Growth and Photosynthesis of Single-Stemmed Roses as Affected by Macro- and Micro-Element Amendment in a Closed Aeroponic System

서지정보

· 발행기관 : 한국원예학회
· 수록지 정보 : 원예과학기술지 / 27권 / 3호 / 404 ~ 413페이지
· 저자명 : 여경환, 이용범

초록

The effect of mineral nutritional control on the growth and photosynthesis of single-stemmed roses ‘Red Velvet’ and ‘Vital’ was examined in order to find a method of controlling inorganic ions properly. Levels of inorganic ions in a closed aeroponic system were adjusted by changing electrical conductivity (EC treatment), concentrations of N, P and K (NPK treatment), macro-elements (M treatment), and macro- and micro-elements (MM treatment) and by supplementing a nutrient solution of 1.5 dS･m-1 (S treatment). The photosynthetic rate, stomatal conductance and transpiration rate for ‘Vital’ were high in the S treatment, but low in the EC and NPK treatments. In ‘Red Velvet’ these were the greatest in the MM treatment, and showed a tendency of being low in the EC and S treatments. Both cultivars showed lower Fo and higher Fm and Fv/Fo values in the M and MM treatments than in the EC, S and NPK treatments, with a Fv/Fm value reaching to approximately 0.8, the yield value of plants grown under a normal environment. The quantum yield decreased in all treatments with increasing light intensity. For ‘Red Velvet’, the quantum yield value was the least in the EC control treatment, with values smaller than 0.1 at a light intensity of 1,200 μmol･m-2･s-1 and the greatest in the MM control treatment. To determine the effect of these treatments on the growth of single-node cuttings, length of cut flowers, stem diameter, fresh and dry weight, flower height, and flower width were measured. Length of cut flowers was the longest in the M and MM treatment for both cultivars. Fresh weight was the heaviest in the MM treatment and the lightest in the EC treatment in both cultivars. Both cultivars showed the greatest anthocyanin content in the petal in the M treatment, with the greatest chlorophyll content, and the least in the petal in the NPK treatment, but no significant differences were observed among the EC, S and NPK treatments.

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