Mycorrhizal Association and Microbial Activity of Soil Cultivated with Cassava After Application of Mesotrione and Fluazifop-p-Butyl

Planta Daninha

Freitas, M.S.¹  Universidade Federal de Viçosa, Rio Paranaíba, Brasil¹  Ferreira, E.A.¹  Silva, D.V.¹  Melo, C.A.D.¹  Silveira, H.M.¹  Saraiva, D.T.¹  Neto, M.D.C.¹  Universidade Federal de Viçosa, Viçosa, Brasil¹  Instituto Federal do Tocantins, Lagoa da Confusão, Brasil¹  Silva, A.A.¹  Universidade Federal do Vale do Jequitinhonha e Mucuri, Diamantina, Brasil¹ 

关键词: microbial biomass;    arbuscular mycorrhizal fungi;    herbicide;    Manihot esculenta;   

DOI  :  10.1590/0100-83582015000200013

学科分类：农业科学（综合）

来源: Sociedade Brasileira da Ciencia das Plantas Daninhas (S B C P D) / Brazilian Society of Herb Science

【 摘 要 】

Soil is a very heterogeneous environment that allows the establishment of wide range of microorganisms populations, whose balance is affected by biotic and abiotic factors. This study has aimed to assess the effect of doses of mesotrione and fluazifop-p-butyl herbicides and two assessment periods on microbial activity and biomass of soil cultivated with cassava Cacau-UFV cultivar, besides the root colonization by arbuscular mycorrhizal fungi. Two trials were conducted in a protected environment where was realized post-emergence application of mesotrione in the doses of 72, 108, 144 and 216 g ha-1 and fluazifop-p-butyl in the doses of 100, 150, 200 and 300 g ha-1, besides a control without application. Soil samples were collected for determination of soil respiratory rate (RR), microbial biomass carbon (MBC), metabolic quotient (qCO2), and colonization of roots by arbuscular mycorrhizal fungi at the 30 and 60 days after applications (DAA) of the herbicides. Fluazifop-p-butyl increased the RR, MBC and the percentage of cassava roots colonized by mycorrhizal fungi in the assessment performed at 60 DAA. The larger effects of mesotrione on soil microbial indicators were up to 30 DAA, being the changes minimized at 60 DAA. It is concluded that the herbicides alter the soil microbial indicators, with effects dependent of the product, of dose applied and also of the period of assessment.

【 授权许可】

Unknown