Portal de Pesquisa da BVS Veterinária

Semina Ci. agr.; 37(5): 2891-2900, Sept.-Oct.2016. tab

Artigo em Inglês | VETINDEX | ID: vti-745815

Resumo

Herbicides are an efficient weed-control method, and herbicide selectivity with regard to palm species is an important subject of agricultural research. Owing to a lack of studies in the literature regarding the use of herbicides on palm trees, especially during the early stages of growth, the present study aimed to evaluate the selectivity of some herbicides during the early development of Alexander palm (Archontophoenix alexandrae) and peach palm (Bactris gasipaes) seedlings. The study was conducted in two seasons in a completely randomized design with eight treatments and four repetitions. The herbicide treatments and dosages (g i.a. ha-1), were as follows: fluazifop-p-butyl (93.8), sethoxydim (184.0), quizalofop-p-ethyl (75.0) clethodim + fenoxaprop-p-ethyl (50.0 + 50.0), fomesafen (225.0), lactofen (168.0), and nicosulfuron (50.0), and a no-herbicide control was included. The seedlings of both types of trees were transplanted into 3.1-L plastic containers. In the first study, herbicide was applied to Alexander palm seedlings of 2530 cm in height. In the second study, herbicide was applied to Alexander palm seedlings of 3040 cm in height. Herbicide was applied to peach palm tree seedlings of 4055 cm in height in both studies. In peach palms only, the herbicides caused slight visible damage during early development. Collectively, the results suggested that all herbicides used are selective and can be used on peach palms during the various stages of development when there are one to four leaves. For Alexander palms, fluazifop-p-butyl, quizalofop-p-ethyl, and lactofen were the only herbicides that did not affect early development during the stages when the plant had one to four leaves.(AU)

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O uso de herbicidas destaca-se como método eficiente no controle de plantas daninhas e a seletividade destes às espécies de palmeira é um aspecto importante a ser avaliado. Devido à escassez de trabalhos na literatura com relação ao uso de herbicidas em palmeiras, principalmente para os estágios iniciais de crescimento, este estudo teve como objetivo avaliar a seletividade de alguns herbicidas no desenvolvimento inicial de mudas de palmeira-real australiana (Archentophoenix alexandrae) e de palmeira pupunha (Bactris gasipaes). O estudo foi conduzido em duas épocas, em delineamento experimental inteiramente casualizado, com oito tratamentos e quatro repetições. Os tratamentos foram herbicidas e doses, em g i.a. ha-1: fluazifop-p-butyl (93,8), sethoxydim (184,0), quizalofop-p-ethyl (75,0), clethodim + fenoxaprop-p-ethyl (50,0 + 50,0), fomesafen (225,0), lactofen (168,0), nicosulfuron (50,0) e testemunha sem aplicação de herbicida. As mudas de ambas as palmeiras foram transplantadas para vasos plásticos de 3,1L. A aplicação foi realizada sobre mudas de palmeira-real australiana com 25 a 30 cm de estatura no primeiro estudo e 30 a 40 cm no segundo estudo e em mudas da palmeira pupunha com 40 a 55 cm nos dois estudos. Os herbicidas causaram leves injúrias visuais durante o desenvolvimento inicial apenas nas plantas de palmeira pupunha. Todos os herbicidas utilizados foram seletivos e podem ser utilizados para a palmeira pupunha nos estádios de desenvolvimento de 1 a 4 folhas. Para a palmeira-real australiana apenas fluazifop-p-butyl, quizalofop-p-ethyl e lactofen não afetaram o desenvolvimento inicial nos estádios de desenvolvimento de 1 a 4 folhas.(AU)

Biblioteca responsável: BR68.1

Localização: BR68.1