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Planta Daninha

Print version ISSN 0100-8358

Planta daninha vol.11 no.1-2 Viçosa  1993

http://dx.doi.org/10.1590/S0100-83581993000100007 

Injúria potencial de herbicidas de solo ao girassol. II – chlorimuron-ethyl

 

Potential suflower injury by soil applied herbicides. II – chlorimuron-ethyl

 

 

Nilson G. FleckI; Ribas A. VidalII

IEng. Agr., Ph. D., Prof. Adjunto, Dep. de Plantas de Lavoura da UFRS/Fac. de Agron., Av. Bento Gonçalves, 7712, Caixa Postal 776, CEP 90001-970, Porto Alegre, RS. Bolsista do CNPq
IIEng. Agr., MSc., Prof. Assistente, Dep. de Plantas de Lavoura da UFRS/Faculdade de Agronomia

 

 


RESUMO

Conduziu-se um ensaio de campo na Estação Experimental Agronômica da Universidade Federal do Rio Grande do Sul, em Eldorado do Sul, RS em 1989/90. O objetivo do trabalho foi determinar o efeito residual potencial do herbicida chlorimuron-ethyl aplicado em três doses à superficie do solo (PRE) ou incorporado no mesmo (PPI), sobre a cultura de girassol. A atividade de chlorimuron-ethyl (etil 2-((((4-cloro-6-metoxipirimidina-2 il)amino)carbonil)amino)sulfonil)benzoato) não foi dependente de sua posição no solo. Chlorimuron-ethyl promoveu injúria inicial acentuada, constatando-se pouca ou nenhuma resposta ao aumento da dose para matéria seca da parte aérea do girassol, área foliar e estatura das plântulas. Contudo, avaliação de estatura das plantas, realizada na maturação fisiológica, indicou que os danos promovidos pelo herbicida reduziram-se com o decorrer do tempo. Concluiu-se que, aparentemente, num sistema de sucessão soja-girassol, o efeito residual potencial de chlorimuron-ethyl ao girassol é pequeno.

Palavras-chave: Helianthus annuus, herbicidas residuais, dissipação de herbicidas, persistência no solo, rotação de culturas, sulfoniluréias.


ABSTRACT

A field experiment was carried out during 1989/90 at the Eldorado do Sul Experimental Station of Federal University of Rio Grande do Sul, Brazil with the objective of evaluating potencial injury to sunflower by chlorimuron-ethyl applied at three different dosages in pre-emergence (PRE) or preplant incorporated (PPI). Chlorimuron-ethyl activity was not dependent on the application method. Early in the season there were higher levels of injury to the plants, with little or no response to dosages with regard to shoot weight, leaf area and seedling size. However, plant height assessed late in the season indicated recovery from initial symptoms. Apparently, chlorimuron-ethyl injury to sunflower is limited in a rotation soybean-sunflower.

Additional index words: Helianthus annuus, residual herbicide, herbicide dissipation, soil persistence, crop rotation, sulfonylureas.


 

 

Texto completo disponível apenas em PDF.

Full text available only in PDF format.

 

AGRADECIMENTOS

Ao Dr. João Riboldi, do Instituto de Matemática da UFRS, pelo apoio na análise estatística dos resultados.

 

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Recebido para publicação em 06/04/93 e na forma revisada em 10/12/93.

 

 

Extraído da Dissertação apresentada pelo segundo autor para obtenção do grau de Mestre em Fitotecnia pela Fac. de Agron. da Univ. Fed. do Rio Grande do Sul (UFRS), Porto Alegre, RS. Trabalho parcialmente financiado pelo CNPq(Processo n° 414024/89-3lAG).

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