Sufficiency index for defining nitrogen recommendation in brachiaria grass pasture
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Bioscience journal (Online) |
Texto Completo: | https://seer.ufu.br/index.php/biosciencejournal/article/view/26338 |
Resumo: | In addition to be absorbed by plants, nitrogen (N) applied in the soil is subject to loss by leaching, volatilization and microorganism immobilization. The spectral characteristics of plants have been used for defining the N fertilizer rate. However, it has been a challenge to translate the sensor readings into the N rate. Thus, the aim of the present study was to evaluate three spectral variables to recommend variable rate N fertilization in Brachiaria decumbens using the Nitrogen Sufficiency Index (NSI). The five treatments consisted of a control plot (without nitrogen application), a reference plot with a fixed N rate of 150 kg ha-1 and three different spectral readings for applying N at variable rates. In the variable rate plots were initially applied a N rate equal to 50% of that in the reference plot, and the following rates were defined based on NSI. The three spectral variables were: a portable chlorophyll meter readings, Visible Atmospherically Resistant Index (VARIRedEdge) and the ratio between Modified Chlorophyll Absorption Ratio Index and Optimized Soil Adjusted Vegetation Index (MCARI/OSAVI). The experiment was conducted in randomized block design with five replicates during three plant harvesting. The forage was harvested when the plant height was 25 cm in the reference plot. The variable rate treatments presented better nitrogen use efficiency than the fixed rate treatment. The portable chlorophyll meter was more suitable than the used vegetation indices to recommend variable N rate fertilization since their plots produced the same dry biomass matter as in the fixed rate plot with less amount of fertilizer applied. |
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Sufficiency index for defining nitrogen recommendation in brachiaria grass pasture Sufficiency index for defining nitrogen recommendation in brachiaria grass pasture portable chlorophyll meterprecision farmingremote sensingspectral vegetation indexvariable rate technologyAgricultural SciencesIn addition to be absorbed by plants, nitrogen (N) applied in the soil is subject to loss by leaching, volatilization and microorganism immobilization. The spectral characteristics of plants have been used for defining the N fertilizer rate. However, it has been a challenge to translate the sensor readings into the N rate. Thus, the aim of the present study was to evaluate three spectral variables to recommend variable rate N fertilization in Brachiaria decumbens using the Nitrogen Sufficiency Index (NSI). The five treatments consisted of a control plot (without nitrogen application), a reference plot with a fixed N rate of 150 kg ha-1 and three different spectral readings for applying N at variable rates. In the variable rate plots were initially applied a N rate equal to 50% of that in the reference plot, and the following rates were defined based on NSI. The three spectral variables were: a portable chlorophyll meter readings, Visible Atmospherically Resistant Index (VARIRedEdge) and the ratio between Modified Chlorophyll Absorption Ratio Index and Optimized Soil Adjusted Vegetation Index (MCARI/OSAVI). The experiment was conducted in randomized block design with five replicates during three plant harvesting. The forage was harvested when the plant height was 25 cm in the reference plot. The variable rate treatments presented better nitrogen use efficiency than the fixed rate treatment. The portable chlorophyll meter was more suitable than the used vegetation indices to recommend variable N rate fertilization since their plots produced the same dry biomass matter as in the fixed rate plot with less amount of fertilizer applied.In addition to be absorbed by plants, nitrogen (N) applied in the soil is subject to loss by leaching, volatilization and microorganism immobilization. The spectral characteristics of plants have been used for defining the N fertilizer rate. However, it has been a challenge to translate the sensor readings into the N rate. Thus, the aim of the present study was to evaluate three spectral variables to recommend variable rate N fertilization in Brachiaria decumbens using the Nitrogen Sufficiency Index (NSI). The five treatments consisted of a control plot (without nitrogen application), a reference plot with a fixed N rate of 150 kg ha-1 and three different spectral readings for applying N at variable rates. In the variable rate plots were initially applied a N rate equal to 50% of that in the reference plot, and the following rates were defined based on NSI. The three spectral variables were: a portable chlorophyll meter readings, Visible Atmospherically Resistant Index (VARIRedEdge) and the ratio between Modified Chlorophyll Absorption Ratio Index and Optimized Soil Adjusted Vegetation Index (MCARI/OSAVI). The experiment was conducted in randomized block design with five replicates during three plant harvesting. The forage was harvested when the plant height was 25 cm in the reference plot. The variable rate treatments presented better nitrogen use efficiency than the fixed rate treatment. The portable chlorophyll meter was more suitable than the used vegetation indices to recommend variable N rate fertilization since their plots produced the same dry biomass matter as in the fixed rate plot with less amount of fertilizer applied.EDUFU2015-09-10info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.ufu.br/index.php/biosciencejournal/article/view/2633810.14393/BJ-v31n5a2015-26338Bioscience Journal ; Vol. 31 No. 5 (2015): Sept./Oct.; 1333-1340Bioscience Journal ; v. 31 n. 5 (2015): Sept./Oct.; 1333-13401981-3163reponame:Bioscience journal (Online)instname:Universidade Federal de Uberlândia (UFU)instacron:UFUenghttps://seer.ufu.br/index.php/biosciencejournal/article/view/26338/17118Brazil; ContemporaryCopyright (c) 2015 Flora Maria de Melo Villar, Francisco de Assis de Carvalho Pinto, Dilermando Miranda da Fonseca, Daniel Marçal de Queiroz, Gracielly Ribeiro de Alcântarahttps://creativecommons.org/licenses/by/4.0info:eu-repo/semantics/openAccessVillar, Flora Maria de MeloPinto, Francisco de Assis de CarvalhoFonseca, Dilermando Miranda daQueiroz, Daniel Marçal deAlcântara, Gracielly Ribeiro de2022-05-19T13:28:02Zoai:ojs.www.seer.ufu.br:article/26338Revistahttps://seer.ufu.br/index.php/biosciencejournalPUBhttps://seer.ufu.br/index.php/biosciencejournal/oaibiosciencej@ufu.br||1981-31631516-3725opendoar:2022-05-19T13:28:02Bioscience journal (Online) - Universidade Federal de Uberlândia (UFU)false |
dc.title.none.fl_str_mv |
Sufficiency index for defining nitrogen recommendation in brachiaria grass pasture Sufficiency index for defining nitrogen recommendation in brachiaria grass pasture |
title |
Sufficiency index for defining nitrogen recommendation in brachiaria grass pasture |
spellingShingle |
Sufficiency index for defining nitrogen recommendation in brachiaria grass pasture Villar, Flora Maria de Melo portable chlorophyll meter precision farming remote sensing spectral vegetation index variable rate technology Agricultural Sciences |
title_short |
Sufficiency index for defining nitrogen recommendation in brachiaria grass pasture |
title_full |
Sufficiency index for defining nitrogen recommendation in brachiaria grass pasture |
title_fullStr |
Sufficiency index for defining nitrogen recommendation in brachiaria grass pasture |
title_full_unstemmed |
Sufficiency index for defining nitrogen recommendation in brachiaria grass pasture |
title_sort |
Sufficiency index for defining nitrogen recommendation in brachiaria grass pasture |
author |
Villar, Flora Maria de Melo |
author_facet |
Villar, Flora Maria de Melo Pinto, Francisco de Assis de Carvalho Fonseca, Dilermando Miranda da Queiroz, Daniel Marçal de Alcântara, Gracielly Ribeiro de |
author_role |
author |
author2 |
Pinto, Francisco de Assis de Carvalho Fonseca, Dilermando Miranda da Queiroz, Daniel Marçal de Alcântara, Gracielly Ribeiro de |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Villar, Flora Maria de Melo Pinto, Francisco de Assis de Carvalho Fonseca, Dilermando Miranda da Queiroz, Daniel Marçal de Alcântara, Gracielly Ribeiro de |
dc.subject.por.fl_str_mv |
portable chlorophyll meter precision farming remote sensing spectral vegetation index variable rate technology Agricultural Sciences |
topic |
portable chlorophyll meter precision farming remote sensing spectral vegetation index variable rate technology Agricultural Sciences |
description |
In addition to be absorbed by plants, nitrogen (N) applied in the soil is subject to loss by leaching, volatilization and microorganism immobilization. The spectral characteristics of plants have been used for defining the N fertilizer rate. However, it has been a challenge to translate the sensor readings into the N rate. Thus, the aim of the present study was to evaluate three spectral variables to recommend variable rate N fertilization in Brachiaria decumbens using the Nitrogen Sufficiency Index (NSI). The five treatments consisted of a control plot (without nitrogen application), a reference plot with a fixed N rate of 150 kg ha-1 and three different spectral readings for applying N at variable rates. In the variable rate plots were initially applied a N rate equal to 50% of that in the reference plot, and the following rates were defined based on NSI. The three spectral variables were: a portable chlorophyll meter readings, Visible Atmospherically Resistant Index (VARIRedEdge) and the ratio between Modified Chlorophyll Absorption Ratio Index and Optimized Soil Adjusted Vegetation Index (MCARI/OSAVI). The experiment was conducted in randomized block design with five replicates during three plant harvesting. The forage was harvested when the plant height was 25 cm in the reference plot. The variable rate treatments presented better nitrogen use efficiency than the fixed rate treatment. The portable chlorophyll meter was more suitable than the used vegetation indices to recommend variable N rate fertilization since their plots produced the same dry biomass matter as in the fixed rate plot with less amount of fertilizer applied. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-09-10 |
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.ufu.br/index.php/biosciencejournal/article/view/26338 10.14393/BJ-v31n5a2015-26338 |
url |
https://seer.ufu.br/index.php/biosciencejournal/article/view/26338 |
identifier_str_mv |
10.14393/BJ-v31n5a2015-26338 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
https://seer.ufu.br/index.php/biosciencejournal/article/view/26338/17118 |
dc.rights.driver.fl_str_mv |
https://creativecommons.org/licenses/by/4.0 info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by/4.0 |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.coverage.none.fl_str_mv |
Brazil; Contemporary |
dc.publisher.none.fl_str_mv |
EDUFU |
publisher.none.fl_str_mv |
EDUFU |
dc.source.none.fl_str_mv |
Bioscience Journal ; Vol. 31 No. 5 (2015): Sept./Oct.; 1333-1340 Bioscience Journal ; v. 31 n. 5 (2015): Sept./Oct.; 1333-1340 1981-3163 reponame:Bioscience journal (Online) instname:Universidade Federal de Uberlândia (UFU) instacron:UFU |
instname_str |
Universidade Federal de Uberlândia (UFU) |
instacron_str |
UFU |
institution |
UFU |
reponame_str |
Bioscience journal (Online) |
collection |
Bioscience journal (Online) |
repository.name.fl_str_mv |
Bioscience journal (Online) - Universidade Federal de Uberlândia (UFU) |
repository.mail.fl_str_mv |
biosciencej@ufu.br|| |
_version_ |
1797069075299434496 |