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Mostrando ítems 1421-1430 de 3933
Efeitos da época sobre os processos ecológicos em viveiros escavados para criação extensiva de tilápias no Sudeste do Brasil
(2015-11-01)
In Southeastern Brazil tilapia culture is conducted in extensive and semi-intensive flow-through earthen ponds, being water availability and flow management different in the rainy and dry seasons. In this region lettuce ...
Metals and limnological variables in an urban reservoir: compartmentalization and identification of potential impacted areas
(2018-01-01)
Reservoirs in urban areas are used for different purposes and are liable to different types of pressures that can cause the loss of chemical and biological quality, hence diminishing their ecological, economic, and cultural ...
Temporal and Spatial Variability of Limnological Characteristics in Areas under the Influence of Tilapia Cages in the Chavantes Reservoir, Paranapanema River, Brazil
(Wiley-Blackwell, 2013-12-01)
The influence of tilapia cages on limnological characteristics of the Chavantes Reservoir, Paranapanema River, Brazil, was investigated in March and June 2007. Principal components analysis was used to compare the transparency; ...
Efeito da aplicação de água residuária de suinocultura no solo e na qualidade dos seus lixiviados
(2012-10-01)
This study evaluates the behavior of swine effluent for their effects on soil and the quality of the leachate. In the incubation of soil with effluent were used 48 units in total with experimental application rates of 0, ...
Spatial variability of chemical pedoindicators in Haplic Inceptisol under different management systems in southern Amazonas state, Brazil
(2018-08-01)
Inceptisols are poorly developed soils with original material characteristics and high or low base saturation depending on the environment in which they developed. This study aimed to evaluate the spatial variability of ...
Delineation of management zones in integrated crop–livestock systems
(2021-01-01)
The lack of studies on spatial variability in integrated crop–livestock systems (ICLS) hinders understanding how to increase their efficiency by implementing precision agriculture (PA) practices. As such, little is known ...
Impacto das atividades de aqüicultura e sistemas de tratamento de efluentes com macrófitas aquáticas – relato de caso
(Inst Pesca, 2008-01-01)
Aquaculture effluents are enriched by nitrogen, phosphorus and organic matter and contribute to increase eutrophication of the receiving water bodies and reduction or change in biodiversity. To reduce effluent loading is ...
Hypersaline tidal flats as important "blue carbon" systems: A case study from three ecosystems
(Copernicus Publications, 2021)
Hypersaline tidal flats (HTFs) are coastal ecosystems with freshwater deficits often occurring in arid or semiarid regions near mangrove supratidal zones with no major fluvial contributions. Here, we estimate that organic ...
The impact of applications of sugar cane filter cake and vinasse on soil fertility factors in fields having four different crop rotations practices in Brazil
(2018-01-01)
In this study we examined how the use of vinasse and filter cake as fertilizers at four different sites alters crop yields of sugarcane. The objective was to determine the impacts based on the products fertility and to ...
Temporal dynamics of water quality in an urban streamDinâmica temporal da qualidade da água em um córrego urbano
(2021-01-01)
Urbanization leads to the addition of areas of low permeability in watersheds, which results in an increase in the volume of rainwater drained superficially and, consequently, in the expansion of pollutants carried to the ...