ISSN : 1225-5009(Print)
ISSN : 2287-772X(Online)
Effects of Various Nutrient Solutions on Plant Growth of Cymbidium ‘Lovely Smile’ and ‘Aria’
Cymbidium is one of the most popular and economically important species cultivated as a commercial ornamental crop. The objectives of this study were to determine the appropriate nutrient solution treatment that improves plant growth for the best spike characteristics. Two-year-old Cymbidium ‘Lovely Smile’ and ‘Aria’ plants (P2) were transported to an environmentally controlled Information and Communication Technology (ICT) smart greenhouse at Seoul Women’s University from a commercial greenhouse in Gongju (17 May 2022). Treatments were changed with two kinds of nutrient solutions like High N (Peters fertilizer, 20N-20P-20K) and High K&Ca (S-feed Ca, 13-7-21 + 8CaO) during shoot development spike elongation, and flowering. Treatments were N1 (High N→High N→High N), N2 (High N→High N→High K&Ca), N3 (High N→High K&Ca→High N), and N4 (High N→High K&Ca→High K&Ca). The EC of the nutrient solution was maintained at 1 dS·m1 and the pH was adjusted to 6.0 - 6.5. The leaf length, leaf width, leaf number, pseudobulb number, and pseudobulb diameter (B1, first pseudobulb; B2, second pseudobulb; B3, third pseudobulb; B4, fourth pseudobulb) were investigated 34 weeks after nutrient supply. Cymbidium ‘Lovely Smile’ showed no significant difference in leaf length, leaf width, and leaf number with the nutrient treatments. The highest value of pseudobulb number appeared in plants treated with N3. Pseudobulb diameters of the first and second pseudobulb (P2B1 and P2B2) showed no significant difference according to the nutrient treatments. Leaf width and leaf number of Cymbidium ‘Aria’ showed no significant difference among the nutrient treatments. Leaf width increased in plants of treatment N1 and N4, and pseudobulb number showed the highest values in plants of treatment N3. Pseudobulb diameter was significantly different in the first pseudobulb (P2B1) according to the nutrient treatments, and plants of treatment of N1 and N4 showed the highest values of pseudobulb diameter. Pseudobulb diameter of the second, third and fourth pseudobulb (P2B2, P2B3, and P2B4) showed no significant difference with the nutrient treatments. Plants of treatment N2 and N3 produced four pseudobulbs, and N1 and N4 formed three pseudobulbs. Treatment N3 was recommended for higher pseudobulb production in Cymbidium ‘Lovely Smile’ and ‘Aria’ plants.