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Rapid Nutrient Diagnosis of Tomato by Test Strips and a Chlorophyll Meter  

Kim, Kwon-Rae (Department of Environmental Horticulture, The University of Seoul)
Jeoung, Han-Ul (Department of Environmental Horticulture, The University of Seoul)
Kim, Kye-Hoon (Department of Environmental Horticulture, The University of Seoul)
Publication Information
Applied Biological Chemistry / v.46, no.2, 2003 , pp. 140-143 More about this Journal
Abstract
This study was performed to develop a more rapid and simple nutrient diagnosis method of plants than the conventional leaf analysis method. tomato (Lycopersicon esculentum Mill. cv. super momotaro) was planted in the mixed media produced by mixing perlite and rock wool at 1 . 1 (v/v) ratio. The Yamazakki nutrient solutions for cucumber and tomato were supplied to the media using the micro-drip irrigation system. Experimental plots produced consisted of no fertilization, deficient fertilization, adequate fertilization and surplus fertilization for N, P and K, respectively. Each experimental plot was replicated four times. Specific color different sensor values (SCDSV) measured by the chlorophyll meter were closely related to total-N concentrations in the leaves measured by the conventional method. Nitrate, $PO_4$ and K concentrations in petiole sap measured by test strips #(Reflectoquant^{\circledR},\;Merck,\;Germany)$ showed a significant relationship with total-N, p and K concentrations in leaves. The linear regression equations between $NO_3,\;PO_4$ and K concentrations in petiole sap and total-N, p and K concentrations in the leaves were prepared. The optimum levels of $NO_3,\;PO_4$ and K in petiole sap were obtained by plugging the optimum concentrations of total-N, p and K in the leaves by other researchers into the equations. In conclusion, the SCDSV by the chlorophyll meter and concentrations of NO3, p and K in petiole sap measured by the test strips would be suitable for rapid estimation of plant nutrient status.
Keywords
nutrient diagnosis; tomato (Lycopersicon esculentum Mill.); test strip; chlorophyll meter;
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