Effects of macroelement concentrations on growth, flowering, and nutrient absorption in an Odontoglossum hybrid

Effects of macroelement concentrations on growth, flowering, and nutrient absorption in mericlone seedlings of an Odontoglossum hybrid (Odontioda Lovely Morning ‘Sayaka') were studied in sphagnum moss culture. Concentrations of N, P, and K in irrigation were varied independently between 0 and 2 times control. Leaf number and area varied little, but leaf color became pale with declining N level. Bulb diameter became smaller with lower N levels. The number of roots also smaller in low N levels. Root length shortened at 0 N and P. Lower N levels also resulted in shorter and thinner stalk, fewer flowers, and advanced flowering date. Flowers became narrow with low K levels.