Least limiting water range (LLWR) of Oxisol under native cerrado and minimum soybean tillage

Detalhes bibliográficos
Autor(a) principal: Ramos, Fabricio Tomaz
Data de Publicação: 2012
Outros Autores: Maia, João Carlos de Souza, Roque, Marcio William, Serafim, Milson Evaldo, Azevedo, Emílio Carlos de, Ramos, Denis Tomás
Tipo de documento: Artigo
Idioma: por
Título da fonte: Revista de Ciências Agrárias (Belém. Online)
Texto Completo: https://ajaes.ufra.edu.br/index.php/ajaes/article/view/501
Resumo: Understanding how production systems influence soil structure is important, because excessive compaction represents a major obstacle to water availability to plants. In this context, this study aimed to determine the impact of minimum tillage system in Oxisol under soybean, for eight years in succession, on the physical characteristics of the soil in 0-10, 10-20 and 20-30 cm layers and the correlation of these attributes with the least limiting water range (LLWR). An area of native cerrado was used as reference of soil physical quality.   It was possible to verify that the hypothesis that soil physical properties such as density (Ds) and soil organic matter, wet stable macroaggregates (4-2 mm), determined separately in an attempt to predict possible soil water restrictions for the development of plants imposed by structural degradation is valid, since they were correlated with the LLWR. Compared to native cerrado, soil structural degradation under minimum soybean tillage was more pronounced in the 0-10 cm layer due to higher Ds, lower stability of macroaggregates, organic matter and soil flocculation level, where more than 60% of Ds samples were above the Dscritical (LLWR = 0), resulting in a significantly lower LLWR. Regarding the parameters that define the LLWR, it was possible to observe that, under minimum tillage, there was greater proportion of samples, where θPA and θRP-limit (2.0 or 2.5 MPa) replaced θCC and θPMP, respectively. However, θRP-limit was the main factor for LLWR reduction.
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spelling Least limiting water range (LLWR) of Oxisol under native cerrado and minimum soybean tillageIntervalo hídrico ótimo de um Latossolo Vermelho distrófico sob cerrado nativo e cultivo mínimo com sojaUnderstanding how production systems influence soil structure is important, because excessive compaction represents a major obstacle to water availability to plants. In this context, this study aimed to determine the impact of minimum tillage system in Oxisol under soybean, for eight years in succession, on the physical characteristics of the soil in 0-10, 10-20 and 20-30 cm layers and the correlation of these attributes with the least limiting water range (LLWR). An area of native cerrado was used as reference of soil physical quality.   It was possible to verify that the hypothesis that soil physical properties such as density (Ds) and soil organic matter, wet stable macroaggregates (4-2 mm), determined separately in an attempt to predict possible soil water restrictions for the development of plants imposed by structural degradation is valid, since they were correlated with the LLWR. Compared to native cerrado, soil structural degradation under minimum soybean tillage was more pronounced in the 0-10 cm layer due to higher Ds, lower stability of macroaggregates, organic matter and soil flocculation level, where more than 60% of Ds samples were above the Dscritical (LLWR = 0), resulting in a significantly lower LLWR. Regarding the parameters that define the LLWR, it was possible to observe that, under minimum tillage, there was greater proportion of samples, where θPA and θRP-limit (2.0 or 2.5 MPa) replaced θCC and θPMP, respectively. However, θRP-limit was the main factor for LLWR reduction.  Entender como os sistemas de produção influenciam a estrutura do solo é importante, pois a compactação excessiva representa uns dos principais entraves à disponibilidade de água às plantas. Nesse contexto, objetivou-se determinar o impacto do sistema de cultivo mínimo em um Latossolo Vermelho distrófico sob soja, em sucessão por oito anos, sobre atributos físicos do solo nas camadas 0-10, 10-20 e 20-30 cm, bem como a correlação destes com o intervalo hídrico ótimo (IHO). Uma área de Cerrado nativo foi utilizada como referência de qualidade física do solo. Verificou-se que a hipótese de que atributos físicos do solo – como densidade (Ds) e matéria orgânica do solo, e macroagregados estáveis via úmida (4-2 mm) – determinados isoladamente, na tentativa de prever possíveis restrições de água no solo para o desenvolvimento das plantas impostas pela degradação estrutural, é válida, já que tais atributos foram correlacionados com o IHO. Comparado ao Cerrado nativo, sob cultivo mínimo de soja, a degradação estrutural do solo foi mais pronunciada na camada de 0-10 cm, reflexo da maior Ds, da menor estabilidade de macroagregados, da matéria orgânica e do grau de floculação do solo, em que mais de 60% das amostras de Ds ficaram acima da Dscrítica (IHO = 0), resultando em um IHO significativamente inferior. Quanto aos parâmetros que delimitam o IHO, observou-se que, sob cultivo mínimo, houve maior proporção de amostras em que a θPA e a θRPlimite (2,0 ou 2,5 MPa) substituíram a θCC e a θPMP, respectivamente. No entanto, a θRPlimite foi o fator que mais competiu para a redução do IHO.Universidade Federal Rural da Amazônia/UFRA2012-07-27info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://ajaes.ufra.edu.br/index.php/ajaes/article/view/501Amazonian Journal of Agricultural Sciences Journal of Agricultural and Environmental Sciences; Vol 55 No 2 (2012): RCA; 124-133Revista de Ciências Agrárias Amazonian Journal of Agricultural and Environmental Sciences; v. 55 n. 2 (2012): RCA; 124-1332177-87601517-591Xreponame:Revista de Ciências Agrárias (Belém. Online)instname:Universidade Federal Rural da Amazônia (UFRA)instacron:UFRAporhttps://ajaes.ufra.edu.br/index.php/ajaes/article/view/501/235Ramos, Fabricio TomazMaia, João Carlos de SouzaRoque, Marcio WilliamSerafim, Milson EvaldoAzevedo, Emílio Carlos deRamos, Denis Tomásinfo:eu-repo/semantics/openAccess2017-07-18T19:02:37Zoai:ojs.www.periodicos.ufra.edu.br:article/501Revistahttps://ajaes.ufra.edu.br/index.php/ajaes/PUBhttps://ajaes.ufra.edu.br/index.php/ajaes/oaiallan.lobato@ufra.edu.br || ajaes.suporte@gmail.com2177-87601517-591Xopendoar:2017-07-18T19:02:37Revista de Ciências Agrárias (Belém. Online) - Universidade Federal Rural da Amazônia (UFRA)false
dc.title.none.fl_str_mv Least limiting water range (LLWR) of Oxisol under native cerrado and minimum soybean tillage
Intervalo hídrico ótimo de um Latossolo Vermelho distrófico sob cerrado nativo e cultivo mínimo com soja
title Least limiting water range (LLWR) of Oxisol under native cerrado and minimum soybean tillage
spellingShingle Least limiting water range (LLWR) of Oxisol under native cerrado and minimum soybean tillage
Ramos, Fabricio Tomaz
title_short Least limiting water range (LLWR) of Oxisol under native cerrado and minimum soybean tillage
title_full Least limiting water range (LLWR) of Oxisol under native cerrado and minimum soybean tillage
title_fullStr Least limiting water range (LLWR) of Oxisol under native cerrado and minimum soybean tillage
title_full_unstemmed Least limiting water range (LLWR) of Oxisol under native cerrado and minimum soybean tillage
title_sort Least limiting water range (LLWR) of Oxisol under native cerrado and minimum soybean tillage
author Ramos, Fabricio Tomaz
author_facet Ramos, Fabricio Tomaz
Maia, João Carlos de Souza
Roque, Marcio William
Serafim, Milson Evaldo
Azevedo, Emílio Carlos de
Ramos, Denis Tomás
author_role author
author2 Maia, João Carlos de Souza
Roque, Marcio William
Serafim, Milson Evaldo
Azevedo, Emílio Carlos de
Ramos, Denis Tomás
author2_role author
author
author
author
author
dc.contributor.author.fl_str_mv Ramos, Fabricio Tomaz
Maia, João Carlos de Souza
Roque, Marcio William
Serafim, Milson Evaldo
Azevedo, Emílio Carlos de
Ramos, Denis Tomás
description Understanding how production systems influence soil structure is important, because excessive compaction represents a major obstacle to water availability to plants. In this context, this study aimed to determine the impact of minimum tillage system in Oxisol under soybean, for eight years in succession, on the physical characteristics of the soil in 0-10, 10-20 and 20-30 cm layers and the correlation of these attributes with the least limiting water range (LLWR). An area of native cerrado was used as reference of soil physical quality.   It was possible to verify that the hypothesis that soil physical properties such as density (Ds) and soil organic matter, wet stable macroaggregates (4-2 mm), determined separately in an attempt to predict possible soil water restrictions for the development of plants imposed by structural degradation is valid, since they were correlated with the LLWR. Compared to native cerrado, soil structural degradation under minimum soybean tillage was more pronounced in the 0-10 cm layer due to higher Ds, lower stability of macroaggregates, organic matter and soil flocculation level, where more than 60% of Ds samples were above the Dscritical (LLWR = 0), resulting in a significantly lower LLWR. Regarding the parameters that define the LLWR, it was possible to observe that, under minimum tillage, there was greater proportion of samples, where θPA and θRP-limit (2.0 or 2.5 MPa) replaced θCC and θPMP, respectively. However, θRP-limit was the main factor for LLWR reduction.
publishDate 2012
dc.date.none.fl_str_mv 2012-07-27
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://ajaes.ufra.edu.br/index.php/ajaes/article/view/501
url https://ajaes.ufra.edu.br/index.php/ajaes/article/view/501
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv https://ajaes.ufra.edu.br/index.php/ajaes/article/view/501/235
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidade Federal Rural da Amazônia/UFRA
publisher.none.fl_str_mv Universidade Federal Rural da Amazônia/UFRA
dc.source.none.fl_str_mv Amazonian Journal of Agricultural Sciences Journal of Agricultural and Environmental Sciences; Vol 55 No 2 (2012): RCA; 124-133
Revista de Ciências Agrárias Amazonian Journal of Agricultural and Environmental Sciences; v. 55 n. 2 (2012): RCA; 124-133
2177-8760
1517-591X
reponame:Revista de Ciências Agrárias (Belém. Online)
instname:Universidade Federal Rural da Amazônia (UFRA)
instacron:UFRA
instname_str Universidade Federal Rural da Amazônia (UFRA)
instacron_str UFRA
institution UFRA
reponame_str Revista de Ciências Agrárias (Belém. Online)
collection Revista de Ciências Agrárias (Belém. Online)
repository.name.fl_str_mv Revista de Ciências Agrárias (Belém. Online) - Universidade Federal Rural da Amazônia (UFRA)
repository.mail.fl_str_mv allan.lobato@ufra.edu.br || ajaes.suporte@gmail.com
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