Distortion of the SPAD 502 chlorophyll meter readings by changes in irradiance and leaf water status

The SPAD 502 Chlorophyll Meter can estimate leaf chlorophyll content as a surrogate measure of the nitrogen (N) status of plants, and therefore, it can be used to assess the N requirements of crops. In this work, we show that irradiance, leaf water status and time of measurement (i.e., morning vs. a...

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Detalles Bibliográficos
Autores principales: Martínez, Dana Ethel, Guiamet, Juan José
Formato: Articulo
Lenguaje:Inglés
Publicado: 2004
Materias:
Ciencias Naturales
Ciencias Agrarias
chlorophyll meter
irradiance
maize
nitrogen
relative water content
SPAD 502
wheat
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/126434
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-126434
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Ciencias Agrarias
chlorophyll meter
irradiance
maize
nitrogen
relative water content
SPAD 502
wheat
spellingShingle Ciencias Naturales
Ciencias Agrarias
chlorophyll meter
irradiance
maize
nitrogen
relative water content
SPAD 502
wheat
Martínez, Dana Ethel
Guiamet, Juan José
Distortion of the SPAD 502 chlorophyll meter readings by changes in irradiance and leaf water status
topic_facet Ciencias Naturales
Ciencias Agrarias
chlorophyll meter
irradiance
maize
nitrogen
relative water content
SPAD 502
wheat
description The SPAD 502 Chlorophyll Meter can estimate leaf chlorophyll content as a surrogate measure of the nitrogen (N) status of plants, and therefore, it can be used to assess the N requirements of crops. In this work, we show that irradiance, leaf water status and time of measurement (i.e., morning vs. afternoon), may interfere with the SPAD 502 measurements. SPAD values increased by 2-3 units as relative leaf water content decreased from 94 to 87.5% 57492768n wheat leaves. A change in irradiance (from 1100 to 600-650 mmol m⁻² s⁻¹) caused an increase of about 2 SPAD units in potted maize plants. Throughout the day, SPAD values varied by up to 4 units in well-watered plants of maize growing under field conditions. The slope of the response of the SPAD meter to chlorophyll content was steeper in the morning than in the afternoon. Since the range of SPAD values that may separate N deficiency from N surplus in a crop are often relatively narrow, time of measurement, irradiance and plant water status must be taken into account to precisely monitor crop N needs with the SPAD 502.
format Articulo
Articulo
author Martínez, Dana Ethel
Guiamet, Juan José
author_facet Martínez, Dana Ethel
Guiamet, Juan José
author_sort Martínez, Dana Ethel
title Distortion of the SPAD 502 chlorophyll meter readings by changes in irradiance and leaf water status
title_short Distortion of the SPAD 502 chlorophyll meter readings by changes in irradiance and leaf water status
title_full Distortion of the SPAD 502 chlorophyll meter readings by changes in irradiance and leaf water status
title_fullStr Distortion of the SPAD 502 chlorophyll meter readings by changes in irradiance and leaf water status
title_full_unstemmed Distortion of the SPAD 502 chlorophyll meter readings by changes in irradiance and leaf water status
title_sort distortion of the spad 502 chlorophyll meter readings by changes in irradiance and leaf water status
publishDate 2004
url http://sedici.unlp.edu.ar/handle/10915/126434
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