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| 9. |  | BERRUETA, C.; GARCIA, C.; GRASSO, R. Sodium accumulation vs. nitrate leaching under different fertigation regimes in greenhouse soils in South Uruguay. [Acumulación de sodio vs. lavado de nitrógeno en suelos bajo invernadero en el sur de Uruguay con diferentes regímenes de fertirriego.]. [Acúmulo de sódio vs. lixiviação de nitrogênio sob solos de estufas no sul do Uruguai com diferentes regimes de fertirrigação.]. Advances in Water in Agroscience. Irrigation and water management. Agrociencia Uruguay, 2023, Vol.27(NE1), e1189. https://doi.org/10.31285/AGRO.27.1189 -- OPEN ACCESS. Article history: Received 24 April 2023; Accepted 21 September 2023; Published 06 February 2024. -- Editor: Álvaro Otero, Instituto Nacional de Investigación Agropecuaria (INIA), Salto, Uruguay. -- Correspondence: Cecilia Berrueta,...| Biblioteca(s): INIA Las Brujas. |
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| 19. | | OTERO, A.; GOÑI, C.; GRASSO, R.; MACHADO, D.; RIVAS, F. Water productivity associated to the planting system in young Nadorcott mandarin plants. [Productividad del agua asociada al sistema de plantación en plantas jóvenes de mandarina Nadorcott.]. [Produtividade hídrica em relação ao sistema de plantio em plantas jovens de tangerineira Nadorcott.]. Advances in Water in Agroscience. Irrigation and water management. Agrociencia Uruguay, 2023, Vol.27(NE1), e1188. https://doi.org/10.31285/AGRO.27.1188 -- OPEN ACCESS. Article history: Received 29 April 2023; Accepted 23 August 2023; Published 06 February 2024. -- Editor: Lucía Puppo, Universidad de la República, Montevideo, Uruguay. -- Correspondence: Álvaro Otero, aotero@inia.org.uy -- License: This...| Biblioteca(s): INIA Las Brujas. |
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Registro completo
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Biblioteca (s) : |
INIA Las Brujas. |
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Fecha actual : |
06/03/2019 |
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Actualizado : |
20/04/2020 |
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Tipo de producción científica : |
Artículos en Revistas Indexadas Internacionales |
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Circulación / Nivel : |
Internacional - -- |
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Autor : |
PADILLA, F.M.; DE SOUZA, R.; PEÑA-FLEITAS, M.T.; GRASSO, R.; GALLARDO, M.; THOMPSON, R.B. |
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Afiliación : |
FRANCISCO M. PADILLA, Department of Agronomy, University of Almeria, Spain; CIAIMBITAL Research Centre for Mediterranean Intensive Agrosystems and Agrifood Biotechnology, University of Almeria, Spain.; ROMINA DE SOUZA, Department of Agronomy, University of Almeria, Spain.; M. TERESA PEÑA-FLEITAS, Department of Agronomy, University of Almeria, Spain.; RAFAEL GILLSON GRASSO RODRIGUEZ, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; MARISA GALLARDO, Department of Agronomy, University of Almeria, Spain; CIAIMBITAL Research Centre for Mediterranean Intensive Agrosystems and Agrifood Biotechnology, University of Almeria, Spain.; RODNEY B. THOMPSON, Department of Agronomy, University of Almeria, Spain; CIAIMBITAL Research Centre for Mediterranean Intensive Agrosystems and Agrifood Biotechnology, University of Almeria, Spain. |
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Título : |
Influence of time of day on measurement with chlorophyll meters and canopy reflectance sensors of different crop N status. |
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Fecha de publicación : |
2019 |
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Fuente / Imprenta : |
Precision Agriculture, 1 December 2019, Volume 20, Issue 6, Pages 1087-1106. OPEN ACCESS. Doi: https://doi.org/10.1007/s11119-019-09641-1 |
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ISSN : |
1385-2256 |
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DOI : |
10.1007/s11119-019-09641-1 |
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Idioma : |
Inglés |
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Notas : |
Article history: Received 19 June 2019; Accepted 06 February 2020; Published 14 February 2020.
Corresponding author: Padilla, F.M.; Department of Agronomy, University of Almeria, Carretera de Sacramento s/n, La Cañada, Almería, Spain; email:f.padilla@ual.es |
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Contenido : |
ABSTRACT.
Optical sensors are a promising approach for assessing nitrogen (N) status of vegetable crops. However, their potential may be undermined if time of day influences measurements. This study evaluated the effects of time of day and N addition on measurements, made with two chlorophyll meters, SPAD-502 and MC-100, and two active canopy reflectance sensors, GreenSeeker handheld and Crop Circle ACS-470. Three treatments (N1, deficient, N2, conventional, and N3, excessive N application) of N concentration in the nutrient solution were applied by fertigation throughout a sweet pepper crop grown in soil in a greenhouse. Time of day of 12:00 and 15:00 h had an effect on measurements made with the SPAD-502, but only in the N1 treatment, suggesting that the effects of time of day were related to crop N status. This effect was slight, being 1.7 ± 0.02 SPAD units lower at 12:00 and 15:00 h compared to at 9:00 h (relative decrease of 3.6%). For the MC-100, a slight increase in Chlorophyll Content Index (CCI) values of 3.3 ± 0.1 units (relative increase of 6.3%) was observed at 15:00 and 18:00 h, relative to CCI values at 9:00 h, regardless of N treatment. The time of day effect on chlorophyll meters appears to be negligible in relation to the wide range of values measured in greenhouse-grown sweet pepper. Normalized Difference Vegetation Index, measured both with the GreenSeeker and Crop Circle, and Green Normalized Difference Vegetation Index, measured with the Crop Circle, were not affected by time of day in any of the N treatments, showing that these sensors and indices can be used with confidence at any time of the day.
© 2019, The Author(s). MenosABSTRACT.
Optical sensors are a promising approach for assessing nitrogen (N) status of vegetable crops. However, their potential may be undermined if time of day influences measurements. This study evaluated the effects of time of day and N addition on measurements, made with two chlorophyll meters, SPAD-502 and MC-100, and two active canopy reflectance sensors, GreenSeeker handheld and Crop Circle ACS-470. Three treatments (N1, deficient, N2, conventional, and N3, excessive N application) of N concentration in the nutrient solution were applied by fertigation throughout a sweet pepper crop grown in soil in a greenhouse. Time of day of 12:00 and 15:00 h had an effect on measurements made with the SPAD-502, but only in the N1 treatment, suggesting that the effects of time of day were related to crop N status. This effect was slight, being 1.7 ± 0.02 SPAD units lower at 12:00 and 15:00 h compared to at 9:00 h (relative decrease of 3.6%). For the MC-100, a slight increase in Chlorophyll Content Index (CCI) values of 3.3 ± 0.1 units (relative increase of 6.3%) was observed at 15:00 and 18:00 h, relative to CCI values at 9:00 h, regardless of N treatment. The time of day effect on chlorophyll meters appears to be negligible in relation to the wide range of values measured in greenhouse-grown sweet pepper. Normalized Difference Vegetation Index, measured both with the GreenSeeker and Crop Circle, and Green Normalized Difference Vegetation Index, measured with the Crop Circle, wer... Presentar Todo |
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Palabras claves : |
IRRADIANCE; OPTICAL SENSORS; SOLAR RADIATION; SWEET PEPPER; VEGETABLE CROPS; VEGETATION INDICES. |
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Asunto categoría : |
F01 Cultivo |
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URL : |
http://www.ainfo.inia.uy/digital/bitstream/item/12498/1/10.1007-s11119-019-09641-1.pdf
https://link.springer.com/content/pdf/10.1007/s11119-019-09641-1.pdf
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Marc : |
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024 7 $a10.1007/s11119-019-09641-1$2DOI
100 1 $aPADILLA, F.M.
245 $aInfluence of time of day on measurement with chlorophyll meters and canopy reflectance sensors of different crop N status.$h[electronic resource]
260 $c2019
500 $aArticle history: Received 19 June 2019; Accepted 06 February 2020; Published 14 February 2020. Corresponding author: Padilla, F.M.; Department of Agronomy, University of Almeria, Carretera de Sacramento s/n, La Cañada, Almería, Spain; email:f.padilla@ual.es
520 $aABSTRACT. Optical sensors are a promising approach for assessing nitrogen (N) status of vegetable crops. However, their potential may be undermined if time of day influences measurements. This study evaluated the effects of time of day and N addition on measurements, made with two chlorophyll meters, SPAD-502 and MC-100, and two active canopy reflectance sensors, GreenSeeker handheld and Crop Circle ACS-470. Three treatments (N1, deficient, N2, conventional, and N3, excessive N application) of N concentration in the nutrient solution were applied by fertigation throughout a sweet pepper crop grown in soil in a greenhouse. Time of day of 12:00 and 15:00 h had an effect on measurements made with the SPAD-502, but only in the N1 treatment, suggesting that the effects of time of day were related to crop N status. This effect was slight, being 1.7 ± 0.02 SPAD units lower at 12:00 and 15:00 h compared to at 9:00 h (relative decrease of 3.6%). For the MC-100, a slight increase in Chlorophyll Content Index (CCI) values of 3.3 ± 0.1 units (relative increase of 6.3%) was observed at 15:00 and 18:00 h, relative to CCI values at 9:00 h, regardless of N treatment. The time of day effect on chlorophyll meters appears to be negligible in relation to the wide range of values measured in greenhouse-grown sweet pepper. Normalized Difference Vegetation Index, measured both with the GreenSeeker and Crop Circle, and Green Normalized Difference Vegetation Index, measured with the Crop Circle, were not affected by time of day in any of the N treatments, showing that these sensors and indices can be used with confidence at any time of the day. © 2019, The Author(s).
653 $aIRRADIANCE
653 $aOPTICAL SENSORS
653 $aSOLAR RADIATION
653 $aSWEET PEPPER
653 $aVEGETABLE CROPS
653 $aVEGETATION INDICES
700 1 $aDE SOUZA, R.
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700 1 $aGRASSO, R.
700 1 $aGALLARDO, M.
700 1 $aTHOMPSON, R.B.
773 $tPrecision Agriculture, 1 December 2019, Volume 20, Issue 6, Pages 1087-1106. OPEN ACCESS. Doi: https://doi.org/10.1007/s11119-019-09641-1
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