Pulverização de glyphosate utilizando solução de uréia + sulfato de amônio
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Data
2012-04
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Resumo
Several trials have been carried out for increasing glyphosate efficacy on weed
burndown, including the addiction of ammonium sulfate and urea as adjuvants. On a
physiological approach, there are explanations to complementary effect of these fertilizers when
concomitantly added to herbicide spray solution. Therefore, three experiments were developed in
field conditions with the objective of evaluating glyphosate efficacy for burning down different
weed species by using solution of nitrogen fertilizers as spraying vehicles. Six treatments were
evaluated, as follows: glyphosate (540 g a.e. ha -1 ) application using water, solution of ammonium
sulfate – AMS (15 g L -1 ), solution of urea – U (5 g L -1 ), solution of U+AMS (2.5 + 7.5 g L -1 ) as spraying vehicles, glyphosate at 1080 g a.e. ha -1 sprayed with water, and check without
application. Treatment’s efficacy was evaluated on mixed community of weeds, Brachiaria
decumbens and Sorghum halepense. The use of nitrogen fertilizer solutions as glyphosate
spraying vehicles did not increase B. decumbens control. The lower rate of glyphosate had higher
efficacy over mixed weed community and over S. halepense due to the use of ammonium sulfate
(15 g L -1 ) or U+AMS (2,5 + 7,5 g L -1 ) solution as spraying vehicles. The positive results reached
after glyphosate application with nitrogen fertilizers were also observed on the reduction of the
mixed weed community fresh mass and for S. halepense fresh and dry mass.
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Eficácia, Brachiaria decumbens, Fertilizantes, Sorghum halepense, Efficacy, Brachiaria decumbens, Fertilizer, Sorghum halepense
Citação
CARVALHO, Saul Jorge Pinto; DAMIN, Virginia; DIAS, Ana Carolina Ribeiro; TAROZZO FILHO, Heryaldo; CHRISTOFFOLETI, Pedro Jacob. Pulverização de glyphosate utilizando solução de uréia + sulfato de amônio. Revista Brasileira de Herbicidas, Londrina, v. 11, n. 1, p. 84-95, jan./abr. 2012.