment 5: application of glyphosate and manganese in V4 and V6. During the development of the soybean, it did not show symptoms of phytotoxicity, due to the application of glyphosate. After the separate harvesting of each plot, the data were submitted to statistical analysis. In both final and bulk yield of one thousand grains, there was no significant increase in productivity due to the application of glyphosate plus manganese foliar fertilization.