Complexação de íons de metais por matéria orgânica dissolvida: modelagem e aplicação em sistemas reais

Bezerra, Paulo Sergio Silva; Takiyama, Luís Roberto; Bezerra, Cícero Wellington Brito

doi:10.1590/s0044-59672009000300019

Cited by 21 publications

(9 citation statements)

References 15 publications

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“…The reduction in the concentration of Cu in comparison to the plot that received mineral fertilization may be related to complexation of this element by organic matter Rev Bras Cienc Solo 2016;40:e0150385 (Bezerra et al, 2009). In contrast, one of the hypotheses for an increase in Zn is that this can be attributed to the concentration of Zn in the organic compost (Souza et al, 2012).…”

Section: Resultsmentioning

confidence: 99%

Use of Organic Compost Containing Waste from Small Ruminants in Corn Production

Souza

Melo

Primo

et al. 2016

Rev. Bras. Ciênc. Solo

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ABSTRACT:Composting is a useful way of transforming livestock waste into organic fertilizer, which is proven to increase soil nutrient levels, and thus crop yield. Remains from production and slaughter of small ruminants can become a source of important elements for plant growth, such as N, after microorganism-driven decomposition.The aim of this investigation was to evaluate the effects of this compost on soil fertility and on the nutritional status and yield of the corn crop. The experiment was conducted in a Haplic Luvisol in a randomized block design with six treatments and five application rates of the organic compound in Mg ha -1 : 3 (half the standard rate), 6 (standard rate), 9 (one and a half times the standard rate), 12 (twice the standard rate), and 24 (four times the standard rate) and an additional treatment with mineral fertilizers (110, 50 e 30 kg ha -1 of N, P 2 O 5 and K 2 O, respectively), with four blocks. Evaluations were performed for two harvests of rainfed crops, measuring soil fertility, nutritional status, and grain yield. The compost increased P, K, Na and Zn values in the 0.00-0.20 m layer in relation of mineral fertilization in 616, 21, 114 and 90 % with rate 24 Mg ha -1 in second crop. Leaf N, Mg, and S contents, relative chlorophyll content, and the productivity of corn kernels increased in 27, 32, 36, 20 e 85 %, respectively, of low rate (3 Mg ha -1 ) to high rate (24 Mg ha -1 ) with of application of the compost. Corn yield was higher with application of organic compost in rate of 24 Mg ha -1 than mineral fertilizer combination in second crop.

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Section: Resultsmentioning

confidence: 99%

Use of Organic Compost Containing Waste from Small Ruminants in Corn Production

Souza

Melo

Primo

et al. 2016

Rev. Bras. Ciênc. Solo

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“…The opening and closing of the dam gates is irregular, which hinders the water level control up to 4 meters (PITOMBEIRA;MORAIS, 1977). Studies about the microphytoplankton community are scarce, unlike the ones about the use and occupation of soil, degradation and availability of water resources, geomorphology and rehabilitation of degraded areas (CARVALHO et al, 2000;POTAZIO et al, 2004;RIBEIRO et al, 2005;DAMÁZIO, 2006;ANDRADE;CASTRO, 2007;ROJAS et al, 2007;BEZERRA et al, 2009;SILVA et al, 2014). In this context, this study was established as the first record of the phytoplankton in that area, in order to evaluate the spatial and temporal variation of that community and its relationship with environmental parameters over an annual cycle.…”

Section: Introductionmentioning

confidence: 99%

Spatial and seasonal variation of microphytoplankton community and the correlation with environmental parameters in a hypereutrophic tropical estuary - Maranhão - Brazil

et al. 2017

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Duarte-dos-Santos et al.: Spatial-seasonal variation of microphytoplankton 356 Spatial and seasonal variation of microphytoplankton community and the correlation with environmental parameters in a hypereutrophic tropical estuary -Maranhão -BrazilThe Bacanga River Estuary has a hydrodynamic behavior and its tidal flow is limited by a dam. It is considered as a hypertrophic environment that receives daily high loads of domestic sewage without treatment. This study aimed to evaluate the spatial and temporal variation of phytoplankton community and its relationship with environmental parameters. Bi-monthly sampling campaigns were carried out at six fixed sites between 2012 and 2013. Physical-chemical and biological parameters were collected (chlorophyll a, phytoplankton composition and abundance) to perform the statistical correlations. The results indicate that phytoplankton community is mostly represented by diatoms, with Skeletonema costatum being the dominant species responsible for bloom in April and June of 2012. The dominance of this species is related to the high silicate concentrations, pH and turbidity. Other blooms events as well as the Euglena gracilis and Chlamydomonas sp. were recorded in February 2013, when the total phosphorus concentrations were high and the dissolved oxygen concentrations were higher. Dinoflagellates, cyanobacteria and diatom Thallassiosira sp. were widely distributed in the dry period and highly correlated with salinity, water transparency and nutrients. Hence, the distribution of phytoplankton community is more defined seasonally, rather than spatially. AbstrActDescriptors: Algal bloom, Microalgae, Nutrients.O estuário do rio Bacanga apresenta um comportamento hidrodinâmico com fluxo de marés limitado por uma barragem. Ele é considerado como um ambiente hipereutrófico que recebe diariamente altas cargas de esgoto doméstico sem tratamento. Este trabalho teve como objetivo avaliar a variação espaço-sazonal da comunidade fitoplanctônica e suas relações com parâmetros ambientais. Amostragens bimestrais foram realizadas em seis pontos fixos entre 2012 e 2013, obtendo valores dos parâmetros físico-químicos e biológicos (clorofila a, composição e abundância do fitoplâncton) para realização das análises estatísticas. Os resultados indicam que a comunidade fitoplanctônica é representada por diatomáceas, sendo Skeletonema costatum a espécie dominante responsável por pulsos de florações em abril e junho de 2012. O predomínio dessa espécie está relacionado aos elevados teores de silicato, pH e turbidez da água. Outros eventos de florações como da Euglena gracilis e Chlamydomonas sp. foram registrados em fevereiro de 2013, quando os teores de fósforo total estiveram elevados e as taxas de oxigênio dissolvido foram superiores. Os dinoflagelados, cianobactérias e a diatomácea Thallassiosira sp. apresentaram ampla distribuição no período de estiagem e estão altamente correlacionados com a salinidade, transparência da água e nutrientes. Desta forma, a distribuição da comunidade fitoplanctônica é ...

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“…Several authors have stressed the importance of organic matter in determining soil quality because it influences, among other properties, the stability of the aggregates and the structure of the soil (HICKMANN et al, 2012;RAMOS et al, 2013); the rate of water infiltration and retention (RAWLS et al, 2003); biological activity and cation exchange capacity (SILVA; MENDONÇA, 2007); the complexation of metals (BEZERRA et al, 2009); the cycling and availability of nutrients to plants (SILVA et al, 2009); and the release of CO 2 and other gases (LAL;BRUCE, 1999).…”

Section: Introductionmentioning

confidence: 99%

Organic Carbon and Total Nitrogen in the Densimetric Fractions of Organic Matter Under Different Soil Management

et al. 2016

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-The evaluation of land use and management by the measurement of soil organic matter and its fractions has gained attention since it helps in the understanding of the dynamics of their contribution to soil productivity, especially in tropical environments. This study was conducted in the municipality of Colorado do Oeste, state of Rondônia, Brazil and its aim was to determinethe quantity of organic carbon and total nitrogen in the light and heavy fractions of organic matter in the surface layers of a typic hapludalf under different land use systems: Native Forest: open evergreen forest, reference environment; Agroforestry System 1: teak (Tectona grandis LF) and kudzu (Pueraria montana); Agroforestry System 2: coffee (Coffea canephora), marandu palisade grass (Brachiaria brizantha cv. Marandu), "pinho cuiabano" (Parkia multijuga), teak and kudzu.; Agroforestry System 3: teak and cocoa (Theobroma cacao); Silvopasture System: teak, cocoa and marandu palisade grass; and Extensive Grazing System: marandu palisade grass. The experimental design was a randomized block in split-split plots (use systems versus soil layers of 0-0.05 and 0.05-0.10 m) with three replications. The results showed that relative to Native Forest, the Agroforestry System 2 had equal-and greater amounts of organic carbon and total nitrogen respectively (light and heavy fractions) in the soil organic matter, with the light fraction being responsible for storage of approximately 45% and 70% of the organic carbon and total nitrogen, respectively. Therefore, the light densimetric fraction proved to be useful in the early identification of the general decline of the soil organic matter in the land use systems evaluated.Keywords: Silvopasture system. Agroforestry system. Forest cultivation. CARBONO ORGÂNICO E NITROGÊNIO TOTAL NAS FRAÇÕES DENSIMÉTRICAS DA MATÉRIA ORGÂNICA SOB DIFERENTES MANEJOS DO SOLORESUMO -A avaliação de sistemas de uso e manejo dos solos por meio da matéria orgânica e seus compartimentos tem ganhado apelo, pois ajuda a entender a dinâmica do seu aporte, principalmente em ambientes tropicais. Objetivou-se neste trabalho determinar, no município de Colorado do Oeste, Rondônia, a alteração do carbono orgânico e nitrogênio total nas frações leve e pesada da matéria orgânica da camada superficial de um ARGISSOLO VERMELHO-AMARELO Eutrófico típico sob diferentes usos do solo: Floresta nativa (FN): Floresta Ombrófila Aberta, como ambiente referência; sistema agroflorestal 1: teca (Tectona grandis L. F.) e kudzu (Pueraria montana); sistema agroflorestal 2: café (Coffea canephora), pastagem (Brachiaria brizantha cv. Marandu), pinho cuiabano (Parkia multijuca), teca e kudzu; Sistema agrossilvopastoril: Teca, cacau (Theobroma cacao) e pastagem; sistema agroflorestal 3: Teca e cacau; pastagem extensiva: (B. brizantha cv. Marandu). O delineamento empregado foi o de blocos casualizados em esquema de parcelas subdivididas (diferentes coberturas vegetais versus camadas de solo à 0-0,05 e a 0,05-0,10 m) com três repetições. Verificou-se que:...

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Complexação de íons de metais por matéria orgânica dissolvida: modelagem e aplicação em sistemas reais

Cited by 21 publications

References 15 publications

Use of Organic Compost Containing Waste from Small Ruminants in Corn Production

Use of Organic Compost Containing Waste from Small Ruminants in Corn Production

Spatial and seasonal variation of microphytoplankton community and the correlation with environmental parameters in a hypereutrophic tropical estuary - Maranhão - Brazil

Organic Carbon and Total Nitrogen in the Densimetric Fractions of Organic Matter Under Different Soil Management

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