Comparison of carbon and nitrogen determination methods for samples of a Paleudult subjected to no-till cropping systems
Main Author: | |
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Publication Date: | 2007 |
Other Authors: | , , , , |
Format: | Article |
Language: | eng |
Source: | Scientia Agrícola (Online) |
Download full: | https://www.revistas.usp.br/sa/article/view/22282 |
Summary: | Organic carbon (C) concentration evaluated by the Walkley-Black method, and total nitrogen(N)concentration determined by Kjeldahl method, were compared with corresponding results of C and N concentrations obtained through the dry combustion method (Elementar Vario EL analyzer), using samples of ten soil layers down to the depth of 107.5 cm of a kaolinitic Typic Paleudult (220-418 g clay kg-1 along the profile) subjected to no-till cropping systems [fallow bare soil, pigeon pea (Cajanus cajan L. Millsp.) plus maize, and lablab (Lablab purpureum L. Sweet) plus maize]. A close correlation (R² >; 0.96) was observed between the C results of the Walkley-Black and dry combustion methods, but a correction was suggested to be applied to C results of Walkley-Black (C = 1.05C W.Black + 0.47). A close correlation (R² >; 0.96) was also found between results of Kjeldahl-N and dry combustion-N, but no correction was necessary to be applied. The relationships between results of Walkley-Black and dry combustion and between results of Kjeldahl and dry combustion did not change among soil samples from different management systems, in disagreement to findings of a previous study where results of analytical C recovery were influenced by samples from different managements, supposedly because changes in lability or recalcitrance of organic matter might have affected the wet combustion reactions. A poor correlation (R² = 0.42) was found between the C:N ratios based on Walkley-Black and Kjeldahl analysis and the C:N ratios based on dry combustion analysis. The methods for C and N determination did not affect the interpretation of the effects of management systems on soil C and N stocks. |
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Scientia Agrícola (Online) |
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Comparison of carbon and nitrogen determination methods for samples of a Paleudult subjected to no-till cropping systems Comparação de métodos de determinação de carbono e nitrogênio em amostras de Argissolo sob plantio direto Walkley-BlackKjeldahlcombustão úmidacombustão secaWalkley-BlackKjeldahlwet combustiondry combustion Organic carbon (C) concentration evaluated by the Walkley-Black method, and total nitrogen(N)concentration determined by Kjeldahl method, were compared with corresponding results of C and N concentrations obtained through the dry combustion method (Elementar Vario EL analyzer), using samples of ten soil layers down to the depth of 107.5 cm of a kaolinitic Typic Paleudult (220-418 g clay kg-1 along the profile) subjected to no-till cropping systems [fallow bare soil, pigeon pea (Cajanus cajan L. Millsp.) plus maize, and lablab (Lablab purpureum L. Sweet) plus maize]. A close correlation (R² >; 0.96) was observed between the C results of the Walkley-Black and dry combustion methods, but a correction was suggested to be applied to C results of Walkley-Black (C = 1.05C W.Black + 0.47). A close correlation (R² >; 0.96) was also found between results of Kjeldahl-N and dry combustion-N, but no correction was necessary to be applied. The relationships between results of Walkley-Black and dry combustion and between results of Kjeldahl and dry combustion did not change among soil samples from different management systems, in disagreement to findings of a previous study where results of analytical C recovery were influenced by samples from different managements, supposedly because changes in lability or recalcitrance of organic matter might have affected the wet combustion reactions. A poor correlation (R² = 0.42) was found between the C:N ratios based on Walkley-Black and Kjeldahl analysis and the C:N ratios based on dry combustion analysis. The methods for C and N determination did not affect the interpretation of the effects of management systems on soil C and N stocks. Resultados de concentração de carbono (C), obtidos pelo método Walkley-Black, e resultados de concentração de nitrogênio (N) total, determinados pelo método Kjeldahl, foram comparados com os correspondentes resultados de C e N obtidos pelo método de combustão seca (analisador Elementar Vario EL), utilizando-se amostras de dez camadas de um Argissolo Vermelho até a profundidade de 107.5 cm (220-418 g argila kg-1 ao longo do perifl), manejado em sistemas de culturas de plantio direto [solo descoberto, guandu (Cajanus cajan L. Millsp.) mais milho, e lab lab (Lablab purpureum L. Sweet) mais milho]. Alta correlação (R² >; 0.96) foi observada entre os resultados de C-Walkley-Black e C-combustão seca. Uma correção foi sugerida para os resultados de C-Walkley-Black (C = 1.05C W.Black + 0.47). Elevada correlação (R² >; 0.96) também foi observada entre os resultados de N-Kjeldahl e N-combustão seca, não sendo necessária a aplicação de uma correção aos resultados de N-Kjeldahl. A relação entre os resultados de Walkley-Black e combustão seca e entre os resultados de Kjeldahl e combustão seca não mudaram entre amostras de solo de diferentes sistemas de manejo, diferindo dos resultados de um trabalho anterior onde a recuperação analítica de C foi influenciada por amostras oriundas de diferentes manejos, supostamente por alterações na labilidade ou recalcitrância da matéria orgânica terem afetado as reações de combustão úmida. Uma baixa correlação (R² = 0.42) foi observada entre a relação C:N baseada nas análises Walkley-Black e Kjeldahl e a relação C:N baseada na combustão seca. Os métodos de determinação de C e N não afetaram as interpretações do efeito de sistemas de manejo sobre os estoques de C e N no solo. Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz2007-10-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://www.revistas.usp.br/sa/article/view/2228210.1590/S0103-90162007000500011Scientia Agricola; v. 64 n. 5 (2007); 532-540Scientia Agricola; Vol. 64 No. 5 (2007); 532-540Scientia Agricola; Vol. 64 Núm. 5 (2007); 532-5401678-992X0103-9016reponame:Scientia Agrícola (Online)instname:Universidade de São Paulo (USP)instacron:USPenghttps://www.revistas.usp.br/sa/article/view/22282/24306Copyright (c) 2015 Scientia Agricolainfo:eu-repo/semantics/openAccessDieckow, JefersonMielniczuk, JoãoKnicker, HeikeBayer, CimélioDick, Deborah PinheiroKögel-Knabner, Ingrid2015-07-07T17:32:22Zoai:revistas.usp.br:article/22282Revistahttp://revistas.usp.br/sa/indexPUBhttps://old.scielo.br/oai/scielo-oai.phpscientia@usp.br||alleoni@usp.br1678-992X0103-9016opendoar:2015-07-07T17:32:22Scientia Agrícola (Online) - Universidade de São Paulo (USP)false |
dc.title.none.fl_str_mv |
Comparison of carbon and nitrogen determination methods for samples of a Paleudult subjected to no-till cropping systems Comparação de métodos de determinação de carbono e nitrogênio em amostras de Argissolo sob plantio direto |
title |
Comparison of carbon and nitrogen determination methods for samples of a Paleudult subjected to no-till cropping systems |
spellingShingle |
Comparison of carbon and nitrogen determination methods for samples of a Paleudult subjected to no-till cropping systems Dieckow, Jeferson Walkley-Black Kjeldahl combustão úmida combustão seca Walkley-Black Kjeldahl wet combustion dry combustion |
title_short |
Comparison of carbon and nitrogen determination methods for samples of a Paleudult subjected to no-till cropping systems |
title_full |
Comparison of carbon and nitrogen determination methods for samples of a Paleudult subjected to no-till cropping systems |
title_fullStr |
Comparison of carbon and nitrogen determination methods for samples of a Paleudult subjected to no-till cropping systems |
title_full_unstemmed |
Comparison of carbon and nitrogen determination methods for samples of a Paleudult subjected to no-till cropping systems |
title_sort |
Comparison of carbon and nitrogen determination methods for samples of a Paleudult subjected to no-till cropping systems |
author |
Dieckow, Jeferson |
author_facet |
Dieckow, Jeferson Mielniczuk, João Knicker, Heike Bayer, Cimélio Dick, Deborah Pinheiro Kögel-Knabner, Ingrid |
author_role |
author |
author2 |
Mielniczuk, João Knicker, Heike Bayer, Cimélio Dick, Deborah Pinheiro Kögel-Knabner, Ingrid |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Dieckow, Jeferson Mielniczuk, João Knicker, Heike Bayer, Cimélio Dick, Deborah Pinheiro Kögel-Knabner, Ingrid |
dc.subject.por.fl_str_mv |
Walkley-Black Kjeldahl combustão úmida combustão seca Walkley-Black Kjeldahl wet combustion dry combustion |
topic |
Walkley-Black Kjeldahl combustão úmida combustão seca Walkley-Black Kjeldahl wet combustion dry combustion |
description |
Organic carbon (C) concentration evaluated by the Walkley-Black method, and total nitrogen(N)concentration determined by Kjeldahl method, were compared with corresponding results of C and N concentrations obtained through the dry combustion method (Elementar Vario EL analyzer), using samples of ten soil layers down to the depth of 107.5 cm of a kaolinitic Typic Paleudult (220-418 g clay kg-1 along the profile) subjected to no-till cropping systems [fallow bare soil, pigeon pea (Cajanus cajan L. Millsp.) plus maize, and lablab (Lablab purpureum L. Sweet) plus maize]. A close correlation (R² >; 0.96) was observed between the C results of the Walkley-Black and dry combustion methods, but a correction was suggested to be applied to C results of Walkley-Black (C = 1.05C W.Black + 0.47). A close correlation (R² >; 0.96) was also found between results of Kjeldahl-N and dry combustion-N, but no correction was necessary to be applied. The relationships between results of Walkley-Black and dry combustion and between results of Kjeldahl and dry combustion did not change among soil samples from different management systems, in disagreement to findings of a previous study where results of analytical C recovery were influenced by samples from different managements, supposedly because changes in lability or recalcitrance of organic matter might have affected the wet combustion reactions. A poor correlation (R² = 0.42) was found between the C:N ratios based on Walkley-Black and Kjeldahl analysis and the C:N ratios based on dry combustion analysis. The methods for C and N determination did not affect the interpretation of the effects of management systems on soil C and N stocks. |
publishDate |
2007 |
dc.date.none.fl_str_mv |
2007-10-01 |
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://www.revistas.usp.br/sa/article/view/22282 10.1590/S0103-90162007000500011 |
url |
https://www.revistas.usp.br/sa/article/view/22282 |
identifier_str_mv |
10.1590/S0103-90162007000500011 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
https://www.revistas.usp.br/sa/article/view/22282/24306 |
dc.rights.driver.fl_str_mv |
Copyright (c) 2015 Scientia Agricola info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Copyright (c) 2015 Scientia Agricola |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz |
publisher.none.fl_str_mv |
Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz |
dc.source.none.fl_str_mv |
Scientia Agricola; v. 64 n. 5 (2007); 532-540 Scientia Agricola; Vol. 64 No. 5 (2007); 532-540 Scientia Agricola; Vol. 64 Núm. 5 (2007); 532-540 1678-992X 0103-9016 reponame:Scientia Agrícola (Online) instname:Universidade de São Paulo (USP) instacron:USP |
instname_str |
Universidade de São Paulo (USP) |
instacron_str |
USP |
institution |
USP |
reponame_str |
Scientia Agrícola (Online) |
collection |
Scientia Agrícola (Online) |
repository.name.fl_str_mv |
Scientia Agrícola (Online) - Universidade de São Paulo (USP) |
repository.mail.fl_str_mv |
scientia@usp.br||alleoni@usp.br |
_version_ |
1787713256693956608 |