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Composition of tomatoes and tomato products in antioxidants (WG1) page 46
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Table 20. Vitamin C concentration (mg/kg) and Calcium concentration (mg/kg) in
tomato fruit obtained in two different growing environments (rough values estimated
from a graph) (after Premuzic et al, 1998)
Growing environment Vitamin C concentration Calcium concentration
Hydroponic 60 100
Organic 150 500
Effect of combined Nitrogen-Phosphorus-Potassium...
In several papers it has been reported that fruit vitamin C content could increase with
the supply of combined fertilizers. Sharma and Mann (1971) obtained about 10% significant
increase in ascorbic acid content of tomato juice, from about 20 to 22 or from about 21 to 23
mg/100 ml juice according to the season (not significant in tomato fruit) for N fertilization
increase (50 to 150 kg/ha) combined with phosphorus or P2O5 fertilization increase (30 to 90
kg/ha) combined with nitrogen respectively in open field (Table 21). However, when the
ascorbic acid content was expressed in relation to total soluble solids, P effect seemed to
result in an increase but N effect did not.