Chemical characteristics of an Oxisol after urea and potassium chloride fertilization in a protected environment
Autor(a) principal: | |
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Data de Publicação: | 2001 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Scientia Agrícola (Online) |
Texto Completo: | https://www.revistas.usp.br/sa/article/view/21645 |
Resumo: | The production of healthy, high quality vegetables and the development of technologies for continuous supply to the market are important factors determining the adaption of protected cultivation systems by an increasing number of growers. Due to the little knowledge on soil management practices under these conditions, high fertilizer rates are normally applied, causing salinity problems and nutricional unbalances. The objective of this paper was to evaluate the effects of urea and potassium chloride applications on the chemical characteristics of an Eutrorthox, mainly on its acidity and potassium saturation. The N was applied in rates of 13.3 and 39.9g m-2 and the K in rates 5.5 and 16.6 g m-2, in a fatorial (2X2+1) design, including a control. Pepper plants (Capsicum annuum, Mayata cultivar) were grown under protected condition, during 34 weeks. After seedling rooting, the nutrients were applied at the rate of one sixth of the total at ten day intervals, up to 60 days. It was observed that urea did not acidify the soil probabily due to its high buffering capacity. The nitric and ammoniacal forms of N were directly effeted by the N rates applied in relation to the soil. In the treatment with N, the roots showed better development compared to the control. However, the highest K rate, applied as KCl, decreased root growth, probably due to the high soil K concentration and possible salinity effects, resulting in more than 5.0 mmol c dm-3 of K and more than 5.3% of K saturation in the exchange complex. |
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Chemical characteristics of an Oxisol after urea and potassium chloride fertilization in a protected environment Características químicas de um latossolo adubado com uréia e cloreto de potássio em ambiente protegido Capsicum annuumadubação nitrogenadaadubação potássicasaturação de potássioCapsicum annuumnitrogenpotassiumpotassium saturation The production of healthy, high quality vegetables and the development of technologies for continuous supply to the market are important factors determining the adaption of protected cultivation systems by an increasing number of growers. Due to the little knowledge on soil management practices under these conditions, high fertilizer rates are normally applied, causing salinity problems and nutricional unbalances. The objective of this paper was to evaluate the effects of urea and potassium chloride applications on the chemical characteristics of an Eutrorthox, mainly on its acidity and potassium saturation. The N was applied in rates of 13.3 and 39.9g m-2 and the K in rates 5.5 and 16.6 g m-2, in a fatorial (2X2+1) design, including a control. Pepper plants (Capsicum annuum, Mayata cultivar) were grown under protected condition, during 34 weeks. After seedling rooting, the nutrients were applied at the rate of one sixth of the total at ten day intervals, up to 60 days. It was observed that urea did not acidify the soil probabily due to its high buffering capacity. The nitric and ammoniacal forms of N were directly effeted by the N rates applied in relation to the soil. In the treatment with N, the roots showed better development compared to the control. However, the highest K rate, applied as KCl, decreased root growth, probably due to the high soil K concentration and possible salinity effects, resulting in more than 5.0 mmol c dm-3 of K and more than 5.3% of K saturation in the exchange complex. A produção de vegetais mais sadios e de boa qualidade e o fornecimento contínuo no mercado são fatores que têm determinado a adoção do sistema de cultivo protegido por um número maior de produtores. Porém, devido ao pouco conhecimento sobre o manejo do solo nessas condições, tem-se aplicado altas doses de fertilizantes, ocasionando problemas de salinidade e desequilíbrio nutricional. O objetivo desse trabalho foi avaliar os efeitos da aplicação da uréia e do cloreto de potássio nas características químicas de um LATOSSOLO VERMELHO Destrófico, principalmente nos índices de acidez e saturação em potássio. O N e o K foram aplicados em cobertura, nas doses equivalentes de 13,3 e 39,9 g m-2 de N e 5,5 e 16,6 g m-2 de K, em esquema fatorial (2x2+1), com tratamento adicional, sem a aplicação dos nutrientes. Cultivou-se pimentão, cultivar Mayata, em condições de ambiente protegido, durante 34 semanas. Após o pegamento das mudas, foi aplicado 1/6 dos nutrientes a cada dez dias. Ao final do ciclo, as formas de N nítrico e N amoniacal representaram melhor as doses do nutriente aplicados ao solo e não houve acidificação. As raízes tiveram significativo crescimento após a aplicação de N, enquanto que o aumento da dose de K, aplicado como KCl, prejudicou o crescimento radicular, provavelmente associado à alta concentração de K no solo e possíveis efeitos salinos, correspondendo a mais de 5,0 mmol c dm-3 e mais que 5,3% de saturação do K no complexo de troca, na camada superficial do solo. Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz2001-09-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://www.revistas.usp.br/sa/article/view/2164510.1590/S0103-90162001000300019Scientia Agricola; v. 58 n. 3 (2001); 561-566Scientia Agricola; Vol. 58 No. 3 (2001); 561-566Scientia Agricola; Vol. 58 Núm. 3 (2001); 561-5661678-992X0103-9016reponame:Scientia Agrícola (Online)instname:Universidade de São Paulo (USP)instacron:USPporhttps://www.revistas.usp.br/sa/article/view/21645/23669Copyright (c) 2015 Scientia Agricolainfo:eu-repo/semantics/openAccessSilva, Maria Anita Gonçalves daBoaretto, Antonio EnediFernandes, Henriqueta GimenesBoaretto, RodrigoMelo, Arlete Marchi Tavares deScivittaro, Walkyria Bueno2015-07-07T11:36:56Zoai:revistas.usp.br:article/21645Revistahttp://revistas.usp.br/sa/indexPUBhttps://old.scielo.br/oai/scielo-oai.phpscientia@usp.br||alleoni@usp.br1678-992X0103-9016opendoar:2015-07-07T11:36:56Scientia Agrícola (Online) - Universidade de São Paulo (USP)false |
dc.title.none.fl_str_mv |
Chemical characteristics of an Oxisol after urea and potassium chloride fertilization in a protected environment Características químicas de um latossolo adubado com uréia e cloreto de potássio em ambiente protegido |
title |
Chemical characteristics of an Oxisol after urea and potassium chloride fertilization in a protected environment |
spellingShingle |
Chemical characteristics of an Oxisol after urea and potassium chloride fertilization in a protected environment Silva, Maria Anita Gonçalves da Capsicum annuum adubação nitrogenada adubação potássica saturação de potássio Capsicum annuum nitrogen potassium potassium saturation |
title_short |
Chemical characteristics of an Oxisol after urea and potassium chloride fertilization in a protected environment |
title_full |
Chemical characteristics of an Oxisol after urea and potassium chloride fertilization in a protected environment |
title_fullStr |
Chemical characteristics of an Oxisol after urea and potassium chloride fertilization in a protected environment |
title_full_unstemmed |
Chemical characteristics of an Oxisol after urea and potassium chloride fertilization in a protected environment |
title_sort |
Chemical characteristics of an Oxisol after urea and potassium chloride fertilization in a protected environment |
author |
Silva, Maria Anita Gonçalves da |
author_facet |
Silva, Maria Anita Gonçalves da Boaretto, Antonio Enedi Fernandes, Henriqueta Gimenes Boaretto, Rodrigo Melo, Arlete Marchi Tavares de Scivittaro, Walkyria Bueno |
author_role |
author |
author2 |
Boaretto, Antonio Enedi Fernandes, Henriqueta Gimenes Boaretto, Rodrigo Melo, Arlete Marchi Tavares de Scivittaro, Walkyria Bueno |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Silva, Maria Anita Gonçalves da Boaretto, Antonio Enedi Fernandes, Henriqueta Gimenes Boaretto, Rodrigo Melo, Arlete Marchi Tavares de Scivittaro, Walkyria Bueno |
dc.subject.por.fl_str_mv |
Capsicum annuum adubação nitrogenada adubação potássica saturação de potássio Capsicum annuum nitrogen potassium potassium saturation |
topic |
Capsicum annuum adubação nitrogenada adubação potássica saturação de potássio Capsicum annuum nitrogen potassium potassium saturation |
description |
The production of healthy, high quality vegetables and the development of technologies for continuous supply to the market are important factors determining the adaption of protected cultivation systems by an increasing number of growers. Due to the little knowledge on soil management practices under these conditions, high fertilizer rates are normally applied, causing salinity problems and nutricional unbalances. The objective of this paper was to evaluate the effects of urea and potassium chloride applications on the chemical characteristics of an Eutrorthox, mainly on its acidity and potassium saturation. The N was applied in rates of 13.3 and 39.9g m-2 and the K in rates 5.5 and 16.6 g m-2, in a fatorial (2X2+1) design, including a control. Pepper plants (Capsicum annuum, Mayata cultivar) were grown under protected condition, during 34 weeks. After seedling rooting, the nutrients were applied at the rate of one sixth of the total at ten day intervals, up to 60 days. It was observed that urea did not acidify the soil probabily due to its high buffering capacity. The nitric and ammoniacal forms of N were directly effeted by the N rates applied in relation to the soil. In the treatment with N, the roots showed better development compared to the control. However, the highest K rate, applied as KCl, decreased root growth, probably due to the high soil K concentration and possible salinity effects, resulting in more than 5.0 mmol c dm-3 of K and more than 5.3% of K saturation in the exchange complex. |
publishDate |
2001 |
dc.date.none.fl_str_mv |
2001-09-01 |
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/21645 10.1590/S0103-90162001000300019 |
url |
https://www.revistas.usp.br/sa/article/view/21645 |
identifier_str_mv |
10.1590/S0103-90162001000300019 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
https://www.revistas.usp.br/sa/article/view/21645/23669 |
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. 58 n. 3 (2001); 561-566 Scientia Agricola; Vol. 58 No. 3 (2001); 561-566 Scientia Agricola; Vol. 58 Núm. 3 (2001); 561-566 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_ |
1787713252603461632 |