Nitrogen fertilizing in corn based in chlorophyll meter reading and sufficiency index in nitrogen
Autor(a) principal: | |
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Data de Publicação: | 2008 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Acta Scientiarum. Agronomy (Online) |
Texto Completo: | http://www.periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/1985 |
Resumo: | An experiment was carried out in Botucatu, state of São Paulo, Brazil, to evaluate the use of chlorophyll meter reading, in nitrogen necessity prediction in corn, Zea mays L., through a nitrogen sufficiency index (NSI). NSI was calculated at four (V4), seven (V7), ten (V10) leaves stage and in tasseling, dividing the measure of the chlorophyll meter reading in the plot by the measure in an area that received a high N rate (200kg N ha-1). One day before the planting, 0 and 60kg ha-1 were applied. (kg N ha-1) were applied in plots that did not receive N: 0; 60 in V4 and 40 in V7; 42 in V4 and 28 in V7; 20 and 35kg N ha-1 when the NSI < 0,95. (kg N ha-1) were applied in plots that received N: 24 in V4 and 16 in V7; 20 and 35kg N ha-1 when NSI < 0,95. The use of NSI allowed to define when N should be applied by starting from seven leaves stage. |
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Acta Scientiarum. Agronomy (Online) |
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Nitrogen fertilizing in corn based in chlorophyll meter reading and sufficiency index in nitrogenAdubação nitrogenada na cultura do milho baseada na medida do clorofilômetro e no índice de suficiência em nitrogênio (ISN) - DOI: 10.4025/actasciagron.v25i2.1985Zea mays L.clorofilaSPADárea de referência5.00.00.00-4 Ciências AgráriasAn experiment was carried out in Botucatu, state of São Paulo, Brazil, to evaluate the use of chlorophyll meter reading, in nitrogen necessity prediction in corn, Zea mays L., through a nitrogen sufficiency index (NSI). NSI was calculated at four (V4), seven (V7), ten (V10) leaves stage and in tasseling, dividing the measure of the chlorophyll meter reading in the plot by the measure in an area that received a high N rate (200kg N ha-1). One day before the planting, 0 and 60kg ha-1 were applied. (kg N ha-1) were applied in plots that did not receive N: 0; 60 in V4 and 40 in V7; 42 in V4 and 28 in V7; 20 and 35kg N ha-1 when the NSI < 0,95. (kg N ha-1) were applied in plots that received N: 24 in V4 and 16 in V7; 20 and 35kg N ha-1 when NSI < 0,95. The use of NSI allowed to define when N should be applied by starting from seven leaves stage.Foi conduzido um experimento em Botucatu, Estado de São Paulo, para avaliar a utilização do clorofilômetro, na predição da necessidade de N na cultura do milho, Zea mays L., através do índice de suficiência em N (ISN). O ISN foi calculado nos estádios de quatro (V4), sete (V7), dez (V10) folhas e no pendoamento, dividindo a medida do clorofilômetro na parcela pela medida numa área que recebeu uma alta dose de N (200kg ha-1). Um dia antes da semeadura, foram aplicados 0 e 60kg N ha-1. Nas parcelas que não receberam N foram aplicados (kg N ha-1): 0; 60 em V4 e 40 em V7; 42 em V4 e 28 em V7; 20 e 35 quando ISN < 0,95. Nas parcelas que receberam N aplicaram-se (kg N ha-1): 24 em V4 e 16 em V7; 20 e 35 quando ISN < 0,95. A utilização do ISN permitiu definir quando aplicar o N iniciando do estádio de sete folhas.Universidade Estadual de Maringá2008-04-23info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://www.periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/198510.4025/actasciagron.v25i2.1985Acta Scientiarum. Agronomy; Vol 25 No 2 (2003); 373-380Acta Scientiarum. Agronomy; v. 25 n. 2 (2003); 373-3801807-86211679-9275reponame:Acta Scientiarum. Agronomy (Online)instname:Universidade Estadual de Maringá (UEM)instacron:UEMporhttp://www.periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/1985/1602Godoy, Leandro José Grava deBôas, Roberto Lyra VillasGrassi Filho, Hélioinfo:eu-repo/semantics/openAccess2022-11-23T18:37:40Zoai:periodicos.uem.br/ojs:article/1985Revistahttp://www.periodicos.uem.br/ojs/index.php/ActaSciAgronPUBhttp://www.periodicos.uem.br/ojs/index.php/ActaSciAgron/oaiactaagron@uem.br||actaagron@uem.br|| edamasio@uem.br1807-86211679-9275opendoar:2022-11-23T18:37:40Acta Scientiarum. Agronomy (Online) - Universidade Estadual de Maringá (UEM)false |
dc.title.none.fl_str_mv |
Nitrogen fertilizing in corn based in chlorophyll meter reading and sufficiency index in nitrogen Adubação nitrogenada na cultura do milho baseada na medida do clorofilômetro e no índice de suficiência em nitrogênio (ISN) - DOI: 10.4025/actasciagron.v25i2.1985 |
title |
Nitrogen fertilizing in corn based in chlorophyll meter reading and sufficiency index in nitrogen |
spellingShingle |
Nitrogen fertilizing in corn based in chlorophyll meter reading and sufficiency index in nitrogen Godoy, Leandro José Grava de Zea mays L. clorofila SPAD área de referência 5.00.00.00-4 Ciências Agrárias |
title_short |
Nitrogen fertilizing in corn based in chlorophyll meter reading and sufficiency index in nitrogen |
title_full |
Nitrogen fertilizing in corn based in chlorophyll meter reading and sufficiency index in nitrogen |
title_fullStr |
Nitrogen fertilizing in corn based in chlorophyll meter reading and sufficiency index in nitrogen |
title_full_unstemmed |
Nitrogen fertilizing in corn based in chlorophyll meter reading and sufficiency index in nitrogen |
title_sort |
Nitrogen fertilizing in corn based in chlorophyll meter reading and sufficiency index in nitrogen |
author |
Godoy, Leandro José Grava de |
author_facet |
Godoy, Leandro José Grava de Bôas, Roberto Lyra Villas Grassi Filho, Hélio |
author_role |
author |
author2 |
Bôas, Roberto Lyra Villas Grassi Filho, Hélio |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Godoy, Leandro José Grava de Bôas, Roberto Lyra Villas Grassi Filho, Hélio |
dc.subject.por.fl_str_mv |
Zea mays L. clorofila SPAD área de referência 5.00.00.00-4 Ciências Agrárias |
topic |
Zea mays L. clorofila SPAD área de referência 5.00.00.00-4 Ciências Agrárias |
description |
An experiment was carried out in Botucatu, state of São Paulo, Brazil, to evaluate the use of chlorophyll meter reading, in nitrogen necessity prediction in corn, Zea mays L., through a nitrogen sufficiency index (NSI). NSI was calculated at four (V4), seven (V7), ten (V10) leaves stage and in tasseling, dividing the measure of the chlorophyll meter reading in the plot by the measure in an area that received a high N rate (200kg N ha-1). One day before the planting, 0 and 60kg ha-1 were applied. (kg N ha-1) were applied in plots that did not receive N: 0; 60 in V4 and 40 in V7; 42 in V4 and 28 in V7; 20 and 35kg N ha-1 when the NSI < 0,95. (kg N ha-1) were applied in plots that received N: 24 in V4 and 16 in V7; 20 and 35kg N ha-1 when NSI < 0,95. The use of NSI allowed to define when N should be applied by starting from seven leaves stage. |
publishDate |
2008 |
dc.date.none.fl_str_mv |
2008-04-23 |
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 |
http://www.periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/1985 10.4025/actasciagron.v25i2.1985 |
url |
http://www.periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/1985 |
identifier_str_mv |
10.4025/actasciagron.v25i2.1985 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
http://www.periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/1985/1602 |
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 |
Universidade Estadual de Maringá |
publisher.none.fl_str_mv |
Universidade Estadual de Maringá |
dc.source.none.fl_str_mv |
Acta Scientiarum. Agronomy; Vol 25 No 2 (2003); 373-380 Acta Scientiarum. Agronomy; v. 25 n. 2 (2003); 373-380 1807-8621 1679-9275 reponame:Acta Scientiarum. Agronomy (Online) instname:Universidade Estadual de Maringá (UEM) instacron:UEM |
instname_str |
Universidade Estadual de Maringá (UEM) |
instacron_str |
UEM |
institution |
UEM |
reponame_str |
Acta Scientiarum. Agronomy (Online) |
collection |
Acta Scientiarum. Agronomy (Online) |
repository.name.fl_str_mv |
Acta Scientiarum. Agronomy (Online) - Universidade Estadual de Maringá (UEM) |
repository.mail.fl_str_mv |
actaagron@uem.br||actaagron@uem.br|| edamasio@uem.br |
_version_ |
1799305904694231040 |