Composition and EC of Nutrient Solution on Growth and Quality of Carrot (Daucus carrota L.) in Hydroponics
2017
Oh, D.G., Jeju National University, Jeju, Republic of Korea | Cha, M.K., Jeju National University, Jeju, Republic of Korea | Cho, Y.Y., Jeju National University, Jeju, Republic of Korea
Carrot leaves have many nutrients as well as roots, which will increase the demand for carrot leaves in the future. This study was carried out by dividing into two stages: high temperature and low temperature periods, in order to investigate the possibility of cultivation of carrot leaves and the composition and EC of the nutrient solution for growth and quality of carrot leaves. Composition of nutrient solution(NO3-N: 16.0, NH4-N: 1.0, P: 1.0, K: 11.0, Ca: 2.0, Mg: 1.0, SO4-S: 1.0 mMㆍL-¹) developed by analysis of plant. In the high temperature range (From June 29th to Sep. 8th, 2016), the concentration of the developed nutrient solution (JNU) were 1.0, 2.0, 3.0, and 4.0 dSㆍm-¹ and the concentration of nutrient solution of Japanese Horticultural Station(JHS) 2.0 dSㆍm-¹ was used for comparison. In the low temperature range (From Dec. 31st, 2015 to Feb. 29th, 2016), the concentration of the developed nutrient solution 1.0, 2.0, and 3.0 dSㆍm-¹ were used. Growth was investigated in root fresh and dry weights, shoot fresh and dry weights, leaf number, and leaf area of carrot. In the high temperature range, the leaf area and shoot fresh and dry weights were good at 1.0 and 2.0 dSㆍm-¹. The sugar content of the root was the highest at the EC 2.0 dSㆍm-¹, and the chlorophyll content was the highest at the EC 4.0 dSㆍm-¹. In the low temperature range, The shoot fresh and dry weights were the highest at EC 1.0 and 2.0 dSㆍm-¹. There was no significant difference in sugar content and chlorophyll content. As a result, from the viewpoint of growth and quality of carrot, it is good to cultivate EC 1.0 and 2.0 dSㆍm-¹ in high temperature period and low temperature period, but EC 1.0 dSㆍm-¹ is economical perspective such as fertilizer input.
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