Effect of soil mineralogy on potassium fixation in soils developed on different parent material
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10348/9156 |
Resumo: | Potassium release from weathering of soil minerals may support the K nutrition of crops for many years. However, when soils become exhausted, the response to K fertilisation may be limited due to its fixation in nonexchangeable forms, reducing the efficacy of K fertilisation. The present study examines the role of soil mineralogical composition on the K fixation characteristics of soils developed under a Mediterranean type of climate. Nine soils derived from different parent materials were collected in several regions of Portugal. Soil properties were determined, and clay, silt and fine-sand fractions were studied by X-ray diffraction. Potassium fixation was determined after the soil samples had been treated with increasing rates of K application. The amount of K fixed was obtained by difference, measuring the amount of K remaining extractable by ammonium acetate. The soils under study showed a relatively high K fixation capacity, varying between 30 and 80% for an application rate equivalent to 800kgKha−1. Soils with high K fixation capacity were derived from gabbros, gabbrodiorites and quarzdiorites, and had relevant amounts of vermiculites and/or interstratified mica-vermiculite minerals, either in the clay or in the silt and fine sand fractions. Soils rich in calcium carbonates also fix high amounts of K. These soils contain mica-illite minerals and are rich in some of the above-mentioned minerals in the clay and silt fractions. While K fixation capacity is normally assumed to derive from minerals in the clay fraction, the results of this study show that vermiculites and/or interstratified mica-vermiculites presentin the silt and finesand fractions can contribute asignificant proportion of the total K fixation capacity and, thus, these size fractions should also be included in any assessment of K fixation capacity. |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Effect of soil mineralogy on potassium fixation in soils developed on different parent materialPotassium fixationSoil mineralogyX-ray diffractionSoil-size fractionsVermiculitesPotassium release from weathering of soil minerals may support the K nutrition of crops for many years. However, when soils become exhausted, the response to K fertilisation may be limited due to its fixation in nonexchangeable forms, reducing the efficacy of K fertilisation. The present study examines the role of soil mineralogical composition on the K fixation characteristics of soils developed under a Mediterranean type of climate. Nine soils derived from different parent materials were collected in several regions of Portugal. Soil properties were determined, and clay, silt and fine-sand fractions were studied by X-ray diffraction. Potassium fixation was determined after the soil samples had been treated with increasing rates of K application. The amount of K fixed was obtained by difference, measuring the amount of K remaining extractable by ammonium acetate. The soils under study showed a relatively high K fixation capacity, varying between 30 and 80% for an application rate equivalent to 800kgKha−1. Soils with high K fixation capacity were derived from gabbros, gabbrodiorites and quarzdiorites, and had relevant amounts of vermiculites and/or interstratified mica-vermiculite minerals, either in the clay or in the silt and fine sand fractions. Soils rich in calcium carbonates also fix high amounts of K. These soils contain mica-illite minerals and are rich in some of the above-mentioned minerals in the clay and silt fractions. While K fixation capacity is normally assumed to derive from minerals in the clay fraction, the results of this study show that vermiculites and/or interstratified mica-vermiculites presentin the silt and finesand fractions can contribute asignificant proportion of the total K fixation capacity and, thus, these size fractions should also be included in any assessment of K fixation capacity.Edward A. Nater2019-03-27T09:54:00Z2019-01-01T00:00:00Z2019info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10348/9156enghttps://doi.org/10.1016/j.geoderma.2019.02.040Portela, EsterMonteiro, FernandoFonseca, MadalenaAbreu, Maria Manuelainfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-02-02T12:57:13Zoai:repositorio.utad.pt:10348/9156Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T02:06:36.135987Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Effect of soil mineralogy on potassium fixation in soils developed on different parent material |
title |
Effect of soil mineralogy on potassium fixation in soils developed on different parent material |
spellingShingle |
Effect of soil mineralogy on potassium fixation in soils developed on different parent material Portela, Ester Potassium fixation Soil mineralogy X-ray diffraction Soil-size fractions Vermiculites |
title_short |
Effect of soil mineralogy on potassium fixation in soils developed on different parent material |
title_full |
Effect of soil mineralogy on potassium fixation in soils developed on different parent material |
title_fullStr |
Effect of soil mineralogy on potassium fixation in soils developed on different parent material |
title_full_unstemmed |
Effect of soil mineralogy on potassium fixation in soils developed on different parent material |
title_sort |
Effect of soil mineralogy on potassium fixation in soils developed on different parent material |
author |
Portela, Ester |
author_facet |
Portela, Ester Monteiro, Fernando Fonseca, Madalena Abreu, Maria Manuela |
author_role |
author |
author2 |
Monteiro, Fernando Fonseca, Madalena Abreu, Maria Manuela |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Portela, Ester Monteiro, Fernando Fonseca, Madalena Abreu, Maria Manuela |
dc.subject.por.fl_str_mv |
Potassium fixation Soil mineralogy X-ray diffraction Soil-size fractions Vermiculites |
topic |
Potassium fixation Soil mineralogy X-ray diffraction Soil-size fractions Vermiculites |
description |
Potassium release from weathering of soil minerals may support the K nutrition of crops for many years. However, when soils become exhausted, the response to K fertilisation may be limited due to its fixation in nonexchangeable forms, reducing the efficacy of K fertilisation. The present study examines the role of soil mineralogical composition on the K fixation characteristics of soils developed under a Mediterranean type of climate. Nine soils derived from different parent materials were collected in several regions of Portugal. Soil properties were determined, and clay, silt and fine-sand fractions were studied by X-ray diffraction. Potassium fixation was determined after the soil samples had been treated with increasing rates of K application. The amount of K fixed was obtained by difference, measuring the amount of K remaining extractable by ammonium acetate. The soils under study showed a relatively high K fixation capacity, varying between 30 and 80% for an application rate equivalent to 800kgKha−1. Soils with high K fixation capacity were derived from gabbros, gabbrodiorites and quarzdiorites, and had relevant amounts of vermiculites and/or interstratified mica-vermiculite minerals, either in the clay or in the silt and fine sand fractions. Soils rich in calcium carbonates also fix high amounts of K. These soils contain mica-illite minerals and are rich in some of the above-mentioned minerals in the clay and silt fractions. While K fixation capacity is normally assumed to derive from minerals in the clay fraction, the results of this study show that vermiculites and/or interstratified mica-vermiculites presentin the silt and finesand fractions can contribute asignificant proportion of the total K fixation capacity and, thus, these size fractions should also be included in any assessment of K fixation capacity. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-03-27T09:54:00Z 2019-01-01T00:00:00Z 2019 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10348/9156 |
url |
http://hdl.handle.net/10348/9156 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
https://doi.org/10.1016/j.geoderma.2019.02.040 |
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 |
Edward A. Nater |
publisher.none.fl_str_mv |
Edward A. Nater |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
|
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1799137154110062592 |