Revista Brasileira De Herbicidas 2008; 7(1): 1-14

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Effect of sulfentrazone in the integrated system using sugarcane mulch residue, herbicide and vinasse on purple nutsedge (Cyperus rotundus) initial development

DOI: 10.7824/rbh.v7i1.58

The objective of this work was to evaluate the interactions among sugarcane mulch residue, the herbicide sulfentrazone and different application methods of vinasse, a sugarcane industry residue, on the initial development of purple nutsedge (Cyperus rotundus L.). A greenhouse experiment was set up using pots with soil, in randomized complete blocks, with four replications and the following treatments were studied: control (C), straw alone (P), vinasse alone (V), herbicide alone (H), straw + vinasse (PV), straw + herbicide (PH), herbicide + vinasse applied before the herbicide (HVa), herbicide + vinasse applied after the herbicide (HVd), herbicide + vinasse applied together (HVj), straw + herbicide + vinasse applied before the herbicide (PHVa), straw + herbicide + vinasse applied after the herbicide (PHVd) and straw + herbicide + vinasse applied together (PHVj). Sulfentrazone was applied at the rate of 700 g ha-1, and in the treatments HVj, sulfentrazone was diluted in water until ¼ of the necessary volume, the remaining ¾ being completed with vinasse. In the statistical analysis the F test was used while the Scheffé test was employed to study the following contrasts: C x H, C x P, Cx V, C x treatments with H, C x treatments with S; C x treatments with V; without herbicide x with herbicide; without straw x with straw, without vinasse x with vinasse, HVa x HVd; HVa x HVj, HVa x HVj; HVa x SHVa, HVd x SHVd, HVj x SHVj, SHVa x SHVd, SHVd x SHVj and SHVd x SHVj. It was uses the Duncan’s test for the umidity straw avaliation. It was concluded that sulfentrazone applied alone or on the sugar cane mulch residue or with vinasse applied before, after or in mixture with herbicide controlled the initial development of purple nutsedge. Sugar cane mulch residue reduced the initial development of purple nutsedge but the height of plants was increased due to etiolation. Vinasse applied on the soil without sugar cane mulch residue and without sulfentrazone stimulated the development of this weed. There wasn’t difference among appling vinasse before, after or in mixture with sulfentrazone in the treatments with or without straw.