Abstract
ABSTRACT Swine wastewater (SW) application in agricultural soils may affect its microbial community in a long term. The objective of this study was to evaluate prospective changes in soil bacterial community after eight years continuous application of swine wastewater. The wastewater doses tested were 0; 100; 200 and 300 m3 ha-1, being applied from the beginning of the experiment and with or without recommended fertilization. Three soil samples were taken from each plot for determinations of basal respiration, microbial biomass and metabolic quotient. We also performed DGGE analysis and made a correlation between soil chemical conditions and microbial activity. Microbial community underwent significant structural changes from swine wastewater applications. Higher SW doses (200 and 300 m3 ha-1) influenced significantly (p <0.05) and benefitted certain bacteria groups.
Highlights
Population growth and climate changes in the recent decades have prompted the search for new methods and techniques of minimizing consumption and optimizing use of water and otherSilv io.samp aio@unioest e.br 3 Tecnólogo em gerenciamento ambiental, Doutorando, Programa de Pós-Graduação em Engenharia A grícola, UNIOESTE, Eng
This study aimed to evaluate the quantitative effects and qualitative (DGGE, correlation between soil chemical conditions and microbial activity) in the soil bacterial community from the Swine wastewater (SW) application associated with mineral fertilization
Soil bacterial communities were evaluated for quantitative factors such as basal respiration (BR), soil microbial biomass (SMB) and qCO2 and qualitative as biodiversity by the Denaturing Gradient Gel (DGGE) technique, correlation between the soil physical and chemical parameters and the bacterial community and indexes of Shannon (H), Evenness (E) and abundance (ACE)
Summary
Population growth and climate changes in the recent decades have prompted the search for new methods and techniques of minimizing consumption and optimizing use of water and otherSilv io.samp aio@unioest e.br 3 Tecnólogo em gerenciamento ambiental, Doutorando, Programa de Pós-Graduação em Engenharia A grícola, UNIOESTE, Eng. Population growth and climate changes in the recent decades have prompted the search for new methods and techniques of minimizing consumption and optimizing use of water and other. Long-term effects of swine wastewater and mineral fertilizer association on soil microbiota natural resources. Livestock wastewater application in farm irrigation contributes to the conservation of water resources, the long-term improvement of soil quality and the reduction of fertilization costs (SAMPAIO et al, 2010; MEDEIROS et al, 2011; MAGGI et al, 2013; BATISTA et al, 2014). Like any unconsolidated technique, the use of wastewater of animal origin may generate adverse effects on the physical, chemical and biological composition of the environment. The biological one stands out in the context of animal and human health. Studies associated with microorganisms from these residues and the soil are complex and multifactorial, since the size, the activity, the structure and the diversity of microbial communities in the soil are affected by various biotic and abio tic factors (ROUSK et al 2010; CUNHA et al, 2012)
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