Effects of Electrical Conductivity of Nutrient Solution on Growth and Flower Quality of Tulip Grown in Hydroponics System
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Abstract
Nutrient concentrations in term of electrical conductivity value is one of the important factors that affected the growth and quality of tulips grown in hydroponics. The optimum concentration brought about good quality of flowers. However, the research on nutrient levels for the growth and quality of tulips in Thailand was rarely reported. Therefore, this study was aimed to determine the effect of plant nutrient concentrations in the culture solution on the growth and flowering of tulip ‘Orange Juice’. Tulip bulbs with an average of 12 cm circumference were grown in a hydroponics system using double pots system under a plant factory with an average temperature of 20 ± 2 ºC, average light intensity 442 µmol m-2s-1 and 80 - 90 % RH. The experimental design was completely randomized design (CRD) with 5 treatments and 4 replications. Plants were supplied with five different electrical conductivity (EC) levels i.e., 0, 1.0, 1.5, 2.0 and 2.5 dS/m Plant growth, photosynthesis rate, flowers and new bulbs quality were measured. The results showed that there were not significantly different between treatments on days to flowering and stalk diameter parameters. Plants supplied with EC levels at 0, 1.0 and 1.5 dS/m, photosynthesis rate and transpiration rate were not significant. However, plants height, stalk length, total fresh weight, photosynthesis rate and transpiration rate were decreased when the plant was supplied with high EC levels at 2.0 and 2.5 dS/m but bulb fresh weight, bulb circumference and number of new bulbs per plant were not significant between treatments. Plants supplied with 0 dS/m of nutrient solution showed 66.6 % of stem topple characteristics, while plants supplied with 2.5 dS/m showed 22.2 % of flower abortion.
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