Revista Brasileira De Herbicidas 2012; 11(2): 159-173
Control and weeds new fluxes with association to amonio-glufosinate and pyrithiobac-sodium in cotton Liberty Link®
The accompaniment of cultivated areas with cotton Liberty Link genotype (LL®) in Brazilian Cerrado-like vegetation has conducted to the observation that amonio-glufosinate isolated does not have proportionate the adequate weeds control commonly found in these areas, becoming clear the necessity of several control interventions until crop closing. The objective of this work was to verify the benefits in associating pyrithiobac-sodium to applications carried with amonio-glufosinate in cotton Liberty Link genotype (LL®) for controlling and reducing weeds new infestation. The experiment was installed in Chapadão do Sul County, Mato Grosso do Sul State, using Fiber Max 966 LL® genotype spaced 0.90 m between lines. Treatments applications was carried out 15 days after crop emergency, by using the association between amonio-glufosinate and pyrithiobac-sodium herbicides in different doses, besides a treatment formed by the mixture between pyrithiobac-sodium and trifloxysulfuron-sodium. Amonio-glufosinate used alone was not efficient for controlling weeds presented in the area. The addition of pyrithiobac-sodium contributed for controlling weed specie as Commelina benghalensis, Amaranthus retroflexus, Ipomoea grandifolia and Euphorbia heterophylla. Residual activity of pyrithiobac-sodium, mainly in 42 or 56 g ha-1 doses represented to be an excellent option for Bidens pilosa and Euphorbia heterophylla residual control, what may cause the reduction of applications number in post emergency of the crop along its cycle.
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