Protective Effect on Eucalyptus Plants and Signal Grass Control with a Tank Mixture of Glyphosate and Liquid fertilizer

Abstract

What is expected from an effective antidote, applied with an herbicide, is that it protects crops from damages by the herbicide without reducing its action on weeds. In this context, the goal of this study was to evaluate the effect of liquid fertilizer as a protector of eucalyptus plants and to control signal grass (Urochloa brizantha) submitted the application of glyphosate when applied in tank mixture. Plants were submitted to doses of liquid fertilizer and glyphosate; the application was performed so that the syrup would reach all aerial parts of the plants. The intoxication percentage of eucalyptus plants was evaluated on day 14, 35 and 49 after application (DAA). On day 49 DAA, the morphologic parameters of eucalyptus plants and the dry mass of signal grass were evaluated. The increase in glyphosate doses reduced the dry mass of signal grass, and 1,080 g ha-1 of glyphosate caused the death of the plant, regardless of the use of the liquid fertilizer. At 90, 180, 360 and 540 g ha-1 doses of glyphosate, the mixing tank with liquid fertilizer reduced glyphosate damages to signal grass. Higher doses of glyphosate caused greater toxicity in eucalyptus and the use of liquid fertilizer reduced this poisoning. High doses of glyphosate increased the control of signal grass, but they also increased the damages to eucalyptus, and the liquid fertilizer tends to reduce such damage. The tank mixture of glyphosate + liquid fertilizer (540 g ha-1 + 3 L ha-1) controlled signal grass without causing damages to eucalyptus.

Tolerância De Plantas Jovens De Café a Herbicidas Aplicados Isoladamente Ou Em Mistura Com O Fertilizante Fertiactyl

“…Uma de suas atribuições é permitir a utilização de herbicidas não seletivos às culturas (GALON et al, 2011). O caráter protetor do Fertiactyl apesar de ser um fertilizante foliar, vem sendo pesquisado para minimizar os efeitos tóxicos causados por herbicidas, com resultados positivos em algumas culturas como cenoura (SILVA, 2015), soja (SANTOS et al, 2015) e eucalipto (MACHADO et al, 2017a, MACHADO et al, 2017bMACHADO et al, 2017c). A utilização de protetores químicos é uma alternativa promissora para redução da fitotoxidade de herbicidas em plântulas de café, podendo reduzir a dificuldade de controle de plantas daninhas na fase inicial de implantação do cafezal devido a carência de herbicidas seletivos.…”

Use of foliar fertilizers as attenuators of injuries caused by glyphosate drift in young coffee plantations

“…In this study, it was possible to prove the efficiency of Fertiactyl Pós in reducing the harmful effects of glyphosate drift in coffee seedlings, adding information to the studies by Nascimento et al (2019) in coffee and Machado et al (2017aMachado et al ( , 2017bMachado et al ( , 2017c in eucalyptus. It also proved the same attenuation capacity when the seedlings were submitted to Crop + , an action never before tested in coffee crop.…”

“…The hypothesis of this study is that products as Fertiactyl Pós ® and Crop + have the potential to mitigate the toxic effects caused by glyphosate drift in coffee plants, as found by Machado et al, 2017a;Machado et al, 2017b;Machado et al, 2017c, in eucalyptus. It is expected that, in the near future, coffee producers will be able to carry out the initial management without fear of damaging their crops with intoxication of non-selective herbicides, without losses in development and yield.…”