ACTIVITY OF RHIZOSPHERE SOIL MICROORGANISMS OF SUGARCANE CULTIVARS AFTER SPRAYING OF HERBICIDES: DIURON, TEBUTHIURON, AMETRYN AND DIURON + HEXAZINONE

Authors

  • Autieres Teixeira Faria Department of Crop Production, Universidade Federal de Viçosa, Viçosa, MG http://orcid.org/0000-0003-3134-030X
  • Beatriz Fernandes de Seia Gonçalves Department of Crop Production, Universidade Federal de Viçosa, Viçosa, MG http://orcid.org/0000-0003-1828-1608
  • Douglas Teixeira Saraiva Department of Crop Production, Universidade Federal de Viçosa, Viçosa, MG http://orcid.org/0000-0002-8366-7331
  • Matheus de Freitas Souza Department of Crop Production, Universidade Federal Rural do Semi-Árido, Mossoró, RN http://orcid.org/0000-0002-5424-6028
  • Antonio Alberto da Silva Department of Crop Production, Universidade Federal de Viçosa, Viçosa, MG
  • Daniel Valadão Silva Department of Crop Production, Universidade Federal Rural do Semi-Árido, Mossoró, RN http://orcid.org/0000-0003-0644-2849

DOI:

https://doi.org/10.1590/1983-21252018v31n307rc

Keywords:

Rhizosphere. Soil microorganisms. Residual effect.

Abstract

Changes in the agricultural environment can be determined by providing microbiological indicators of the soil since the soil microorganisms are sensitive to variations in the environment. In this way, the impact of herbicides of long residual effect on the rhizospheric soil microorganisms of sugarcane cultivars was evaluated. The cultivars of sugarcane (SP 81-3250 and RB 867515) were treated with four herbicides (tebuthiuron, diuron, ametryn and mixture of diuron + and hexazinone) applied in pre-emergence. The herbicides were applied seven days after the planting of the gems. At 30, 60 and 90 days after the application, the soil rhizosphere was collected in each treatment to determine the CO2 evolution of the soil (C-CO2), microbial biomass carbon (MBC), metabolic quotient (qCO2), solubility potential of inorganic phosphorus P (PSFI) and percentage of roots colonized by mycorrhizal fungi Arbuscular. No changes were observed in the microbial activity of the sugarcane rhizosphere at 30 days after application of the herbicides (DAA). However, at 90 DAA, all herbicides negatively affected the activity of the rhizospheric microorganisms of sugarcane. The metabolic activity of rhizosphere in soil cultivated with RB 867515 was less affected by herbicides.

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Published

28-05-2018

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Section

Agronomy