Soil microbial biomass and organic matter fractions during transition from conventional to organic farming systems

Santos, Valdeci Bosco dos; Araújo, Ademir Sérgio Ferreira de; Leite, Luiz Fernando Carvalho; Nunes, Luís Alfredo Pinheiro Leal; Melo, Wanderley José de

doi:10.1016/j.geoderma.2011.11.007

Cited by 163 publications

(91 citation statements)

References 30 publications

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“…The U90 treatment presented the lowest values on these last two dates of soil collection. Although the MB-C values found are lower than those usually reported in the literature (Guerrero et al, 2007), they are in accordance with studies carried out in Brazil (Santos et al, 2012) and other countries (Liu et al, 2013). The differences in MB-C values can be explained by the fact that the soil microbial biomass is highly variable, dependent on environmental conditions such as the soil type, climate, and culture (Moreira & Siqueira, 2006).…”

Section: Resultssupporting

confidence: 88%

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: Resultssupporting

confidence: 88%

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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“…an indicator of stress, and by low soil microbial biomass. This indicates that soil microorganisms are severely limited by low resource availability (Nunes et al 2012;Araújo et al 2013). On the other hand, the HD plot showed high soil microbial biomass and activity, suggesting higher availability of organic residues driven by high inputs of plant litter.…”

Section: Discussionmentioning

confidence: 99%

Soil microbial biomass in an agroforestry system of Northeast Brazil

Rodrigues

Araújo

Costa

et al. 2015

Trop Grass - Forr Trop

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Agroforestry systems (AFS) are considered alternative land use options to help prevent soil degradation and improve soil microbial biomass and organic C status. However, it is unclear how different densities of babassu palm [Attalea speciosa (syn. Orbignya phalerata)], which is an important tree in Northeast Brazil, affect the soil microbial biomass. We investigated the soil microbial biomass C and activity under AFS with different densities of babassu palm associated with Brachiaria brizantha grass. Soil microbial biomass C (MBC), soil microbial biomass N (MBN), MBC:total organic C ratio, fluorescein diacetate hydrolysis and dehydrogenase activity showed highest values in plots with high density of babassu palm. On the other hand, the respiratory quotient (qCO 2 ) was significantly greater in plots without babassu palm. Brachiaria brizantha in monoculture may promote C losses from the soil, but AFS with high density of babassu palm may increase the potential of soils to accumulate C. ResumenLos sistemas agroforestales (AFS, por sus siglas en inglés) son opciones alternativas de uso de la tierra que ayudan a prevenir la degradación del suelo y mejorar la biomasa microbiana y el estado del carbono (C) orgánico. Babasú [Attalea speciosa (syn. Orbignya phalerata)] es una importante palma nativa que forma bosques en los estados Maranhão y Piauí, nordeste de Brasil; no obstante no se conoce su efecto sobre la biomasa microbiana del suelo cuando crece en diferentes densidades. En el estudio se evaluaron los efectos sobre el C y la actividad de la biomasa microbiana del suelo en AFS con 3 densidades de babasú en pasturas de Brachiaria brizantha. El C y el nitrógeno de la biomasa microbiana (MBC resp. MBN) del suelo, la relación de MBC:C orgánico total del suelo, la hidrólisis de diacetato de fluoresceína y la actividad de la deshidrogenasa mostraron valores más altos en las parcelas con alta densidad de babasú. Por otra parte, el cociente respiratorio (qCO2) fue significativamente mayor en las parcelas sin babasú. El pasto B. brizantha en monocultivo puede promover la pérdida de C del suelo, pero los AFS con alta densidad de la palma pueden aumentar el potencial de los suelos para acumular C.

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“…Chemical fertilizers are mainly a mixture of substances, such as nitrogen, phosphorus and potassium. The excess uses of chemical fertilizers in agriculture are costly and also have various harmful effects [1]. For instance, residual chemicals reach to water bodies through rainwater and cause eutrophication in water bodies.…”

Section: Introductionmentioning

confidence: 99%

Effect of Chlorella as a Biofertilizer on Germination of Wheat and Barley Grains

Bold

Tserendulam

2017

Proc. Mong. Acad. Sci.

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Soil microbial biomass and organic matter fractions during transition from conventional to organic farming systems

Cited by 163 publications

References 30 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

Soil microbial biomass in an agroforestry system of Northeast Brazil

Effect of Chlorella as a Biofertilizer on Germination of Wheat and Barley Grains

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