Interaction between Thermotolerant Coliforms and Rhizobacteria in Soil Fertilized with Treated Domestic Wastewater

Paulo Fortes Neto,Nara Lúcia Perondi Fortes,Fabiana Brambatti,Eliana Maria De Araújo Mariano Da Silva Silva

doi:10.1590/18069657rbcs20160109

Paulo Fortes Neto, Nara Lúcia Perondi Fortes + Show 2 more

Open Access

https://doi.org/10.1590/18069657rbcs20160109

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Abstract

ABSTRACT Studies on the survival of pathogenic microorganisms in the soil after use of wastewater for fertilization of agricultural crops report the effects of moisture, pH, organic matter, and soil temperature on microorganisms. There are few studies that assess the survival of these microorganisms in the rhizosphere of plants fertilized with wastewater. Thus, the aim of this study was to quantify the number of fecal coliforms and rhizobacteria (fluorescent Pseudomonas spp., Bacillus spp,) in the rhizosphere of winter and summer [...]

Highlights

Adding treated wastewater to agricultural areas has provided benefits: partial substitution of chemical fertilizers, increases in yield, and savings in the amount of water directed to irrigation
The aim of this study was to quantify the number of fecal coliforms and rhizobacteria in the rhizosphere of winter and summer crops fertilized with wastewater
It improves soil physical and biological conditions through the addition of organic matter, and, at the same time, solves the problem of final disposal of the wastewater (Medeiros et al, 2005; Fonseca et al, 2007). In spite of these benefits, care must be exercised in agricultural use because, if, on the one hand, the chemical characteristics of wastewater are favorable to reutilization, on the other hand, it should not be forgotten that even when treated, wastewater still contains pathogenic microorganisms, and continuous use may contaminate the soil with these microorganisms (Hespanhol, 2009)

Summary

Introduction

Adding treated wastewater to agricultural areas has provided benefits: partial substitution of chemical fertilizers, increases in yield, and savings in the amount of water directed to irrigation It improves soil physical and biological conditions through the addition of organic matter, and, at the same time, solves the problem of final disposal of the wastewater (Medeiros et al, 2005; Fonseca et al, 2007). The rhizosphere environment is quite complex, due to the release of exudates, secretion, mucilages, and cell lysates that contain various organic substrates, vitamins, and hormones These compounds, after being released by the roots, are used by microorganisms, causing what is known as the rhizospheric effect, which is an increase in the activity and change in the microbial community in the rhizosphere (Cardoso and Nogueira, 2007)

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