Least limiting water range (LLWR) of Oxisol under native cerrado and minimum soybean tillage
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Outros Autores: | , , , , |
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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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 |
_version_ |
1797231627053563904 |