An algebraic pedotransfer function to calculate standardized in situ determined field capacity.
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) |
Texto Completo: | http://www.alice.cnptia.embrapa.br/alice/handle/doc/1051668 |
Resumo: | Despite the large applicability of the field capacity (FC) concept in hydrology and engineering, it presents various ambiguities and inconsistencies due to a lack of methodological procedure standardization. Experimental field and laboratory protocols taken from the literature were used in this study to determine the value of FC for different depths in 29 soil profiles, totaling 209 soil samples. The volumetric water content (θ) values were also determined at three suction values (6 kPa, 10 kPa, 33 kPa), along with bulk density (BD), texture (T) and organic matter content (OM). The protocols were devised based on the water processes involved in the FC concept aiming at minimizing hydraulic inconsistencies and procedural difficulty while maintaining the practical meaning of the concept. A high correlation between FC and θ(6 kPa) allowed the development of a pedotransfer function (Equation 3) quadratic for θ(6 kPa), resulting in an accurate and nearly bias-free calculation of FC for the four database geographic areas, with a global root mean squared residue (RMSR) of 0.026 m3·m-3. At the individual soil profile scale, the maximum RMSR was only 0.040 m3·m-3. The BD, T and OM data were generally of a low predicting quality regarding FC when not accompanied by the moisture variables. As all the FC values were obtained by the same experimental protocol and as the predicting quality of Equation 3 was clearly better than that of the classical method, which considers FC equal to θ(6), θ(10) or θ(33), we recommend using Equation 3 rather than the classical method, as well as the protocol presented here, to determine in-situ FC. |
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An algebraic pedotransfer function to calculate standardized in situ determined field capacity.Capacidade de campoDrenagem internaFunções de pedotransferênciaDespite the large applicability of the field capacity (FC) concept in hydrology and engineering, it presents various ambiguities and inconsistencies due to a lack of methodological procedure standardization. Experimental field and laboratory protocols taken from the literature were used in this study to determine the value of FC for different depths in 29 soil profiles, totaling 209 soil samples. The volumetric water content (θ) values were also determined at three suction values (6 kPa, 10 kPa, 33 kPa), along with bulk density (BD), texture (T) and organic matter content (OM). The protocols were devised based on the water processes involved in the FC concept aiming at minimizing hydraulic inconsistencies and procedural difficulty while maintaining the practical meaning of the concept. A high correlation between FC and θ(6 kPa) allowed the development of a pedotransfer function (Equation 3) quadratic for θ(6 kPa), resulting in an accurate and nearly bias-free calculation of FC for the four database geographic areas, with a global root mean squared residue (RMSR) of 0.026 m3·m-3. At the individual soil profile scale, the maximum RMSR was only 0.040 m3·m-3. The BD, T and OM data were generally of a low predicting quality regarding FC when not accompanied by the moisture variables. As all the FC values were obtained by the same experimental protocol and as the predicting quality of Equation 3 was clearly better than that of the classical method, which considers FC equal to θ(6), θ(10) or θ(33), we recommend using Equation 3 rather than the classical method, as well as the protocol presented here, to determine in-situ FC.THEOPHILO B. OTTONI FILHO, UFRJ; ISAIAS F. LEAL, UFRJ; JOSE RONALDO DE MACEDO, CNPS; BRUNO C. B. REIS, UFRJ.OTTONI FILHO, T. B.LEAL, I. F.MACEDO, J. R. deREIS, B. C. B.2016-08-25T11:11:11Z2016-08-25T11:11:11Z2016-08-2520162016-08-25T11:11:11Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleJournal of Agricultural Science, v. 8, n. 8, p. 158-170, 2016.http://www.alice.cnptia.embrapa.br/alice/handle/doc/105166810.5539/jas.v8n8p158enginfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPA2017-08-16T02:53:01Zoai:www.alice.cnptia.embrapa.br:doc/1051668Repositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestopendoar:21542017-08-16T02:53:01falseRepositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestcg-riaa@embrapa.bropendoar:21542017-08-16T02:53:01Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false |
dc.title.none.fl_str_mv |
An algebraic pedotransfer function to calculate standardized in situ determined field capacity. |
title |
An algebraic pedotransfer function to calculate standardized in situ determined field capacity. |
spellingShingle |
An algebraic pedotransfer function to calculate standardized in situ determined field capacity. OTTONI FILHO, T. B. Capacidade de campo Drenagem interna Funções de pedotransferência |
title_short |
An algebraic pedotransfer function to calculate standardized in situ determined field capacity. |
title_full |
An algebraic pedotransfer function to calculate standardized in situ determined field capacity. |
title_fullStr |
An algebraic pedotransfer function to calculate standardized in situ determined field capacity. |
title_full_unstemmed |
An algebraic pedotransfer function to calculate standardized in situ determined field capacity. |
title_sort |
An algebraic pedotransfer function to calculate standardized in situ determined field capacity. |
author |
OTTONI FILHO, T. B. |
author_facet |
OTTONI FILHO, T. B. LEAL, I. F. MACEDO, J. R. de REIS, B. C. B. |
author_role |
author |
author2 |
LEAL, I. F. MACEDO, J. R. de REIS, B. C. B. |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
THEOPHILO B. OTTONI FILHO, UFRJ; ISAIAS F. LEAL, UFRJ; JOSE RONALDO DE MACEDO, CNPS; BRUNO C. B. REIS, UFRJ. |
dc.contributor.author.fl_str_mv |
OTTONI FILHO, T. B. LEAL, I. F. MACEDO, J. R. de REIS, B. C. B. |
dc.subject.por.fl_str_mv |
Capacidade de campo Drenagem interna Funções de pedotransferência |
topic |
Capacidade de campo Drenagem interna Funções de pedotransferência |
description |
Despite the large applicability of the field capacity (FC) concept in hydrology and engineering, it presents various ambiguities and inconsistencies due to a lack of methodological procedure standardization. Experimental field and laboratory protocols taken from the literature were used in this study to determine the value of FC for different depths in 29 soil profiles, totaling 209 soil samples. The volumetric water content (θ) values were also determined at three suction values (6 kPa, 10 kPa, 33 kPa), along with bulk density (BD), texture (T) and organic matter content (OM). The protocols were devised based on the water processes involved in the FC concept aiming at minimizing hydraulic inconsistencies and procedural difficulty while maintaining the practical meaning of the concept. A high correlation between FC and θ(6 kPa) allowed the development of a pedotransfer function (Equation 3) quadratic for θ(6 kPa), resulting in an accurate and nearly bias-free calculation of FC for the four database geographic areas, with a global root mean squared residue (RMSR) of 0.026 m3·m-3. At the individual soil profile scale, the maximum RMSR was only 0.040 m3·m-3. The BD, T and OM data were generally of a low predicting quality regarding FC when not accompanied by the moisture variables. As all the FC values were obtained by the same experimental protocol and as the predicting quality of Equation 3 was clearly better than that of the classical method, which considers FC equal to θ(6), θ(10) or θ(33), we recommend using Equation 3 rather than the classical method, as well as the protocol presented here, to determine in-situ FC. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-08-25T11:11:11Z 2016-08-25T11:11:11Z 2016-08-25 2016 2016-08-25T11:11:11Z |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/publishedVersion info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
Journal of Agricultural Science, v. 8, n. 8, p. 158-170, 2016. http://www.alice.cnptia.embrapa.br/alice/handle/doc/1051668 10.5539/jas.v8n8p158 |
identifier_str_mv |
Journal of Agricultural Science, v. 8, n. 8, p. 158-170, 2016. 10.5539/jas.v8n8p158 |
url |
http://www.alice.cnptia.embrapa.br/alice/handle/doc/1051668 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa) instacron:EMBRAPA |
instname_str |
Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
instacron_str |
EMBRAPA |
institution |
EMBRAPA |
reponame_str |
Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) |
collection |
Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) |
repository.name.fl_str_mv |
Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
repository.mail.fl_str_mv |
cg-riaa@embrapa.br |
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1794503424794951680 |