ISHS Acta Horticulturae 483: International Symposium on Vegetable Quality of Fresh and Fermented Vegetables
THE EFFECT OF A CONTROLLED SUPPLY OF NUTRIENT SOLUTION ON FRUIT QUALITY OF TOMATOES GROWN IN A ROCKWOOL CULTURE SYSTEM |
| Authors: | C. Jeong, K. Yoo, Y. Song, H. Lim |
| Keywords: | Soluble solids, nutrient solution, tomato, sugars, organic acids, NO3 |
| Abstract:
In tomato fruits grown under a daily supply of a 1.4 liter nutrient solution in a rockwool culture system, soluble solids contents (SSC) were higher in 'Momotaro' than in 'Kangyuck' type tomatoes. But, for both cultivars, SSC contents were 1.0 to 1.4% higher in fruits cultivated under a limited supply (0.8 liter) of nutrient solution than those grown under normal supply (1.4 liter) conditions. Sugars that accumulated in the fruits were mostly glucose and fructose with trace amounts of sucrose. Sugar contents in fruits grown under the normal conditions increased gradually, but rapid increases were detected in those grown under the 0.8 liter nutrient supply system. Among the organic acids seen in fruits grown under normal solution nutrient supply system, malic acid levels were about 2% for both cultivars, but in fruits grown under the limited nutrient supply system, 2.5 and 3.0% levels of malic acid were found in 'Momotaro' and 'Kangyuck', respectively. Total organic acid contents in tomatoes grown under the 0.8 liter supply system were much higher (1–1.5%) in both cultivars than those grown under the normal supply system. Lower levels of NO3 were maintained in fruits grown under the limited nutrient solution of 0.8 liter as compared to fruits harvested from the 1.4 liter supply system. Total fruit yield was the highest (683.8 g) at the fourth fruit clusters (FC) of 'Kangyuck' in the 1.4 liter system, and the yield was 565.5 g at the second FC in the 0.8 liter supply system. | |
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