Evaluation of nutritional status of hydroponically grown tomato by leaf and nutrient solution analyses
2002
Pokluda, R. | Petrikova, K. (Mendel Univ. of Agriculture and Forestry, Brno (Czech Republic))
Quality control of a nutrient solution is one of the possibilities of determining the plant nutritional status in hydroponics. Experiments were carried out to evaluate nutrient solution analysis and tomato leaf diagnostics as tools for nutritional management. Samples of the nutrient solution were taken from the tomato root area in rockwool and leaves 4th and 5th from the top of a plant were used as leaf samples. Results showed that the nutrient dynamics variability of the solution is more than twice as high as in leaf samples. Leaf diagnostics provides much more precise evaluation of the plant status with most nutrients (N, P, K, Ca, Mg, Na), compared to nutrient solution analysis. The variability in Fe and Cu contents was very high in both sample types. The following optimum nutrient concentrations were detected in tomato leaf (% dry matter (DM) during full harvest period: 2-3% NTOTAL, 0.4-1% P, 3-4% K, 2-3% Ca, 0.4-0.6% Mg, and 0.3% Na. The contents of trace elements Fe, Mn, Cu and Zn were 150-200, 30-60, 10-30 and 25-50 mg/kg DM, respectively
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