Determining the Influence of Water Deficiency on NPK Stress Discrimination in Maize using Spectral and Spatial Information |
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Authors: | Email author" target="_blank">Lene?K?ChristensenEmail author Shrinivasa?K?Upadhyaya Bernie?Jahn David?C?Slaughter Eunice?Tan David?Hills |
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Institution: | (1) Nordic Gene Bank, P.O. Box 41, SE-230 53 Alnarp, Sweden;(2) Department of Biological and Agricultural Engineering, University of California, One Shields Ave, Davis, CA 95616, USA |
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Abstract: | A necessary pre-requisite for variable rate application of plant nutrients to manage inputs in a site-specific manner is a
technique to detect nutrient stresses in plants in real-time. Spectral reflectance of plant canopy may provide a non-destructive
and rapid technique to detect nutrient and water stress in plants. In this study, we investigated the effect of water on nutrient
stress discrimination (nitrogen, N; phosphorus, P; and potassium, K) based on the visible and near infrared reflectance of
maize leaves grown under controlled greenhouse conditions. The analysis of the spectral data indicated that it was challenging
to detect the nutrient deficiencies if the plant water status was unknown. However, if a priori knowledge of water stress
existed, such as a well-watered situation, the ability to discriminate nutrient stress improved significantly. The analysis
of whole plant behaviour (i.e., mean reflectance data from all leaves within a plant) versus leaves located at a specific
location within a plant indicated that knowledge of spatial location of leaves within a plant helped to identify N and P stress
and NPK as a multi-stress condition more clearly. |
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Keywords: | nutrient deficiency water stress spectral reflectance NPK discrimination |
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