Association of glyphosate and imidazolinones on red rice control in Clearfield™ rice/Associacao de glyphosate e imidazolinonas no controle de arroz-vermelho em arroz Clearfield

• Published in: Ciência rural 2013-12, Vol.43 (12), p.2154
• Main Authors: Menezes, Valmir Gaedke, Mariot, Carlos Henrique Paim, Kalsing, Augusto, de Freitas, Thais Fernanda Stella, Grohs, Daniel Santos, Matzenbacher, Felipe de Oliveira
• Format: Article
• Language: Spanish
• Subjects: Glyphosate; Rice
• ISSN: 0103-8478

The objective of this research was to evaluate the effects of the utilization of glyphosate and imidazolinones herbicides, in isolated or associated applications, on the effectiveness of red rice (Oryza sativa) control and grain yield of Clearfield-rice. The experiment was conducted under field conditions in 2007/08, in Cachoeirinha, RS, Brazil, using a randomized block design in a two-factorial design 2 x 6, with four replicates. The factor A was composed by two levels of glyphosate, applied during the subperiod between sowing and crop emergence at the early coleoptile stage of the rice plants; and the factor B consisted of six treatments with imazethapyr+imazapic, applied in association with glyphosate or when the rice crop plants had three expanded leaves. The crop and weed populations, red rice control and grain yield of crop were evaluated. The results show that the glyphosate application at the early coleoptile stage of the crop reduced 75% the red rice population and increased 40% the grain yield, in relation to the situation without weed control. The use of imidazolinones and their association with glyphosate provided effective control of red rice and increased the grain yield, independent of rates and application system.