Seletividade de herbicidas aplicados em pré-emergência na cultura de cana-de-açúcar tratada com nematicidas
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Data
2004-12-01
Autores
Negrisoli, E. [UNESP]
Velini, Edivaldo Domingues [UNESP]
Tofoli, G.R. [UNESP]
Cavenaghi, A.L. [UNESP]
Martins, D. [UNESP]
Morelli, J.L. [UNESP]
Costa, A.G.F. [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Brasileira da Ciência das Plantas Daninhas
Resumo
O objetivo do trabalho foi estudar a seletividade de herbicidas para a cultura da cana-de-açúcar quando aplicado em culturas tratadas com nematicidas. O experimento foi instalado em área pertencente à Usina São José, município de Borebi-SP, ano agrícola de 2000/01. A variedade de cana-de-açúcar utilizada foi a RB855113. Utilizou-se o delineamento experimental de blocos ao acaso em parcelas subdivididas, com quatro repetições. Cada parcela correspondeu a 27 linhas de 10,0 m, espaçadas em 1,0 m, sendo dividida em três subparcelas. As parcelas corresponderam aos tratamentos com os herbicidas, e as subparcelas, à aplicação ou não dos nematicidas carbofuran (2,10 kg ha-1) e terbufós 2,25 kg ha¹). Os herbicidas testados foram: tebuthiuron (1,12 kg ha-1), ametryne (1,75 kg ha¹), sulfentrazone (0,8 kg ha-1), metribuzin (1,92 kg ha-1), isoxaflutole (0,0525 kg ha¹), clomazone (1,25 kg ha¹), oxyfluorfen (0,36 kg ha-1) e azafenidin+hexazinone (0,1575 + 0,2025 kg ha-1), sendo todos aplicados em pré-emergência, além de uma parcela como testemunha. Os resultados obtidos evidenciaram que os herbicidas oxyfluorfen e azafenidin+hexazinone causaram os maiores níveis de fitotoxicidade na cana-de-açúcar, independentemente do uso dos nematicidas carbofuran e terbufós. Os herbicidas tebuthiuron, ametryne, sulfentrazone, metribuzin, isoxaflutole, clomazone, oxyfluorfen e azafenidin+hexazinone, aplicados em doses representativas das comercialmente utilizadas, mostraram-se seletivos à cana-de-açúcar, não afetando seu crescimento, sua produtividade e suas características tecnológicas. Os nematicidas não interferiram nos níveis de intoxicação provocados pelos herbicidas utilizados na cultura.
The objective of this work was to study the selectivity of herbicides to sugarcane when applied in crops treated with nematicides. The experiment was carried out in Borebi, São Paulo-Brazil, during the growing season 2000/2001. The sugar cane variety RB855113 was used. The experimental design was a randomized block in split-plots with 4 repetitions. Each plot corresponded to 27 rows of 10.0m, 1.0 m spaced, split into three sub-plots. The plots corresponded to the treatments with the herbicides and the sub-plots to the application or not of the nematicides carbofuran (2.10 kg ha-1) and terbufos (2.25 kg ha-1). The following herbicides were studied: tebuthiuron (1.12 kg ha-1), ametryne (1.75 kg ha-1), sulfentrazone (0.8 kg ha-1), metribuzin (1.92 kg ha¹), isoxaflutole (0.0525 kg ha-1), clomazone (1.25 kg ha-1), oxyfluorfen (0.36 kg ha-1) and azafenidin+ hexazinone (0.1575 + 0.2025 kg ha-1). All the herbicides were applied in pre-emergence. The results showed that the herbicides oxyfluorfen and azafenidin+hexazinone caused the most severe phytotoxicity symptoms. Regardless of nematicide application, all the herbicides were selective to the crop, providing growth rates and yields similar to the controls. The selectivity of the herbicides was not affected by the nematicides.
The objective of this work was to study the selectivity of herbicides to sugarcane when applied in crops treated with nematicides. The experiment was carried out in Borebi, São Paulo-Brazil, during the growing season 2000/2001. The sugar cane variety RB855113 was used. The experimental design was a randomized block in split-plots with 4 repetitions. Each plot corresponded to 27 rows of 10.0m, 1.0 m spaced, split into three sub-plots. The plots corresponded to the treatments with the herbicides and the sub-plots to the application or not of the nematicides carbofuran (2.10 kg ha-1) and terbufos (2.25 kg ha-1). The following herbicides were studied: tebuthiuron (1.12 kg ha-1), ametryne (1.75 kg ha-1), sulfentrazone (0.8 kg ha-1), metribuzin (1.92 kg ha¹), isoxaflutole (0.0525 kg ha-1), clomazone (1.25 kg ha-1), oxyfluorfen (0.36 kg ha-1) and azafenidin+ hexazinone (0.1575 + 0.2025 kg ha-1). All the herbicides were applied in pre-emergence. The results showed that the herbicides oxyfluorfen and azafenidin+hexazinone caused the most severe phytotoxicity symptoms. Regardless of nematicide application, all the herbicides were selective to the crop, providing growth rates and yields similar to the controls. The selectivity of the herbicides was not affected by the nematicides.
Descrição
Palavras-chave
fitotoxicidade, interação, Saccarum afficinalis, phytotoxicity, interaction, Saccarum afficinalis
Como citar
Planta Daninha. Sociedade Brasileira da Ciência das Plantas Daninhas , v. 22, n. 4, p. 567-575, 2004.