The Effects of Nicosulfuron and Glyphosate on Microbial Activity of Different Soils

• Published in: Advances in Weed Science Vol. 36
• Main Authors: ŠANTRIC, Lj, RADIVOJEVIC, Lj, GAJIC-UMILJENDIC, J., SARIC-KRSMANOVIC, M., ÐUROVIC-PEJCEV, R.
• Format: Journal Article
• Language: English
• Published: Jaboticabal Sociedade Brasileira da Ciência das Plantas Daninhas, UFV - Depto de Fitotecnia 01.01.2018; Sociedade Brasileira da Ciência das Plantas Daninhas
• Subjects: Adsorption; Agricultural management; Biological activity; Biomass; Carbon; Chemical properties; Dehydrogenase; Dehydrogenases; Ecosystems; Enzymes; Experiments; Glyphosate; Herbicides; herbicides, loam; Homogenization; Loam; Microbial activity; Microorganisms; Mineralization; Nitrogen; Organic chemistry; Parameters; Pesticides; PLANT SCIENCES; sand, dehydrogenase, urease, biomass carbon; Sandy soils; Soil investigations; Soil microorganisms; Soil sciences; Soil testing; Soil types; Urease; Working groups; United States > US; areia; carbono da biomassa; argila; herbicides, loam; sand, dehydrogenase, urease, biomass carbon; desidrogenase; urease; herbicidas
• ISSN: 0100-8358; 1806-9681; 1806-9681; 2675-9462
• DOI: 10.1590/s0100-83582018360100103

The effects of the nicosulfuron and glyphosate herbicides on microbial activity in two soils with different physical and chemical properties (loam and sand) were investigated. Nicosulfuron was applied at the rates of 0.3, 0.6, 3.0 and 30.0 mg kg-1 soil and glyphosate at 32.6, 65.2, 326.0 and 3260.0 mg kg-1 soil in the laboratory. Changes in dehydrogenase and urease activity, as well as in microbial biomass carbon, were examined. Samples for the analysis were collected at 3, 7, 14, 30 and 45 days after herbicide application. The results showed that the effects of nicosulfuron and glyphosate depended on treatment rate, duration of activity, test parameters and soil types. In general, application of the herbicides significantly increased the activity of dehydrogenase and urease. Nicosulfuron had a stimulating activity on microbial biomass carbon in loam, while both herbicides demonstrated negative effects on the parameter in the sandy soil. RESUMO: Foram investigados os efeitos dos herbicidas nicosulfuron e glifosato na atividade microbiana em dois solos com diferentes propriedades físicas e químicas (argiloso e arenoso). O nicosulfuron foi aplicado em laboratório nas doses de 0,3, 0,6, 3,0 e 30,0 mg kg-1 solo, e o glifosato, a 32,6, 65,2, 326,0 e 3.260,0 mg kg-1 solo. Foram examinadas alterações na atividade da desidrogenase e da urease, bem como no carbono de biomassa microbiana. As amostras para análise foram recolhidas aos 3, 7, 14, 30 e 45 dias após a aplicação do herbicida. Os resultados mostraram que os efeitos do nicosulfuron e do glifosato dependeram da dose de tratamento, da duração da atividade, dos parâmetros do teste e dos tipos de solo. Em geral, a aplicação dos herbicidas resultou em aumento significativo da atividade da desidrogenase e da urease. O nicosulfuron teve uma atividade estimulante sobre o carbono da biomassa microbiana no solo argiloso, e ambos os herbicidas demonstraram efeitos negativos quanto a esse parâmetro no solo arenoso.