Interferência de herbicidas nas características fisiológicas da mandioca e na atividade microbiana do solo

• Autor(a) principal: Silveira, Hellen Martins da
• Data de Publicação: 2012
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/4628
• topic: Herbicidas; Mandioca; Atividade microbiana; Características fisiológicas; Herbicides; Cassava; Microbial activity; Physiological characteristics; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOTECNIA

In this study evaluated the effects of herbicides mesotrione, fluazifop-p-butyl, fomesafen and fluazifop-p-butyl + fomesafen on physiological characteristics of cassava cultivars, and also the action of mesotrione and fluazifop-p-butyl on microbial activity of rhizosphere of the cultivars. Thus, in four experiments were evaluated: physiological characteristics of cassava cultivars after application of mesotrione; interference of fluazifop-p-butyl and fomesafen in separate and mixture application on water use efficiency and photosynthetic characteristics of cassava cultivars; and the action of mestrione and fluazifop-p-butyl on the microbial activity in the rhizosphere of the Cacau-UFV cultivar at 30 and 60 days after herbicide application. The Platina cultivar was more tolerant to mesotrione and Coqueiro cultivar showed less water use efficiency after applications. The transpiration rate, stomatal conductance and water use efficiency of cassava plants increased according to doses of fomesafen + fluazifop-p-butyl. These effects were not observed when the herbicides were applied separately. The cassava cultivars presented differential tolerance to herbicides fomesafen and fluazifop-p-butyl, and fluazifop-p-butyl was more selective to culture. There was an increase in mycorrhizal colonization of Cacau-UFV roots at 30 days for both herbicides and 60 days only for fluazifop-p- butyl, however, these products did not interfere on qCO2. The cassava crop was more tolerant to mesotrione and fluazifop-p-butyl.