Vol 9 No 3-4 (2003)
Cikkek

Illumination-Independent Reflectance Information Acquirement for Leaf Water Potential Measurement on the Example of Satsuma Mandarin

Published October 20, 2003
J. Kriston-Vizi
Szent István University, Faculty of Horticulture Science, Technical Department, H-1118 Budapest, Villányi út 29-43., Hungary
M. Umeda
Division of Environmental Science and Technology, Graduate School of Agriculture, Kyoto University, Sakyo-ku Kyoto, 606-8502, Japan
K. Miyamoto
Wakayama Research Center of Agriculture, Forestry and Fisheries, 751-1 Oki, Kihi-cho, Arida-gun Wakayama, 643-0022, Japan
A. Ferenczy
Szent István University, Faculty of Horticulture Science, Department of Mathematics and Informatics, H-1118 Budapest, Villányi út 29-43., Hungary
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How to Cite

APA

Kriston-Vizi, J., Umeda, M., Miyamoto, K., & Ferenczy, A. (2003). Illumination-Independent Reflectance Information Acquirement for Leaf Water Potential Measurement on the Example of Satsuma Mandarin. International Journal of Horticultural Science, 9(3-4), 75-79. https://doi.org/10.31421/IJHS/9/3-4/409

Abstract

Mandarin fruit sugar content can be increased when subjecting the satsuma mandarin tree (Citrus unshiu MARC. var. satsuma) to moderate water stress by mulching during the period of active sugar accumulation, thereby fruit quality improvement can be realized. In the frame of the precision agriculture production system, a non-destructive measuring method development became necessary based on remote sensing, field spectroscopy and image analysis, to be able to measure the degree of water stress. Large amount of visual information have been recorded at ground level, in near infrared, red and green channels by a false color digital camcorder designed specially for remote sensing applications. A method have been found to be able to calculate the absolute reflection of mandarin leaf surface by comparing leaf reflectance with known reference target reflectance, thereby established the basis of further studies in this topic. Leaf absolute reflection can be measured reliably, under variable natural illumination at field conditions. Functional correlation can be searched between visual information and leaf water potential measured by PMS pressure chamber.

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