Formulações e mistura de glyphosate sobre endossimbioses e o desempenho agronômico da soja Roundup Ready®

• Autor(a) principal: Gonçalves, Clebson Gomes
• Data de Publicação: 2014
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/2026
• topic: Fungos micorrizicos; Herbicida; Nutrição mineral; Mycorrhizal fungi; Herbicide; Mineral nutrition; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA

It was evaluated the effect of different commercial formulations of glyphosate and the effects of glyphosate isolate and in mixture with chlorimuron-ethyl, flumioxazin and lactofen on endosymbionts microorganisms and on the agronomic performance of soybean resistant to glyphosate. Field experiments were settled for the different formulations in agricultural years of 2010/2011 and 2011/2012. The treatments consisted on application of the isopropyl salt (Roundup Original, Trop); ammonium salt (Roundup Ultra®, Roundup WG) and potassium salt (Roundup Transorb R, Zapp QI), all dose of 720 g a.e. ha-1 glyphosate and two controls (with and without weeds). The mycorrhizal colonization as well as dry matter of aerial part of soybean plants was not affected by the different formulations of glyphosate. Also no difference was found in the accumulation of macronutrients (nitrogen and phosphorus). In the second valuation year (2011/2012), the Mn accumulation was reduced for all formulations except for the formulation Roundup Original. However, this reduction did not influence the observed response of the plants in relation to the productive income. To evaluate effects of glyphosate mixed with different herbicides a field experiment was installed in the agricultural year 2011/2012. The treatments consisted of isolated application of glyphosate (480 g a.e. ha-1), mixtures of glyphosate (480 g a.e. ha-1) with: chorimuron ethyl at doses of 3, 6 and 10 g a.i. ha-1, lactofen at doses 30, 60 and 100 g a.i. ha-1 and flumioxazin at doses of 5, 10 and 15 g a.i. ha-1; and two controls (with and without weeds). All mixtures showed python intoxication in cultivars evaluated. Reduction was also evident for plant height and dry weight of the aerial part with increasing doses of lactofen and flumioxazin mixed with glyphosate. The dry mass of nodules was reduced as increased doses of glyphosate + lactofen or flumioxazin. All mixtures evaluated compromise the efficiency of mycorrhizal colonization, however just to mix glyphosate + lactofen was observed negative effect on productive performance.