Abstract
This work reports research on effects of light intensity, fertilizers, and Organozyma® (a natural bioregulator compound) on the growth and floral quality of potted calla lily cv. Green Goddess [Zantedeschia aethiopica (L) K, Spreng] growing in a tropical upland. The highest number of leaves (6.4) was produced under 35% shade using polypropylene material and soil application of fertilizer N P K Mg 12-11-18-3. The treatment with fewest leaves (2.4) was obtained by applying to the soil N K 14-40 for plants in full sun.The plant length (50.4 cm), floral peduncle length (73.1 cm), spathe width (13.8 cm) and spadice length (5.5 cm) were significantly greater (P < 0.05) in plants 50% shaded than in those exposed to full sun. The largest leaf area (508 cm2) was recorded in plants under 50% shade treated with applications of N P K Mg 12-11-18-3 (soil), and N P K 20-30-10 + Organozyma® (foliar). The plants producing the most individual shoots per pot (5.0) were also treated with 12-11-18-3 + 20-30-10 + Organozyma® irrespective of the light treatments. In another experiment, tubers of 'Cameo' [Z. albomaculata (Hook) Bail] were dipped in Organozyma®. These tubers produced an average 5.6 shoots; the controls, only 4.4.