ISHS Acta Horticulturae 673: IX International Symposium on Flower Bulbs
EFFECTS OF NUTRIENT SOLUTION COMPOSITION AND PLANT GROWTH RETARDANTS ON GROWTH AND FLOWERING IN HYDROPONICS OF CUT TULIP |
| Authors: | K.H. Lee, J.-K. Suh |
| Keywords: | hydroponic, nutrient solution, paclobutrazol, uniconazole, tulip |
| Abstract:
The effects of nutrient solution composition and plant growth retardants on tulip growth and flowering were studied using hydroponics. Plants were grown with 10.7, 14.3 or 17.9 meq/L N, each with 3.9 meq/L K. The fourth treatment consisted of 12.1 and 5.1 meq/L N and K, respectively. Two plant growth regulators, paclobutrazole and uniconazole, were also studied by bulb injection. For ‘Ile de France’, days to flowering was accelerated by nitrogen levels above 14.3 meq/L as compared to lower levels and the length of the first internode was slightly increased by nitrogen levels above 12.1 meq/L. Flowering time of the cultivar ‘Golden Apeldoorn’, responded in the same manner, that is, higher nitrogen concentrations accelerated flowering. In ‘Golden Apeldoorn’, the lengths of the first, second and third internodes were not significantly affected by nutrient composition. But, the length of the last internode, total stem length and tepal length were decreased by the highest nitrogen level. In ‘Ile de France’, the length of the first and total internodes was somewhat retarded by uniconazole treatments as compared to non-treated controls. For ‘Golden Apeldoorn’, regardless of plant growth retardant, days to flowering was accelerated by 17.9:3.9 meq/L N:K treatment. Generally, the lengths of the first, second, third and last internodes were decreased by uniconazole treatments, but flower size (tepal length) was not affected. | |
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