Use of Liquid Fertilizer to Reduce the Phytotoxic Effects of Glyphosate on Eucalyptus

Abstract

-Glyphosate is a non-selective herbicide used for weed control in eucalyptus forests. Glyphosate drifts are common and may cause serious damage to crops. An alternative to reduce such effects is to use antidotes capable of protecting eucalyptus. An experiment was conducted to evaluate the effects of the application of liquid fertilizer on eucalyptus plants subjected to a glyphosate drift simulation. The treatments were arranged in a 5 x 5 factorial design. The first corresponding factor was liquid fertilizer (0, 1, 2, 4, and 8 L c.p. ha -1 of Fertiactyl Pós ® ) and the second factor dose of glyphosate drift (0, 360, 720, 1,440, and 2,160 g e.a. ha -1 ). The products were applied together so that the spray did not reach the upper third of the plants. At 7, 28, and 49 days after application (DAA), the percentage of intoxication of eucalyptus was evaluated. At 56 days DAA, height, leaf area, leaf nutrient contents, and shoot and root dry matter were determined. Higher doses of glyphosate (1,440 and 2,160 g ha -1 ) caused intoxication levels above 90% at 28 and 49 DAA without using liquid fertilizer. The combination of 2,160 g ha -1 of glyphosate with 8.0 L ha -1 of liquid fertilizer resulted in an estimated eucalyptus dry matter 7% higher than in the control and 97% higher than using 2,160 g ha -1 of glyphosate without the liquid fertilizer. We conclude that the liquid fertilizer was effective in suppressing the harmful effects caused by glyphosate on eucalyptus plants. Keywords

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

“…Similar results were found by Machado (2017a), to the accumulation of dry matter in the shoot and roots, where it was observed that the accumulation of dry matter of leaves, stem, roots and total in eucalyptus decreased as glyphosate increased but, in the presence of Fertiactyl Pós, these effects were reduced. It is possible to notice that, in relation to shoot dry matter, the increase in the dose of Fertiactyl Pós was greater than the corresponding dose of 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.…”

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.…”

Sequential Application of Herbicides Alone and in Mixture With and Without Foliar Fertilizer after Pruning of Cassava Plants

“…Zobiole et al (2011) found that glyphosate (1.8 kg ha -1 ) + foliar fertilizer (Amino Plus ® , 2 L ha -1 ) provided an increase of 81% in dry matter of RR soybean when compared to glyphosate alone (1.8 kg ha -1 ). Similarly, Machado et al (2017) found that glyphosate (2.16 kg ha -1 ) + foliar fertilizer (Fertiactyl Post ® , 8 L ha -1 ) provided a 97% increase in dry matter of eucalyptus plants when compared to glyphosate (2.16 kg ha -1 ) without foliar fertilizer, emphasizing the feasibility of adding foliar fertilizer to the herbicidal solution to increase herbicide selectivity.…”

“…As a proposal to reduce phytointoxication caused by herbicides, the addition of foliar fertilizer to the spray solution has been efficient due to the exogenous replacement of amino acids, which are suppressed by the mechanism of action of herbicides (Zobiole et al, 2011;Machado et al, 2017).…”