• Horticultural Science & Technology
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• v.19 no.4
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• pp.495-500
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• 2001

Seed germination, seedling growth, plant establishment after transplanting, set of female flowers, and subsequent fruit growth were examined in cucumbers grown in soils having varying electrical conductivities (EC) of $1.0-5.0dS{\cdot}m^{-1}$ adjusted by adding different amount of a commercial compound fertilizer (N : $P_2O_5$ : $K_2O$ = 21 : 17 : 17). Slower seed germination was recorded in soils having EC value of $3.0dS{\cdot}m^{-1}$ or higher and little or no germination took place in soils with EC $4.0dS{\cdot}m^{-1}$ until 8 days after sowing. Suppression of seedling growth was apparent in soils having EC level of $2.5dS{\cdot}m^{-1}$. All seedlings died eventually at EC level of $3.5dS{\cdot}m^{-1}$. Leaf color became progressively dark green with the increase in EC from 1.0 to $3.0dS{\cdot}m^{-1}$. The first female flower was formed at higher node and the number of days required for the first flowering of female flower increased with the increase in EC values up to $3.0dS{\cdot}m^{-1}$. Occasionally, leaf yellowing and self-topping symptoms appeared in plants grown in soils having EC level of $3.0dS{\cdot}m^{-1}$.

• Horticultural Science & Technology
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• v.17 no.6
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• pp.737-741
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• 1999

We surveyed the physiological disorders of fruit vegetables grown in the greenhouse in Kyungbuk province in 1998. Greenhouses used for cultivation were mostly single or multi-span iron pipe houses covered with polyethylene film. Single span greenhouses were used for strawberry, oriental melon and watermelon. Fifty six percent of the surveyed farms was a mono-cropping system for oriental melon and tomato. There were greenhouses used for successive cultivation for 10 years or more for strawberry and oriental melon in Koryeong and Seongju. Varieties of fruit vegetables cultivated were diverse, especially in cucumber and watermelon. In strawberry, malformed fruits were observed most frequently in March and the small fruits at late harvest period. Leaf chlorosis, stunt plants and runner outbreak were also found during the growing season. In tomato, occurrence of malformed fruits was severe from March to May, and occurrence of cracked fruits and blossom- end rot was also severe in October and November. The self topping and abnormal stem in tomato were problem in hydroponic cultures in August and November, respectively. Malformed cucumber fruits, such as curved, club shaped, irregular shaped and narrow necked, occurred at late season. Umbrella-shaped leaf in cucumber in summer were caused by calcium deficiency. Most serious disorders were fermented and malformed fruits occurring from March to May in oriental melon, and cracked fruits occurring from April to May in watermelon. At late growing stage of melons the leaf chlorosis occurred with complex symptoms of leaf disease. Growers had little knowledge on physiological disorders, and also on diagnose and measures to cure the disorders. Most growers pointed out that poor soil environment and temperature management in the greenhouse as the main causes of physiological disorders.