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Title: Quinoa (Chenopodium quinoa) reaction to herbicide residue in a Brazilian Savannah soil
Other Titles: Reação de quinoa (Chenopodium quinoa) a resíduos de herbicida em um solo de Cerrado
Authors: Santos, Roberto Lorena de Barros
Spehar, Carlos Roberto
Vivaldi, Lúcio José
Assunto:: Quinoa
Erva daninha - controle
Chenopodium quinoa
Herbicidas
Plantas - efeito dos herbicidas
Issue Date: Jun-2003
Citation: SANTOS, Roberto Lorena de Barros; SPEHAR, Carlos Roberto; VIVALDI, Lúcio José. Quinoa (Chenopodium quinoa) reaction to herbicide residue in a Brazilian Savannah soil. Pesquisa agropecuária brasileira, Brasília, v. 38, n. 6, p. 771-776, jun. 2003. Disponível em: <http://www.scielo.br/pdf/pab/v38n6/18227.pdf>. Acesso em: 19 jan. 2011. doi: 10.1590/S0100-204X2003000600014.
Abstract: ABSTRACT
O cultivo da quinoa (Chenopodium quinoa Willd.), um dos mais promissores em sucessão à soja ou ao milho, depende do controle de plantas daninhas. O objetivo deste trabalho foi estudar a reação da quinoa a resíduos de herbicidas num solo de cerrado. Seis tratamentos com herbicidas, trifluralin, pendimethalin, clomazone, imazaquin, trifluralin + imazaquin e testemunha, foram aplicados, antes da semeadura de soja, cultivar BR 9 Savana, em um Latossolo Vermelho-Escuro. Amostras de solo foram coletadas aos 15, 38, 100, 145 e 206 dias após a aplicação e armazenadas sob temperatura de -5oC. Bioensaios foram conduzidos em casa de vegetação, usando a quinoa, cultivar Q18. Imazaquin mostrou-se o mais prejudicial à quinoa até os 206 dias, seguido por clomazone entre 15 e 38 dias após a aplicação; trifluralin e pendimethalin não mostraram efeito residual. Estes resultados sugerem ampliar a triagem, com a inclusão de novos produtos.
Abstract: The quinoa (Chenopodium quinoa Willd.) cultivation, one of the most promising in double cropping with soybeans or maize, depends on weed control. The objective of this work was to evaluate quinoa reaction to herbicide residue in a savannah soil. Six herbicide treatments, trifluralin, pendimethalin, clomazone, imazaquin, trifluralin + imazaquin and control, were applied, prior to summer cultivation of soybean, in a Dark-Red Latosol (typic Haplustox). Soybean cultivar BR 9 Savana was grown and soil samples were collected at 15, 38, 100, 145 and 206 days after treatment and stored at -5oC. Bioassays were conducted in greenhouse, using quinoa, cultivar Q18. Imazaquin was the most harmful to quinoa seedlings, up to 206 days after application, followed by clomazone 15-38 days after application; trifluralin and pendimethalin had no residual effect. These results suggest that a broad-base screening should be conducted.
DOI: http://dx.doi.org/10.1590/S0100-204X2003000600014
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