A plant based sensing method for nutrition stress monitoring |
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Authors: | Dariusz Tomkiewicz Tomasz Piskier |
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Institution: | (1) Division of Control Engineering, Koszalin University of Technology, ul. Raclawicka 15, 75-620 Koszalin, Poland;(2) Division of Agricultural Engineering, Koszalin University of Technology, ul. Raclawicka 15, 75-620 Koszalin, Poland |
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Abstract: | Due to economical and ecological reasons it is important to provide the necessary flexibility in fertilizer management to
respond to differences in plant nutrients requirements. Plant-based sensors have potential to provide more accurate and on-line
information regarding crop bio-responses to environmental stress and could overcome limitations of traditional methods which
focus only on monitoring parameters of soil. Current research regarding on-line plant stress sensing techniques concentrates
on spectroscopic and image processing methods. These techniques have many limitations connected with their sensitivity to
environmental interferences. In recent years, impedance spectroscopy has become a well-known non-invasive tool for describing
the electrical properties of many systems. The research hypothesis tested was that information provided by Electrical Impedance
Spectroscopy is correlated with tomato plant stress caused by lack of mineral nutrients in the growth medium. The experiment
was conducted with two sets of hydroponically-grown tomato plants (Lycopersicon esculentum Mill., cv. ‘Maliniak’). During
the experiment the tomato plants were fed alternately with flow of necessary nutrients and with distilled water. The impedance
spectra were measured by scanning frequencies from 100 Hz to 50 kHz to determine the most sensitive frequency. A Nutrition
Index was proposed for indicating variability of mineral nutrition within plants, and its correlation with experimental plant
data was tested. Data showed that the relation between the Nutrition Index and the stress caused by lack of mineral nutrients
in the growing medium was a monotonic function in the case of study. The results presented in the paper support the concept
that the electrical impedance spectroscopy is a non-destructive, economical and reliable measurement method, which can be
utilised for plant nutrition stress monitoring. |
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