Abstract
The glufosinate-ammonium is an herbicide with contact action and, whenused in tolerant LL maize, requires associations with other products to improve the weed control spectrum and increase the residual period in the area. The aim of this work was to evaluate the efficacy and selectivity of glufosinate-ammonium, applied alone and in combination with other herbicides, for weed control in maize crops. The treatments consisted of two strategies. In the first one, the following herbicides were applied in pre-emergence conditions: atrazine, [atrazine + simazine], [atrazine + oil], [atrazine + S-metolachlor], and S-metolachlor; with the subsequent application of glufosinate-ammonium in post-emergence condition of maize. The second application method corresponded to the use of glufosinate-ammonium, alone and combined with nicosulfuron + mesotrione and the other products used in the first strategy, in addition to two control areas, being one weed-infested and the other weed-free. Phytotoxicity on maize and weed control were assessed. Ear insertion height, number of rows per ear, number of grains per row, thousand grain weight and maize yield were determined upon harvesting. The herbicides were effective and did not cause yield loss to the crop. The herbicides applied in combination with glufosinate-ammonium were efficient in regard to weed control and selective to maize.
Highlights
Resumo - O amônio glufosinato é um herbicida com ação de contato e quando usado em milho tolerante “LL” necessita de associações com outros produtos para melhorar o espectro de controle e aumentar o período residual na área
As it is an herbicide of broad action spectrum, it is usually applied in presowing desiccation or used in directed spraying
At 14 days after treatment application (DAT), all herbicides caused phytotoxicity, though the symptoms were always inferior to 5%
Summary
Resumo - O amônio glufosinato é um herbicida com ação de contato e quando usado em milho tolerante “LL” necessita de associações com outros produtos para melhorar o espectro de controle e aumentar o período residual na área. Os herbicidas aplicados em associação com o amônio glufosinato foram eficazes no controle das plantas daninhas e seletivos ao milho. Weed biotypes resistant and tolerant to glyphosate are widely distributed throughout the main grainproducing regions in Brazil (Lucio et al, 2019) Such fact has been causing an increase in weed control costs and yield losses, resulting in high losses to farmers (Adegas et al, 2017). Maize tolerant to glufosinate-ammonium, with LibertyLink® technology (LL), represents the possibility of using a new alternative to help with weed management This herbicide is characterized by contact action, being applied in post-emergence conditions, with broad action spectrum (Rodrigues & Almeida, 2018). In the Brazilian market, there are soybean, maize and cotton cultivars that are tolerant to that herbicide molecule
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