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In Brazil studies of herbicides selectivity on the production parameters in sugar cane are generally carried out together with rehearsals of agronomic effectiveness in weeds and always using a checkplot per experimental replicate. When the contrast is analyzed considenry herbicide in relation to only one check without herbicide, there is a tendency in obtaining larger values for the variation coefficient, what could hide some effects of herbicides not selectives. Therefore, the objective of the present work, was specifically evaluate herbicide selectivity on sugarcane yield parameters: diameter, length, number of among knot and production of sugarcane stems, maintaining the portions constantly weeded, and using two lateral checks without herbicide adjacent to each treatment with herbicide. The results showed that in post-emergence, 2,4-D + hexazinone/ diuron (1.34 + 0.27/ 0.94 kg i.a./ there is) affected the diameter and the length of stems signifratinely, reducing the production in 16,6 t/ha. Tebuthiuron (0.96 kg i.a./ha) it affected the diameter, tebuthiuron + diuron (0.96 + 1.25 kg i.a./ha) and diuron + ametryn (1.25 kg i.a.l/ha) affected the number of among knot, reducing the stem production in 11.9; 17.0; 5.5 t/ha respectively. Ametryn (2.25 kg i.a./ha) and oxyfluorfen (0.72 kg i.a./ha) applied in pre-emergence they were not considered selective for the parameter number of among knot, however they didn't cause reduction in the stems production.

Seletividade de herbicidas sobre as características de produção da cana-de-açúcar utilizando-se duas testemunhas