Utilização de microondas na avaliação da biomassa microbiana do solo

Ferreira, Adão de Siqueira; Camargo, Flávio Anastácio de Oliveira; Vidor, Caio

doi:10.1590/s0100-06831999000400026

Cited by 106 publications

(71 citation statements)

References 14 publications

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“…Subsequently, the MB-C was analyzed in triplicate, subdivided into six subsamples of 30 g, of which three were subjected to radiation in a microwave oven to cause cell lysis. The samples were subjected to microwave radiation for 2 min at 1.62x10 5 J (Ferreira et al, 1999 . The coefficient (Kc) used in the calculation to determine the MB-C was 0.33.…”

Section: Methodsmentioning

confidence: 99%

Microbiological and chemical attributes of a Hapludalf soil with swine manure fertilization

Couto

Comin

Soares

et al. 2013

Pesq. agropec. bras.

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-The objective of this work was to evaluate the microbiological and chemical attributes of a soil with a seven-year history of urea and swine manure application. In the period from October 2008 to October 2009, soil samples were collected in the 0-10 cm layer and were subjected to the treatments: control, without application of urea or manure; and with the application of urea, pig slurry, and deep pig litter in two doses, in order to supply one or two times the recommended N doses for the maize (Zea mays)/black oat (Avena strigosa) crop succession. The carbon of the microbial biomass (MB-C) and the basal respiration (C-CO 2 ) were analyzed, and the metabolic (qCO 2 ) and microbial quotient (qmic) were calculated with the obtained data. Organic matter, pH in water, available P and K, and exchangeable Ca and Mg were also determined. The application of twice the dose of deep pig litter increases the MB-C and C-CO 2 values. The qmic and qCO 2 are little affected by the application of swine manure. The application of twice the dose of deep pig litter increases the values of pH in water and the contents of available P and of exchangeable Ca and Mg in the soil.

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Section: Methodsmentioning

confidence: 99%

Microbiological and chemical attributes of a Hapludalf soil with swine manure fertilization

Couto

Comin

Soares

et al. 2013

Pesq. agropec. bras.

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“…The MBC was determined according to the methodology described by Vance et al (1987), in which chloroform is replaced by a microwave oven (for 4 min) to eliminate microorganisms and release cell components, as suggested by Ferreira et al (1999). For the determination of size distribution of water aggregate stability (mean weighted diameter MWD) a 5 x 5 x 20 cm soil cube was collected (care should be taken to avoid segmentation of the sample in the field) and the sample was identified in the laboratory according to a methodology described by Kemper & Rosenau (1986), calculated as described by Palmeira et al (1999).…”

Section: Methodsmentioning

confidence: 99%

Spatial variability of the chemical, physical and biological properties in lowland cultivated with irrigated rice

Parfitt

Timm

Pauletto³

et al. 2009

Rev. Bras. Ciênc. Solo

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In the areas where irrigated rice is grown in the south of Brazil, few studies have been carried out to investigate the spatial variability structure of soil properties and to establish new forms of soil management as well as determine soil corrective and fertilizer applications. In this sense, this study had the objective of evaluating the spatial variability of chemical, physical and biological soil properties in a lowland area under irrigated rice cultivation in the conventional till system. For this purpose, a 10 x 10 m grid of 100 points was established, in an experimental field of the Embrapa Clima Temperado, in the County of Capão do Leão, State of Rio Grande do Sul. The spatial variability structure was evaluated by geostatistical tools and the number of subsamples required to represent each soil property in future studies was calculated using classical statistics. Results showed that the spatial variability structure of sand, silt, SMP index, cation exchange capacity (pH 7.0), Al3+ and total N properties could be detected by geostatistical analysis. A pure nugget effect was observed for the nutrients K, S and B, as well as macroporosity, mean weighted diameter of aggregates, and soil water storage. The cross validation procedure, based on linear regression and the determination coefficient, was more efficient to evaluate the quality of the adjusted mathematical model than the degree of spatial dependence. It was also concluded that the combination of classical with geostatistics can in many cases simplify the soil sampling process without losing information quality.

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“…O C da biomassa foi determinado segundo Ferreira et al (1999), empregando-se o método da irradiação/ incubação, que apresenta como princípio básico a eliminação de microrganismos por meio da irradiação eletromagnética de forno de microondas, antes da avaliação da quantidade de CO 2 liberada após incubação por 10 dias, 25 °C. A atividade respiratória da biomassa microbiana, ou respiração basal do solo, foi avaliada pela quantificação do CO 2 liberado durante a incubação do solo em sistema fechado, onde o CO 2 foi capturado em solução de NaOH 1 mol L -1 e posteriormente titulada com HCl 1 mol L -1 , segundo método adaptado de Anderson (1982).…”

Section: Avaliação Dos Atributos Microbianos Do Solounclassified

Avaliação da qualidade de solos sob diferentes coberturas florestais e de pastagem no sul de Minas Gerais

Melloni

Alvarenga

et al. 2008

Rev. Bras. Ciênc. Solo

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RESUMONo sul de Minas Gerais faz-se a substituição de florestas de araucária por pastagens ou extensos plantios de eucalipto. No entanto, poucos estudos relacionam, de forma ampla, os impactos nos atributos físicos, químicos, microbianos e visuais do solo causados por esta substituição. Com esse objetivo, selecionaram-se áreas com eucalipto, araucária implantada, mata nativa e pasto implantado em Delfim Moreira, MG, no verão de 2006, de onde se retiraram amostras deformadas e indeformadas de solo para análises químicas (pH, P, K, Ca 2+ , Mg 2+ , Al 3+ , H + Al, SB, t, T, V, m e matéria orgânica), físicas (densidade do solo, densidade de partículas, índice de floculação, diâmetro médio geométrico, macro e microporosidade) e microbianas (atividade microbiana, qCO 2 , C da biomassa microbiana, relação C da biomassa/C orgânico). Com atributos visuais ligados ao solo, às plantas e aos animais, elaborou-se um indicador da qualidade visual para cada ecossistema, que se destacou pela praticidade, simplicidade e sensibilidade na discriminação das diferentes coberturas vegetais. A grande maioria dos atributos físicos e microbianos mostrou-se eficiente nas avaliações da qualidade ambiental, que revelaram grande disparidade entre a pastagem e os demais ecossistemas, e alta similaridade entre o ecossistema eucalipto com sub-bosque desenvolvido e araucária implantada.Termos de indexação: araucária, eucalipto, indicadores da qualidade do solo.

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Utilização de microondas na avaliação da biomassa microbiana do solo

Cited by 106 publications

References 14 publications

Microbiological and chemical attributes of a Hapludalf soil with swine manure fertilization

Microbiological and chemical attributes of a Hapludalf soil with swine manure fertilization

Spatial variability of the chemical, physical and biological properties in lowland cultivated with irrigated rice

Avaliação da qualidade de solos sob diferentes coberturas florestais e de pastagem no sul de Minas Gerais

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