Abstract

BACCIN, Luisa Carolina et al. Techniques for mitigating the symptoms of injury of glyphosate in RR and RR2 soybean. Rev. de Ciências Agrárias [online]. 2019, vol.42, n.4, pp.91-100. ISSN 0871-018X.  https://doi.org/10.19084/rca.18326.

The use of high rates of glyphosate, even if tolerant (RR) technology, can cause leaf insults, such as the yellow flashing effect, which is characterized by a yellowing of the leaves, which can lead to loss of yield. The present study aimed to increase doses of glyphosate in tolerant soybean. Tests were conducted in greenhouse 2015/2016 and 2016/2017, in Palotina, western region of Paraná in a completely randomized arrangement. The first assay was conducted in a 3x8 factorial set (products x cultivars) with four replicates mixed with glyphosate with growth regulator, one compound of amino acids and one source of manganese, and in the second a factorial scheme 6x3 (products x cultivars) using glyphosate, a growth regulator, a source of manganese and the glyphosate associated to the other products, besides a control without application. A phytotoxicity, chlorophyll index, shoot dry mass and root mass were evaluated visually. A variation of response to cultivar was observed due to characteristics of each genotype. The differences between the products were not observed. A cultivar ‘M6210’ presented greater symptom of crop injury while cultivating ‘BMX Ponta’, presenting greater tolerance. No phytotoxic effect was observed for the test.

Keywords : Glycine max L. Merr.; herbicides; yellow flashing; transgenic crops.

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