Dessecação de plantas daninhas com glyphosate em mistura com uréia e sulfato de amônio
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Data
2009
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Resumo
Glyphosate is a non-selective systemic herbicide used to control annual and perennial
weeds worldwide. Molecule absorption occurs through the plant’s photosynthetically-active tissues;
however, some factors might reduce its efficacy, such as morphology and specific diversity, rain
after application, water quality and tank mixtures with other chemicals. Thus, this work aimed to
evaluate the influence of ammonium sulfate or urea addiction to spray tank on glyphosate efficacy
for weed desiccation. Two trials were carried out in Piracicaba – SP, with applications of glyphosate
(720 and 1440 g ha -1 ) alone or combined with two rates of ammonium sulfate (7.5 and 15.0 g L -1 )
or urea (2.5 and 5.0 g L -1 ), over the weeds Alternanthera tenella and Sorghum halepense. For the
least susceptible species (S. halepense), the addition of nitrogen sources to the lower rate of
glyphosate accelerated plant death, increasing the control levels up to 7.3%, at 21 days after
application (DAA). However, the effects were not observed when control, fresh and dry mass
were evaluated at 28 DAA. Glyphosate recommended rate for each species promoted appropriate
control, without the need to add ammonium sulfate or urea.
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Sorghum halepense, Eficácia, Alternanthera tenella, Manejo, Sorgum halepense, Efficacy, Alternanthera tenella, Management
Citação
CARVALHO, S. J. P.; DAMIN, V.; DIAS, A. C. R.; MELO, M. S. C.; NICOLAI, M.; CHRISTOFFOLETI, P. J. C. Dessecação de plantas daninhas com glyphosate em mistura com uréia e sulfato de amônio. Planta Daninha, Viçosa, v. 27, n. 2, p. 353-361, 2009.