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

Effects of macroelement concentrations on growth, flowering, and nutrient a bsorption in mericlone seedlings of an Odontoglossum hybrid (Odontioda Love ly Morning 'Sayaka') were studied in sphagnum moss culture. Concentrations of N, P, and K in irrigation were varied independently between 0 and 2 time s control. Leaf number and area varied little, but leaf color became pale w ith declining N level. Bulb diameter became smaller with lower N levels. Th e 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 f lowers, and advanced flowering date. Flowers became narrow with low K level s. (C) 1999 Elsevier Science B.V. All rights reserved.