Nitrogen sufficiency index for estimating nitrogen fertilizer requirement of irrigated rice
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Revista Ceres |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0034-737X2019000600422 |
Resumo: | ABSTRACT The proper nitrogen management is required to achieve high irrigated rice yield. This study aimed to determine the rice response to nitrogen topdressing doses and calibrate the chlorophyll meter reading. Three experiments were conducted in a randomized block design. In the first experiment, five N rates (0, 30, 60, 90, and 120 kg ha-1) were evaluated as the first, and 30 kg ha-1 N as the second topdressing, which were combined with the application of 30 kg ha-1 N as the first and five N rates, as the second topdressing. The other experiments assessed the application of 30 kg ha-1 of N, as the first, and four N rates (0, 40, 80, and 120 kg ha-1), as the second topdressing. There was a response to N application, with maximum technical efficiency reaching 33 kg ha-1 in the first and between 40 and 50 kg ha-1 in the second topdressing. The chlorophyll meter was sensitive to estimate the amount of N to be applied in topdressing, using the nitrogen sufficiency index (NSI). To each percent unit of NSI below 95%, one should apply 10 kg ha-1 of N as the first and 2-3 kg ha-1 of N as the second topdressing. |
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Nitrogen sufficiency index for estimating nitrogen fertilizer requirement of irrigated riceOryza sativa L.N managementgrain yieldnitrogen topdressingchlorophyll meter.ABSTRACT The proper nitrogen management is required to achieve high irrigated rice yield. This study aimed to determine the rice response to nitrogen topdressing doses and calibrate the chlorophyll meter reading. Three experiments were conducted in a randomized block design. In the first experiment, five N rates (0, 30, 60, 90, and 120 kg ha-1) were evaluated as the first, and 30 kg ha-1 N as the second topdressing, which were combined with the application of 30 kg ha-1 N as the first and five N rates, as the second topdressing. The other experiments assessed the application of 30 kg ha-1 of N, as the first, and four N rates (0, 40, 80, and 120 kg ha-1), as the second topdressing. There was a response to N application, with maximum technical efficiency reaching 33 kg ha-1 in the first and between 40 and 50 kg ha-1 in the second topdressing. The chlorophyll meter was sensitive to estimate the amount of N to be applied in topdressing, using the nitrogen sufficiency index (NSI). To each percent unit of NSI below 95%, one should apply 10 kg ha-1 of N as the first and 2-3 kg ha-1 of N as the second topdressing.Universidade Federal de Viçosa2019-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0034-737X2019000600422Revista Ceres v.66 n.6 2019reponame:Revista Ceresinstname:Universidade Federal de Viçosa (UFV)instacron:UFV10.1590/0034-737x201966060003info:eu-repo/semantics/openAccessSantos,Alberto Baêta dosSilva,Mellissa Ananias Soler daSilveira,Pedro Marques daCarvalho,Glaucilene DuarteStone,Luís Fernandoeng2019-11-28T00:00:00ZRevista |
dc.title.none.fl_str_mv |
Nitrogen sufficiency index for estimating nitrogen fertilizer requirement of irrigated rice |
title |
Nitrogen sufficiency index for estimating nitrogen fertilizer requirement of irrigated rice |
spellingShingle |
Nitrogen sufficiency index for estimating nitrogen fertilizer requirement of irrigated rice Santos,Alberto Baêta dos Oryza sativa L. N management grain yield nitrogen topdressing chlorophyll meter. |
title_short |
Nitrogen sufficiency index for estimating nitrogen fertilizer requirement of irrigated rice |
title_full |
Nitrogen sufficiency index for estimating nitrogen fertilizer requirement of irrigated rice |
title_fullStr |
Nitrogen sufficiency index for estimating nitrogen fertilizer requirement of irrigated rice |
title_full_unstemmed |
Nitrogen sufficiency index for estimating nitrogen fertilizer requirement of irrigated rice |
title_sort |
Nitrogen sufficiency index for estimating nitrogen fertilizer requirement of irrigated rice |
author |
Santos,Alberto Baêta dos |
author_facet |
Santos,Alberto Baêta dos Silva,Mellissa Ananias Soler da Silveira,Pedro Marques da Carvalho,Glaucilene Duarte Stone,Luís Fernando |
author_role |
author |
author2 |
Silva,Mellissa Ananias Soler da Silveira,Pedro Marques da Carvalho,Glaucilene Duarte Stone,Luís Fernando |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Santos,Alberto Baêta dos Silva,Mellissa Ananias Soler da Silveira,Pedro Marques da Carvalho,Glaucilene Duarte Stone,Luís Fernando |
dc.subject.por.fl_str_mv |
Oryza sativa L. N management grain yield nitrogen topdressing chlorophyll meter. |
topic |
Oryza sativa L. N management grain yield nitrogen topdressing chlorophyll meter. |
dc.description.none.fl_txt_mv |
ABSTRACT The proper nitrogen management is required to achieve high irrigated rice yield. This study aimed to determine the rice response to nitrogen topdressing doses and calibrate the chlorophyll meter reading. Three experiments were conducted in a randomized block design. In the first experiment, five N rates (0, 30, 60, 90, and 120 kg ha-1) were evaluated as the first, and 30 kg ha-1 N as the second topdressing, which were combined with the application of 30 kg ha-1 N as the first and five N rates, as the second topdressing. The other experiments assessed the application of 30 kg ha-1 of N, as the first, and four N rates (0, 40, 80, and 120 kg ha-1), as the second topdressing. There was a response to N application, with maximum technical efficiency reaching 33 kg ha-1 in the first and between 40 and 50 kg ha-1 in the second topdressing. The chlorophyll meter was sensitive to estimate the amount of N to be applied in topdressing, using the nitrogen sufficiency index (NSI). To each percent unit of NSI below 95%, one should apply 10 kg ha-1 of N as the first and 2-3 kg ha-1 of N as the second topdressing. |
description |
ABSTRACT The proper nitrogen management is required to achieve high irrigated rice yield. This study aimed to determine the rice response to nitrogen topdressing doses and calibrate the chlorophyll meter reading. Three experiments were conducted in a randomized block design. In the first experiment, five N rates (0, 30, 60, 90, and 120 kg ha-1) were evaluated as the first, and 30 kg ha-1 N as the second topdressing, which were combined with the application of 30 kg ha-1 N as the first and five N rates, as the second topdressing. The other experiments assessed the application of 30 kg ha-1 of N, as the first, and four N rates (0, 40, 80, and 120 kg ha-1), as the second topdressing. There was a response to N application, with maximum technical efficiency reaching 33 kg ha-1 in the first and between 40 and 50 kg ha-1 in the second topdressing. The chlorophyll meter was sensitive to estimate the amount of N to be applied in topdressing, using the nitrogen sufficiency index (NSI). To each percent unit of NSI below 95%, one should apply 10 kg ha-1 of N as the first and 2-3 kg ha-1 of N as the second topdressing. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-12-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0034-737X2019000600422 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0034-737X2019000600422 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/0034-737x201966060003 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Universidade Federal de Viçosa |
publisher.none.fl_str_mv |
Universidade Federal de Viçosa |
dc.source.none.fl_str_mv |
Revista Ceres v.66 n.6 2019 reponame:Revista Ceres instname:Universidade Federal de Viçosa (UFV) instacron:UFV |
instname_str |
Universidade Federal de Viçosa (UFV) |
instacron_str |
UFV |
institution |
UFV |
reponame_str |
Revista Ceres |
collection |
Revista Ceres |
repository.name.fl_str_mv |
|
repository.mail.fl_str_mv |
|
_version_ |
1728006783517065216 |