Critical values of nitrogen indices in tomato plants grown in soil and nutrient solution determined by different statistical procedures

Detalhes bibliográficos
Autor(a) principal: Fontes, Paulo Cezar Rezende
Data de Publicação: 2002
Outros Autores: Ronchi, Cláudio Pagotto
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Pesquisa Agropecuária Brasileira (Online)
Texto Completo: https://seer.sct.embrapa.br/index.php/pab/article/view/6486
Resumo: The objective of this study was to establish critical values of the N indices, namely soil-plant analysis development (SPAD), petiole sap N-NO3 and organic N in the tomato leaf adjacent to the first cluster (LAC), under soil and nutrient solution conditions, determined by different statistical approaches. Two experiments were conducted in randomized complete block design with four repli-cations. Tomato plants were grown in soil, in 3 L pot, with five N rates (0, 100, 200, 400 and 800 mg kg-1) and in solution at N rates of 0, 4, 8, 12 and 16 mmol L-1. Experiments in nutrient solution and soil were finished at thirty seven and forty two days after transplanting, respectively. At those times, SPAD index and petiole sap N-NO3 were evaluated in the LAC. Then, plants were harvested, separated in leaves and stem, dried at 70oC, ground and weighted. The organic N was determined in LAC dry matter. Three statistical procedures were used to calculate critical N values. There were accentuated discrepancies for critical values of N indices obtained with plants grown in soil and nutrient solution as well as for different statistical procedures. Critical values of nitrogen indices at all situations are presented.
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spelling Critical values of nitrogen indices in tomato plants grown in soil and nutrient solution determined by different statistical proceduresNíveis críticos de índices de nitrogênio no tomateiro em solo e solução nutritiva determinados por diferentes procedimentos estatísticosLycopersicon esculentum; nitrogen fertilizers; plant soil relations; statistical analysisLycopersicon esculentum; adubo nitrogenado; relação planta-solo; análise estatísticaThe objective of this study was to establish critical values of the N indices, namely soil-plant analysis development (SPAD), petiole sap N-NO3 and organic N in the tomato leaf adjacent to the first cluster (LAC), under soil and nutrient solution conditions, determined by different statistical approaches. Two experiments were conducted in randomized complete block design with four repli-cations. Tomato plants were grown in soil, in 3 L pot, with five N rates (0, 100, 200, 400 and 800 mg kg-1) and in solution at N rates of 0, 4, 8, 12 and 16 mmol L-1. Experiments in nutrient solution and soil were finished at thirty seven and forty two days after transplanting, respectively. At those times, SPAD index and petiole sap N-NO3 were evaluated in the LAC. Then, plants were harvested, separated in leaves and stem, dried at 70oC, ground and weighted. The organic N was determined in LAC dry matter. Three statistical procedures were used to calculate critical N values. There were accentuated discrepancies for critical values of N indices obtained with plants grown in soil and nutrient solution as well as for different statistical procedures. Critical values of nitrogen indices at all situations are presented.O objetivo deste trabalho foi estabelecer os níveis críticos dos índices de N, SPAD ("soil-plant analysis development"), N-NO3 na seiva do pecíolo e N orgânico na folha adjacente ao primeiro cacho do tomateiro (FAC), em solo e em solução nutritiva, determinados por diferentes procedimentos estatísticos. Foram conduzidos dois experimentos no delineamento em blocos casualizados, com quatro repetições. As plantas foram cultivadas em vasos contendo 3 L de solo, com cinco níveis de N (0, 100, 200, 400 e 800 mg kg-1) e, também, em solução nutritiva com 0, 4, 8, 12 e 16 mmol L-1 de nitrogênio. Os experimentos em solução e em solo foram encerrados aos 37 e 42 dias após o transplante, respectivamente. Nesta ocasião, o índice SPAD e o teor de N-NO3 foram determinados na FAC. Em seguida, as plantas foram colhidas, separadas em folhas e pecíolos, secadas a 70ºC, moídas e pesadas. Na matéria seca da FAC, foi determinado o N orgânico. Três procedimentos estatísticos foram utilizados para calcular o nível crítico. Verificaram-se acentuadas discrepâncias no valor do nível crítico dos índices de N obtidos com as plantas em solo e em solução nutritiva assim como utilizando-se diferentes procedimentos estatísticos. São apresentados os níveis críticos dos índices de N nas diversas situações.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraFontes, Paulo Cezar RezendeRonchi, Cláudio Pagotto2002-10-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/6486Pesquisa Agropecuaria Brasileira; v.37, n.10, out. 2002; 1421-1429Pesquisa Agropecuária Brasileira; v.37, n.10, out. 2002; 1421-14291678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAenghttps://seer.sct.embrapa.br/index.php/pab/article/view/6486/3543info:eu-repo/semantics/openAccess2014-07-22T17:54:04Zoai:ojs.seer.sct.embrapa.br:article/6486Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2014-07-22T17:54:04Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv Critical values of nitrogen indices in tomato plants grown in soil and nutrient solution determined by different statistical procedures
Níveis críticos de índices de nitrogênio no tomateiro em solo e solução nutritiva determinados por diferentes procedimentos estatísticos
title Critical values of nitrogen indices in tomato plants grown in soil and nutrient solution determined by different statistical procedures
spellingShingle Critical values of nitrogen indices in tomato plants grown in soil and nutrient solution determined by different statistical procedures
Fontes, Paulo Cezar Rezende
Lycopersicon esculentum; nitrogen fertilizers; plant soil relations; statistical analysis
Lycopersicon esculentum; adubo nitrogenado; relação planta-solo; análise estatística
title_short Critical values of nitrogen indices in tomato plants grown in soil and nutrient solution determined by different statistical procedures
title_full Critical values of nitrogen indices in tomato plants grown in soil and nutrient solution determined by different statistical procedures
title_fullStr Critical values of nitrogen indices in tomato plants grown in soil and nutrient solution determined by different statistical procedures
title_full_unstemmed Critical values of nitrogen indices in tomato plants grown in soil and nutrient solution determined by different statistical procedures
title_sort Critical values of nitrogen indices in tomato plants grown in soil and nutrient solution determined by different statistical procedures
author Fontes, Paulo Cezar Rezende
author_facet Fontes, Paulo Cezar Rezende
Ronchi, Cláudio Pagotto
author_role author
author2 Ronchi, Cláudio Pagotto
author2_role author
dc.contributor.none.fl_str_mv

dc.contributor.author.fl_str_mv Fontes, Paulo Cezar Rezende
Ronchi, Cláudio Pagotto
dc.subject.por.fl_str_mv Lycopersicon esculentum; nitrogen fertilizers; plant soil relations; statistical analysis
Lycopersicon esculentum; adubo nitrogenado; relação planta-solo; análise estatística
topic Lycopersicon esculentum; nitrogen fertilizers; plant soil relations; statistical analysis
Lycopersicon esculentum; adubo nitrogenado; relação planta-solo; análise estatística
description The objective of this study was to establish critical values of the N indices, namely soil-plant analysis development (SPAD), petiole sap N-NO3 and organic N in the tomato leaf adjacent to the first cluster (LAC), under soil and nutrient solution conditions, determined by different statistical approaches. Two experiments were conducted in randomized complete block design with four repli-cations. Tomato plants were grown in soil, in 3 L pot, with five N rates (0, 100, 200, 400 and 800 mg kg-1) and in solution at N rates of 0, 4, 8, 12 and 16 mmol L-1. Experiments in nutrient solution and soil were finished at thirty seven and forty two days after transplanting, respectively. At those times, SPAD index and petiole sap N-NO3 were evaluated in the LAC. Then, plants were harvested, separated in leaves and stem, dried at 70oC, ground and weighted. The organic N was determined in LAC dry matter. Three statistical procedures were used to calculate critical N values. There were accentuated discrepancies for critical values of N indices obtained with plants grown in soil and nutrient solution as well as for different statistical procedures. Critical values of nitrogen indices at all situations are presented.
publishDate 2002
dc.date.none.fl_str_mv 2002-10-01
dc.type.none.fl_str_mv
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://seer.sct.embrapa.br/index.php/pab/article/view/6486
url https://seer.sct.embrapa.br/index.php/pab/article/view/6486
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv https://seer.sct.embrapa.br/index.php/pab/article/view/6486/3543
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 Pesquisa Agropecuaria Brasileira
Pesquisa Agropecuária Brasileira
publisher.none.fl_str_mv Pesquisa Agropecuaria Brasileira
Pesquisa Agropecuária Brasileira
dc.source.none.fl_str_mv Pesquisa Agropecuaria Brasileira; v.37, n.10, out. 2002; 1421-1429
Pesquisa Agropecuária Brasileira; v.37, n.10, out. 2002; 1421-1429
1678-3921
0100-104x
reponame:Pesquisa Agropecuária Brasileira (Online)
instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron:EMBRAPA
instname_str Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron_str EMBRAPA
institution EMBRAPA
reponame_str Pesquisa Agropecuária Brasileira (Online)
collection Pesquisa Agropecuária Brasileira (Online)
repository.name.fl_str_mv Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
repository.mail.fl_str_mv pab@sct.embrapa.br || sct.pab@embrapa.br
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