Associação de herbicidas aplicados para o controle de plantas daninhas em soja resistente ao glyphosate

Revista Brasileira de Herbicidas

Luciane Renata Agazzi¹  Carlos Orestes Santin¹  Felipe José Menin Basso¹  Renan Carlos Fiabane¹  Fábio Luís Winter¹  Felipe Nonemacher¹  Cesar Tiago Forte²  Rosilene Rodrigues Kaizer Perin³  Leandro Galon⁴ 

[1] Aluno de Agronomia da UFFS;Mestrando do PPGCTA da UFFS;Professora do PPGCTA e do IFRS;Universidade Federal da Fronteira Sul (UFFS-RS)

关键词: Digitaria ciliaris;    Glycine max;    Urochloa plantaginea;   

DOI  :  10.7824/rbh.v16i2.529

学科分类：农业科学（综合）

来源: Sociedade Brasileira da Ciencia das Plantas Daninhas (S B C P D) / Brazilian Society of Herb Science

【 摘 要 】

In order to bypass cases of glyphosate-resistant weeds, it becomes necessary to use herbicides with other action mechanisms. The goal of this work was to evaluate the effectiveness and selectivity of herbicides with isolated or tank mix application for the management of soybean-infesting glyphosate-resistant weeds. Treatments were applied sequentially, during pre-emergence clomazone (900 g ha -1 a.i.); flumioxazin (50 g ha-1 a.i.); diclosulam (35.02 g ha-1 a.i.); s-metolachlor (1152 g ha-1 a.i.); sulfometuron + chlorimuron-ethyl (18.75 + 18.75 g ha-1 a.i.); pendimethalin (1250 g ha-1 a.i.); sulfentrazone (250 g ha-1 a.i.); sulfentrazone + chlorimuron-ethyl (250 + 20 g ha-1 a.i.); imazethapyr + sulfentrazone (100+250 g ha-1 a.i.) and imazaquin (150 g ha-1 a.i.) and, during post-emergence, glyphosate was used over these treatments (1080 g ha-1 a.e.). During post-emergence, glyphosate was applied in an isolated manner (1080 g ha-1 a.e.) and, mixed in the sprayer tank with glyphosate (1080 g ha-1 a.e.), imazethapyr (100 g ha-1 a.i.), clethodim (96 g ha-1 a.i.) and chlorimuron-ethyl (20 g ha-1 a.i.), plus the infested and weeded control samples. The experimental area was infested with 75% of creeping signalgrass plants ( Urochloa plantaginea ) and 25% of summergrass ( Digitaria ciliaris ), at the average densities of 133 and 45 plants m-2 , respectively. At 14 and 21 DAT, the application of glyphosate + [sulfometuron + chlorimuron-ethyl] caused a 67 and 62% phytotoxicity to soybean, respectively. In order to control summergrass and creeping signalgrass, this very mixture presented an 88% index at 21 DAT, whereas control for the other treatments exceeded 91% during all evaluated periods. All the evaluated treatments caused over 91% control of both weeds, except for glyphosate + [sulfometuron + chlorimuron-ethyl]. The associations of herbicides to glyphosate caused weed control and were selective to soybean, except for sulfometuron + chlorimuron-ethyl, which presented lower control and high phytotoxicity. Some herbicides damaged the yield components of soybean, but only the sulfometuron + chlorimuron-ethyl mixture caused a reduction in grain productivity.

【 授权许可】

CC BY