Abstract
Tomato plants (Lycopersicon. esculentum Mill cv. Momotaro) were cultured in nutrient solutions of varying concentrations or of varying nitrate (NO3) levels. The leaf blades and the main petioles including rachis were collected from the mixture of three successive leaves below each fruit truss at two growth stages. Comparisons were made between the nutrient concentration in the leaf blade and the petiole determined by plant sap analysis, and that in the leaf blade determined by the dry ashing method. Closely correlated relationships were found to exist between the phosphorus (P), calcium (Ca), and magnesium (Mg) concentrations in the leaf blade and the petiole determined by plant sap analysis, and those in the leaf blade determined by the dry ashing method at two growth stages. For the concentration of potassium (K), there was no correlation between results of plant sap analysis and those determined by the dry ashing method at either growth stage.
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