Oba is a leafy green vegetable dish in Japan. Which is popular in more consumers. The demand leaves Oba even more. The price of the 0.5 to 1 baht, depending on the season. The winters are long and short days. Oba leaf prices will rise. Since the beginning of flowering Oba Oba leaves yields lower. The price rise Solutions achieved by the Oba planted in greenhouses. Together with the use of light to enhance the long day. The plants in greenhouses are used to grow the plant material in the water and nutrients in a nutrient solution. Because of the ease of operation, rather than growing in soil. So it has conducted experiments to investigate the effect of the concentration of the nutrient solution formula Enshi on growth and yield of the Oba. The seeds Oba leaves cultured seedlings until the age of one month. And then seedlings planted in coconut planting materials. the house Then the nutrient solution formula Enshi concentrated 5 different levels: 1.2, 1.8, 2.4, 3.0 and 3.6 mS / cm, respectively, showed that concentrations of 2.4, 3.0 and 3.6 mS / cm to the height of the most significant way. statistics concentrations 1.8 and 2.4 mS / cm width canopy most significant statistically. The concentrations of 2.4 and 3.0 mS / cm to yield (the number of tickets) most significant statistically. But the concentration of the growth rate of the broad leaves Oba per day did not differ statistically.
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