Influence of Irrigation Levels on Plant Growth and Fruit Quality in Lycopersicon esculentum Mill
2009
Kang, N.J., Protected Horticulture Experiment Station, National Institute of Horticultural and Herbal Science, Busan, Republic of Korea | Choi, Y.H., Namhae Sub-Station, National Institute of Horticultural and Herbal Science, RDA, Namhae, Republic of Korea
Influence of irrigation levels by different soil moisture-based water potentials on plant growth and fruit quality in fresh tomato were investigated. Amount of irrigation was saved about 11.5, 30.4 and 49.3% at -20, -25 and -30 kPa treatment compared to the -15 kPa treatment, respectively. The total dry weight in 'Superdotaerang' cultivar was significantly reduced by 4.8, 21.2 and 34.0% in -20, -25 and -30 kPa treated plants compared to the -15 kPa treated plants, respectively. However, differential patterns of total dry weight did not occur in 'Rapito' cultivar by reduction of irrigation amount. Although fruit weight in 'Superdotaerang' cultivar was reduced by 20.9% at -30 kPa treatment compared to the -15 kPa treatment, total soluble solids was significantly increased by 27.8% at 7.13 °Brix compared with 5.58 °Brix in the fruit of -15 kPa treated plants. However, fruit weight and total soluble solids in 'Rapito' cultivar did not differ by reduction of irrigation amount. In Superdotaerang cultivar, content of glucose and fructose in fruit of -30 kPa treated plants was higher at 70.6% and 53.5% than those in fruit of -15 kPa treated plants, respectively. The contents of glucose and fructose in the fruit of 'Rapito' cultivar increased by 17.6% and 14.4% in the fruit of -30 kPa treated plants compared with 14.47 mg and 13.45 mg per g fresh weight of fruit of -15 kPa treated plants, respectively. The content of citric acid and malic acid in 'Superdotaerang' cultivar were increased to 62.4% and 34.5% by -30 kPa treatment compared with 3.22 mg and 0.776 mg per g fresh weight of fruit of -15 kPa treated plants, respectively. However, content of citric acid and malic acid by reduction of irrigation amount did not differ in 'Rapito' cultivar.
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