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Proceedings Paper

Fiber optic spectrophotometry monitoring of plant nutrient deficiency under hydroponic culture conditions
Author(s): Oi Wah Liew; William S. L. Boey; Anand Krishna Asundi; Jun-Wei Chen; Duo-Min He
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Paper Abstract

In this paper, fiber optic spectrophotometry (FOSpectr) was adapted to provide early detection of plant nutrient deficiency by measuring leaf spectral reflectance variation resulting from nutrient stress. Leaf reflectance data were obtained form a local vegetable crop, Brassica chinensis var parachinensis (Bailey), grown in nitrate-nitrogen (N)- and calcium (Ca)- deficient hydroponics nutrient solution. FOSpectr analysis showed significant differences in leaf reflectance within the first four days after subjecting plants to nutrient-deficient media. Recovery of the nutrient-stressed plants could also be detected after transferring them back to complete nutrient solution. In contrast to FOSpectr, plant response to nitrogen and calcium deficiency in terms of reduced growth and tissue elemental levels was slower and less pronounced. Thus, this study demonstrated the feasibility of using FOSpectr methodology as a non-destructive alternative to augment current methods of plant nutrient analysis.

Paper Details

Date Published: 7 May 1999
PDF: 5 pages
Proc. SPIE 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99), (7 May 1999); doi: 10.1117/12.347795
Show Author Affiliations
Oi Wah Liew, Singapore Polytechnic (Singapore)
William S. L. Boey, Singapore Polytechnic (Singapore)
Anand Krishna Asundi, Nanyang Technological Univ. (Singapore)
Jun-Wei Chen, Nanyang Technological Univ. (Singapore)
Duo-Min He, Nanjing Univ. of Science and Technology (Singapore)

Published in SPIE Proceedings Vol. 3740:
Optical Engineering for Sensing and Nanotechnology (ICOSN '99)
Ichirou Yamaguchi, Editor(s)

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