Desenvolvimento de sistema polimérico a base de turfas e substâncias húmicas para liberação lenta de nutrientes para plantas

Detalhes bibliográficos
Autor(a) principal: Melo, Camila de Almeida [UNESP]
Data de Publicação: 2014
Tipo de documento: Tese
Idioma: por
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://hdl.handle.net/11449/110716
Resumo: One of the main current challenges of the fertilizer industry is to try to combine, in a single product, two ingredients so necessary for good plant growth: organic matter and nutrients, in order that nutrients are available depending on the need of the plants avoiding environmental problems caused by excess thereof. Thinking about this, the aim of this study was to develop and evaluate the use of peat and peat humic substances enriched with the micronutrients Cu, Co, Fe, Mn, Ni and Zn in the slow release of these nutrients in a aqueos and soil/plant system. Two peat samples from region of Sergipe (TSA and TSI) were used as well as the humic substances from both samples (TSA-SH and TSI-SH). The samples were characterized by several techniques including CHN, FTIR, NMR, TG and MEV. The best conditions for adsorption of micronutrients on peat samples were evaluated by checking that the maximum adsorption occurred at pH 6.0, and the adsorption process follows a pseudo-second order kinetics and the Langmuir model was best fitted to the data obtained. The order of adsorption affinity in general was: Cu>Fe>Ni=Zn=Co>Mn. The release experiments of peat enriched in the aqueous and in the soil/plant system showed that the release of micronutrients follows, in general, the following order: Zn≥Fe>Mn>Co>Ni>Cu and in the pH 6.0 and for sample TSI the release were greater. The best complexing capacity was obtained at pH 4.5, whereas for the sample TSASH the quantities of micronutrients complexed were higher than for the sample TSISH. These differences are explained by the differences observed in the chemical molecular structure observed in the characterizations. The most stable complexes are formed with iron and the less stable with zinc, favoring the release of the latter. The polymer beads developed with peat and peat humic substances enriched with micronutrients showed satisfactory results and can be classified as slow-release fertilizers.
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spelling Desenvolvimento de sistema polimérico a base de turfas e substâncias húmicas para liberação lenta de nutrientes para plantasQuimica analiticaTurfaSubstâncias húmicasElementos traços na nutriçãoPeatOne of the main current challenges of the fertilizer industry is to try to combine, in a single product, two ingredients so necessary for good plant growth: organic matter and nutrients, in order that nutrients are available depending on the need of the plants avoiding environmental problems caused by excess thereof. Thinking about this, the aim of this study was to develop and evaluate the use of peat and peat humic substances enriched with the micronutrients Cu, Co, Fe, Mn, Ni and Zn in the slow release of these nutrients in a aqueos and soil/plant system. Two peat samples from region of Sergipe (TSA and TSI) were used as well as the humic substances from both samples (TSA-SH and TSI-SH). The samples were characterized by several techniques including CHN, FTIR, NMR, TG and MEV. The best conditions for adsorption of micronutrients on peat samples were evaluated by checking that the maximum adsorption occurred at pH 6.0, and the adsorption process follows a pseudo-second order kinetics and the Langmuir model was best fitted to the data obtained. The order of adsorption affinity in general was: Cu>Fe>Ni=Zn=Co>Mn. The release experiments of peat enriched in the aqueous and in the soil/plant system showed that the release of micronutrients follows, in general, the following order: Zn≥Fe>Mn>Co>Ni>Cu and in the pH 6.0 and for sample TSI the release were greater. The best complexing capacity was obtained at pH 4.5, whereas for the sample TSASH the quantities of micronutrients complexed were higher than for the sample TSISH. These differences are explained by the differences observed in the chemical molecular structure observed in the characterizations. The most stable complexes are formed with iron and the less stable with zinc, favoring the release of the latter. The polymer beads developed with peat and peat humic substances enriched with micronutrients showed satisfactory results and can be classified as slow-release fertilizers.Um dos principais desafios atuais da indústria de fertilizantes é tentar combinar, em um único produto, dois ingredientes tão necessários para o bom desenvolvimento das plantas: matéria orgânica e nutrientes; de forma que os nutrientes sejam disponibilizados em função da necessidade das plantas evitando problemas ambientais causados pelo excesso dos mesmos. Pensando nisso, o objetivo deste trabalho foi desenvolver e avaliar a utilização de turfas e de substâncias húmicas de turfas enriquecidas com os micronutrientes Cu, Co, Fe, Mn, Ni e Zn na liberação lenta destes nutrientes em sistema aquoso e solo/planta. Duas amostras de turfas da região de Sergipe (TSA e TSI) foram utilizadas, bem como as substâncias húmicas de ambas amostras (TSA-SH e TSI-SH). As amostras foram caracterizadas por diferentes técnicas incluindo CHN, FTIR, RMN, TG e MEV. Foram avaliadas as melhores condições de adsorção dos micronutrientes nas amostras de turfas, verificando que as adsorções máximas ocorrem em pH 6,0, assim como o processo de adsorção segue uma cinética de pseudo segunda ordem e o modelo de Langmuir foi melhor ajustado aos dados obtidos. A ordem de afinidade das adsorções em geral foi: Cu>Fe>Ni=Zn=Co>Mn. Os experimentos de liberação das turfas enriquecidas em sistema aquoso e em sistema solo/planta mostraram que a liberação dos micronutrientes segue, em geral, a seguinte ordem: Zn≥Fe>Mn>Co>Ni>Cu e que em pH 6,0 e para a amostra TSI as liberações são maiores. As melhores capacidades de complexação foram obtidas em pH 4,5, sendo que para a amostra TSA-SH as quantidades de micronutrientes complexados foram maiores do que a amostra TSI-SH. Estas diferenças são justificadas pelas diferenças obtidas na estrutura molecular química observadas nas caracterizações. Os complexos mais estáveis são formados com o ferro e os menos estáveis com o zinco, favorecendo a liberação do último. As esferas poliméricas...Universidade Estadual Paulista (Unesp)Rosa, André Henrique [UNESP]Fraceto, Leonardo Fernandes [UNESP]Universidade Estadual Paulista (Unesp)Melo, Camila de Almeida [UNESP]2014-11-10T11:09:59Z2014-11-10T11:09:59Z2014-02-07info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesis114 f. : il.application/pdfMELO, Camila de Almeida. Desenvolvimento de sistema polimérico a base de turfas e substâncias húmicas para liberação lenta de nutrientes para plantas. 2014. 114 f. Tese (doutorado) - Universidade Estadual Paulista Júlio de Mesquita Filho, Instituto de Química de Araraquara, 2014.http://hdl.handle.net/11449/110716000774465000774465.pdf33004030072P8Alephreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPporinfo:eu-repo/semantics/openAccess2023-12-24T06:13:04Zoai:repositorio.unesp.br:11449/110716Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T21:07:48.714383Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Desenvolvimento de sistema polimérico a base de turfas e substâncias húmicas para liberação lenta de nutrientes para plantas
title Desenvolvimento de sistema polimérico a base de turfas e substâncias húmicas para liberação lenta de nutrientes para plantas
spellingShingle Desenvolvimento de sistema polimérico a base de turfas e substâncias húmicas para liberação lenta de nutrientes para plantas
Melo, Camila de Almeida [UNESP]
Quimica analitica
Turfa
Substâncias húmicas
Elementos traços na nutrição
Peat
title_short Desenvolvimento de sistema polimérico a base de turfas e substâncias húmicas para liberação lenta de nutrientes para plantas
title_full Desenvolvimento de sistema polimérico a base de turfas e substâncias húmicas para liberação lenta de nutrientes para plantas
title_fullStr Desenvolvimento de sistema polimérico a base de turfas e substâncias húmicas para liberação lenta de nutrientes para plantas
title_full_unstemmed Desenvolvimento de sistema polimérico a base de turfas e substâncias húmicas para liberação lenta de nutrientes para plantas
title_sort Desenvolvimento de sistema polimérico a base de turfas e substâncias húmicas para liberação lenta de nutrientes para plantas
author Melo, Camila de Almeida [UNESP]
author_facet Melo, Camila de Almeida [UNESP]
author_role author
dc.contributor.none.fl_str_mv Rosa, André Henrique [UNESP]
Fraceto, Leonardo Fernandes [UNESP]
Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Melo, Camila de Almeida [UNESP]
dc.subject.por.fl_str_mv Quimica analitica
Turfa
Substâncias húmicas
Elementos traços na nutrição
Peat
topic Quimica analitica
Turfa
Substâncias húmicas
Elementos traços na nutrição
Peat
description One of the main current challenges of the fertilizer industry is to try to combine, in a single product, two ingredients so necessary for good plant growth: organic matter and nutrients, in order that nutrients are available depending on the need of the plants avoiding environmental problems caused by excess thereof. Thinking about this, the aim of this study was to develop and evaluate the use of peat and peat humic substances enriched with the micronutrients Cu, Co, Fe, Mn, Ni and Zn in the slow release of these nutrients in a aqueos and soil/plant system. Two peat samples from region of Sergipe (TSA and TSI) were used as well as the humic substances from both samples (TSA-SH and TSI-SH). The samples were characterized by several techniques including CHN, FTIR, NMR, TG and MEV. The best conditions for adsorption of micronutrients on peat samples were evaluated by checking that the maximum adsorption occurred at pH 6.0, and the adsorption process follows a pseudo-second order kinetics and the Langmuir model was best fitted to the data obtained. The order of adsorption affinity in general was: Cu>Fe>Ni=Zn=Co>Mn. The release experiments of peat enriched in the aqueous and in the soil/plant system showed that the release of micronutrients follows, in general, the following order: Zn≥Fe>Mn>Co>Ni>Cu and in the pH 6.0 and for sample TSI the release were greater. The best complexing capacity was obtained at pH 4.5, whereas for the sample TSASH the quantities of micronutrients complexed were higher than for the sample TSISH. These differences are explained by the differences observed in the chemical molecular structure observed in the characterizations. The most stable complexes are formed with iron and the less stable with zinc, favoring the release of the latter. The polymer beads developed with peat and peat humic substances enriched with micronutrients showed satisfactory results and can be classified as slow-release fertilizers.
publishDate 2014
dc.date.none.fl_str_mv 2014-11-10T11:09:59Z
2014-11-10T11:09:59Z
2014-02-07
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/doctoralThesis
format doctoralThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv MELO, Camila de Almeida. Desenvolvimento de sistema polimérico a base de turfas e substâncias húmicas para liberação lenta de nutrientes para plantas. 2014. 114 f. Tese (doutorado) - Universidade Estadual Paulista Júlio de Mesquita Filho, Instituto de Química de Araraquara, 2014.
http://hdl.handle.net/11449/110716
000774465
000774465.pdf
33004030072P8
identifier_str_mv MELO, Camila de Almeida. Desenvolvimento de sistema polimérico a base de turfas e substâncias húmicas para liberação lenta de nutrientes para plantas. 2014. 114 f. Tese (doutorado) - Universidade Estadual Paulista Júlio de Mesquita Filho, Instituto de Química de Araraquara, 2014.
000774465
000774465.pdf
33004030072P8
url http://hdl.handle.net/11449/110716
dc.language.iso.fl_str_mv por
language por
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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dc.format.none.fl_str_mv 114 f. : il.
application/pdf
dc.publisher.none.fl_str_mv Universidade Estadual Paulista (Unesp)
publisher.none.fl_str_mv Universidade Estadual Paulista (Unesp)
dc.source.none.fl_str_mv Aleph
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
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reponame_str Repositório Institucional da UNESP
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repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
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