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Signal grass ( Urochloa decumbens ) control with glyphosate plus boric acid at 30 days after application (DAA).
Source publication
The objective of this study was to evaluate the control of weeds in the rows of eucalyptus (Eucalyptus urograndis) with herbicides applied singly or combined with boron (B), as well as, the response of Eucalyptus plants to this micronutrient. The experiments were carried out in a split-plot with randomized complete block design, with three replicat...
Context in source publication
Context 1
... 7 DAA, for both experiments. The addition of boric acid in the spray solution did not affect the efficacy of glyphosate in controlling signal grass. The symptoms were characterized by leaf chlorosis with progression to necrosis and death of leaves at 21 DAA, keeping the tree rows free of signal grass in 1m on each side of the eucalyptus plants ( Figure. 1). Eucalyptus plants grown with fixed control ranges from 1m on each side of the crop row proved superior diameter at breast height, height and volume compared to plants grown to 0.5m ( Toledo et al., ...
Citations
... Some of these are being tested here or even had their "behavior" initially studied on our soils, species, clones and environmental conditions through drift simulation experiments. Some herbicides used in other countries or with research initiated in Brazil include: acetochlor (Villalba et al., 2010); 2,4-D, atrazine and diuron (Brasil et al., 1976); chlorimuron-ethyl (Brighenti et al., 2015); clomazone (Takahashi et al., 2009);fluroxypyr, fomesafen, haloxyfopmethyl, indaziflam, lactofen, metsulfuronmethyl, paraquat, sethoxydim+diclosulam (Agostinetto et al., 2010); saflufenacil, metolachlor, sulfometuron-methyl (Blazier et al., 2012), terbacil + sulfometuron-methyl (Churchill and Beadle, 2011;Osiecka and Minogue, 2015), triclopyr and fluroxypyr + triclopyr (Carvalho et al., 2014). ...
... Studies about the optimization of forest practices in eucalypt areas are still scarce, but deserve attention and can be quite promising to optimize the time spent with it and reduce costs onindividual pesticide treatments. Brighenti et al. (2015) sprayed herbicides alone (glyphosate, isoxaflutole and oxyfluorfen) or combined with boron on Eucalyptus urograndis. The presence of boric acid in the spraying solution mixed with herbicides did not affect weed control, but still increase boron content in the soil and consequently in E. urograndis leaves. ...
Para garantir a máxima produtividade florestal, a adoção de um manejo eficiente é essencial. O controle de plantas daninhas é muito importante, já que a presença dessas pode ocasionar competição por fatores fundamentais ao desenvolvimento das plantas. A interferência das plantas daninhas pode ocasionar perdas de até 50 % na produtividade e mais de 90 % de redução na rentabilidade das áreas florestais. O controle químico é amplamente utilizado no manejo das plantas daninhas, e cerca de 30 % dos custos totais de produção e mais de 50 % da mão-de-obra utilizada na cultura do eucalipto são destinadas para esse propósito. O setor florestal tem uma grande expressividade econômica, mas poucos herbicidas são registrados. O controle químico ainda deve se encaixar aos padrões requeridos pelas certificadoras. A expansão do setor e a importância econômica do eucalipto no Brasil fazem necessário o desenvolvimento de novos herbicidas, novas tecnologias de aplicação, novas pesquisas, bem como a adoção de um plano de manejo integrado de plantas daninhas em eucalipto.
