Comparison of optical sensors in assessing the nitrogen (N) status in corn

ABSTRACT Nitrogen (N) plays a key role for optimal plant growth and, in particular, for profitable crop production. Optimal N management using optical sensors can provide a rapid assessment of a crop N status. Therefore, this study aimed at comparing the efficiency of two chlorophyll meters in asses...

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Autores principales:	Nogueira Martins,Rodrigo, Pinto,Francisco de Assis de Carvalho, Rosas,Jorge Tadeu Fim, Santos,Fernando Ferreira Lima dos, Viana,Lucas de Arruda
Lenguaje:	English
Publicado:	Universidad de Tarapacá. Facultad de Ciencias Agronómicas 2020
Materias:	chlorophyll meter nitrogen sufficiency index site-specific fertilization Zea mays L. precision sensing
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-34292020000100067
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spelling	oai:scielo:S0718-342920200001000672020-07-30Comparison of optical sensors in assessing the nitrogen (N) status in cornNogueira Martins,RodrigoPinto,Francisco de Assis de CarvalhoRosas,Jorge Tadeu FimSantos,Fernando Ferreira Lima dosViana,Lucas de Arruda chlorophyll meter nitrogen sufficiency index site-specific fertilization Zea mays L. precision sensing ABSTRACT Nitrogen (N) plays a key role for optimal plant growth and, in particular, for profitable crop production. Optimal N management using optical sensors can provide a rapid assessment of a crop N status. Therefore, this study aimed at comparing the efficiency of two chlorophyll meters in assessing the N status in corn plants when using an economical optimum dose of nitrogen under variable rate application. To do so, a field experiment using a randomized block design with 5 treatments and 5 replicates was carried out in Januária - Brazil (15\| 28' 55" S, 44° 22' 41'' W; 474 m) in 2018. Treatments consisted of comparing the pre-fixed N fertilization system with three strategies of variable rate N application using different thresholds of the nitrogen sufficiency index (NSI) in the V4, V8, V10, and V14 vegetative stages. As a result, both chlorophyll meters were capable of detecting the need for N application and differentiating between the plants that received or did not receive N application. In addition, readings from both sensors were highly correlated (> 0.92) from the V6 to the V18 stage. Lastly, both chlorophyll meters were able to identify the crop development variability and could be a suitable tool to monitor the nutritional status and for guiding N fertilization in corn crops.info:eu-repo/semantics/openAccessUniversidad de Tarapacá. Facultad de Ciencias AgronómicasIdesia (Arica) v.38 n.1 20202020-03-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-34292020000100067en10.4067/S0718-34292020000100067
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	chlorophyll meter nitrogen sufficiency index site-specific fertilization Zea mays L. precision sensing
spellingShingle	chlorophyll meter nitrogen sufficiency index site-specific fertilization Zea mays L. precision sensing Nogueira Martins,Rodrigo Pinto,Francisco de Assis de Carvalho Rosas,Jorge Tadeu Fim Santos,Fernando Ferreira Lima dos Viana,Lucas de Arruda Comparison of optical sensors in assessing the nitrogen (N) status in corn
description	ABSTRACT Nitrogen (N) plays a key role for optimal plant growth and, in particular, for profitable crop production. Optimal N management using optical sensors can provide a rapid assessment of a crop N status. Therefore, this study aimed at comparing the efficiency of two chlorophyll meters in assessing the N status in corn plants when using an economical optimum dose of nitrogen under variable rate application. To do so, a field experiment using a randomized block design with 5 treatments and 5 replicates was carried out in Januária - Brazil (15\| 28' 55" S, 44° 22' 41'' W; 474 m) in 2018. Treatments consisted of comparing the pre-fixed N fertilization system with three strategies of variable rate N application using different thresholds of the nitrogen sufficiency index (NSI) in the V4, V8, V10, and V14 vegetative stages. As a result, both chlorophyll meters were capable of detecting the need for N application and differentiating between the plants that received or did not receive N application. In addition, readings from both sensors were highly correlated (> 0.92) from the V6 to the V18 stage. Lastly, both chlorophyll meters were able to identify the crop development variability and could be a suitable tool to monitor the nutritional status and for guiding N fertilization in corn crops.
author	Nogueira Martins,Rodrigo Pinto,Francisco de Assis de Carvalho Rosas,Jorge Tadeu Fim Santos,Fernando Ferreira Lima dos Viana,Lucas de Arruda
author_facet	Nogueira Martins,Rodrigo Pinto,Francisco de Assis de Carvalho Rosas,Jorge Tadeu Fim Santos,Fernando Ferreira Lima dos Viana,Lucas de Arruda
author_sort	Nogueira Martins,Rodrigo
title	Comparison of optical sensors in assessing the nitrogen (N) status in corn
title_short	Comparison of optical sensors in assessing the nitrogen (N) status in corn
title_full	Comparison of optical sensors in assessing the nitrogen (N) status in corn
title_fullStr	Comparison of optical sensors in assessing the nitrogen (N) status in corn
title_full_unstemmed	Comparison of optical sensors in assessing the nitrogen (N) status in corn
title_sort	comparison of optical sensors in assessing the nitrogen (n) status in corn
publisher	Universidad de Tarapacá. Facultad de Ciencias Agronómicas
publishDate	2020
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-34292020000100067
work_keys_str_mv	AT nogueiramartinsrodrigo comparisonofopticalsensorsinassessingthenitrogennstatusincorn AT pintofranciscodeassisdecarvalho comparisonofopticalsensorsinassessingthenitrogennstatusincorn AT rosasjorgetadeufim comparisonofopticalsensorsinassessingthenitrogennstatusincorn AT santosfernandoferreiralimados comparisonofopticalsensorsinassessingthenitrogennstatusincorn AT vianalucasdearruda comparisonofopticalsensorsinassessingthenitrogennstatusincorn
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Comparison of optical sensors in assessing the nitrogen (N) status in corn

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