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• W2042077170 abstract "- 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." @default.
• W2042077170 created "2016-06-24" @default.
• W2042077170 creator A5025405144 @default.
• W2042077170 creator A5027279189 @default.
• W2042077170 date "2004-01-01" @default.
• W2042077170 modified "2023-09-30" @default.
• W2042077170 title "Distortion of the SPAD 502 chlorophyll meter readings by changes in irradiance and leaf water status" @default.
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• W2042077170 doi "https://doi.org/10.1051/agro:2003060" @default.
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