Soil conservation management with cover crops: effects on critical energy levels, release and dispersion of aggregates

Detalhes bibliográficos
Autor(a) principal: Silva,Érika Andressa da
Data de Publicação: 2019
Outros Autores: Reinert,Dalvan José, Reichert,José Miguel, Mallmann,Micael Stolben, Pereira,Monike Andrade, Pons,Sarah Severo, Foggiato,William Saidelles
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Bragantia
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000300444
Resumo: ABSTRACT The normalized dispersion index (NDI) and the b/a index are commonly used to express the stability of aggregates measured by ultrasound. However, few studies have used the critical energy (CE) extracted from modeling to explain the effects of soil use and management on soil aggregation. The objective of this study was to evaluate the influence of soil cover on the CE level required for dispersion of aggregates of a Typic Hapludalf. Soil samples collected from the 0.0-0.05 m depth were evaluated in five different managements with cover plants: perennial soybean (PS), peanuts (P), spontaneous vegetation (SV), black oat/forage turnip (BOFT), and black oat/hairy vetch (BOHV). Aggregates ? 2 mm of the treatments were exposed to ultrasonic irradiation during 0, 30, 60, 120 and 180 s. The specific applied energies were calculated based on sonification time and potency: 0, 745, 1490, 2980, and 4470 J·g–1. After each sonification, sand (2000-53 ?m), silt (53-2 ?m) and clay (< 2 ?m) were quantified. The mass of aggregates of each size class was modeled as a function of the ultrasonic energy. The CE, the NDI and the b/a indexes were coefficients extracted from these models. Cover crops influenced the critical energy levels required for dispersion of aggregates of the Typic Hapludalf. However, our methodology did not prove management systems with intercrops of the cover crops, as black oats and vetch, contribute more effectively to the increase of soil aggregation.
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spelling Soil conservation management with cover crops: effects on critical energy levels, release and dispersion of aggregatesultrasonic dispersionaggregation modelsleguminousgrassesABSTRACT The normalized dispersion index (NDI) and the b/a index are commonly used to express the stability of aggregates measured by ultrasound. However, few studies have used the critical energy (CE) extracted from modeling to explain the effects of soil use and management on soil aggregation. The objective of this study was to evaluate the influence of soil cover on the CE level required for dispersion of aggregates of a Typic Hapludalf. Soil samples collected from the 0.0-0.05 m depth were evaluated in five different managements with cover plants: perennial soybean (PS), peanuts (P), spontaneous vegetation (SV), black oat/forage turnip (BOFT), and black oat/hairy vetch (BOHV). Aggregates ? 2 mm of the treatments were exposed to ultrasonic irradiation during 0, 30, 60, 120 and 180 s. The specific applied energies were calculated based on sonification time and potency: 0, 745, 1490, 2980, and 4470 J·g–1. After each sonification, sand (2000-53 ?m), silt (53-2 ?m) and clay (< 2 ?m) were quantified. The mass of aggregates of each size class was modeled as a function of the ultrasonic energy. The CE, the NDI and the b/a indexes were coefficients extracted from these models. Cover crops influenced the critical energy levels required for dispersion of aggregates of the Typic Hapludalf. However, our methodology did not prove management systems with intercrops of the cover crops, as black oats and vetch, contribute more effectively to the increase of soil aggregation.Instituto Agronômico de Campinas2019-09-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000300444Bragantia v.78 n.3 2019reponame:Bragantiainstname:Instituto Agronômico de Campinas (IAC)instacron:IAC10.1590/1678-4499.20180323info:eu-repo/semantics/openAccessSilva,Érika Andressa daReinert,Dalvan JoséReichert,José MiguelMallmann,Micael StolbenPereira,Monike AndradePons,Sarah SeveroFoggiato,William Saidelleseng2019-10-09T00:00:00Zoai:scielo:S0006-87052019000300444Revistahttps://www.scielo.br/j/brag/https://old.scielo.br/oai/scielo-oai.phpbragantia@iac.sp.gov.br||bragantia@iac.sp.gov.br1678-44990006-8705opendoar:2019-10-09T00:00Bragantia - Instituto Agronômico de Campinas (IAC)false
dc.title.none.fl_str_mv Soil conservation management with cover crops: effects on critical energy levels, release and dispersion of aggregates
title Soil conservation management with cover crops: effects on critical energy levels, release and dispersion of aggregates
spellingShingle Soil conservation management with cover crops: effects on critical energy levels, release and dispersion of aggregates
Silva,Érika Andressa da
ultrasonic dispersion
aggregation models
leguminous
grasses
title_short Soil conservation management with cover crops: effects on critical energy levels, release and dispersion of aggregates
title_full Soil conservation management with cover crops: effects on critical energy levels, release and dispersion of aggregates
title_fullStr Soil conservation management with cover crops: effects on critical energy levels, release and dispersion of aggregates
title_full_unstemmed Soil conservation management with cover crops: effects on critical energy levels, release and dispersion of aggregates
title_sort Soil conservation management with cover crops: effects on critical energy levels, release and dispersion of aggregates
author Silva,Érika Andressa da
author_facet Silva,Érika Andressa da
Reinert,Dalvan José
Reichert,José Miguel
Mallmann,Micael Stolben
Pereira,Monike Andrade
Pons,Sarah Severo
Foggiato,William Saidelles
author_role author
author2 Reinert,Dalvan José
Reichert,José Miguel
Mallmann,Micael Stolben
Pereira,Monike Andrade
Pons,Sarah Severo
Foggiato,William Saidelles
author2_role author
author
author
author
author
author
dc.contributor.author.fl_str_mv Silva,Érika Andressa da
Reinert,Dalvan José
Reichert,José Miguel
Mallmann,Micael Stolben
Pereira,Monike Andrade
Pons,Sarah Severo
Foggiato,William Saidelles
dc.subject.por.fl_str_mv ultrasonic dispersion
aggregation models
leguminous
grasses
topic ultrasonic dispersion
aggregation models
leguminous
grasses
description ABSTRACT The normalized dispersion index (NDI) and the b/a index are commonly used to express the stability of aggregates measured by ultrasound. However, few studies have used the critical energy (CE) extracted from modeling to explain the effects of soil use and management on soil aggregation. The objective of this study was to evaluate the influence of soil cover on the CE level required for dispersion of aggregates of a Typic Hapludalf. Soil samples collected from the 0.0-0.05 m depth were evaluated in five different managements with cover plants: perennial soybean (PS), peanuts (P), spontaneous vegetation (SV), black oat/forage turnip (BOFT), and black oat/hairy vetch (BOHV). Aggregates ? 2 mm of the treatments were exposed to ultrasonic irradiation during 0, 30, 60, 120 and 180 s. The specific applied energies were calculated based on sonification time and potency: 0, 745, 1490, 2980, and 4470 J·g–1. After each sonification, sand (2000-53 ?m), silt (53-2 ?m) and clay (< 2 ?m) were quantified. The mass of aggregates of each size class was modeled as a function of the ultrasonic energy. The CE, the NDI and the b/a indexes were coefficients extracted from these models. Cover crops influenced the critical energy levels required for dispersion of aggregates of the Typic Hapludalf. However, our methodology did not prove management systems with intercrops of the cover crops, as black oats and vetch, contribute more effectively to the increase of soil aggregation.
publishDate 2019
dc.date.none.fl_str_mv 2019-09-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000300444
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000300444
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/1678-4499.20180323
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Instituto Agronômico de Campinas
publisher.none.fl_str_mv Instituto Agronômico de Campinas
dc.source.none.fl_str_mv Bragantia v.78 n.3 2019
reponame:Bragantia
instname:Instituto Agronômico de Campinas (IAC)
instacron:IAC
instname_str Instituto Agronômico de Campinas (IAC)
instacron_str IAC
institution IAC
reponame_str Bragantia
collection Bragantia
repository.name.fl_str_mv Bragantia - Instituto Agronômico de Campinas (IAC)
repository.mail.fl_str_mv bragantia@iac.sp.gov.br||bragantia@iac.sp.gov.br
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