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  • Author or Editor: B. Hanger x
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Miniature flowering potted Hydrangea macrophylla Thunb. cv. Merritt's Supreme plants (multistem, 15 to 20 cm tall) were grown in a modified hydroponic system. High-quality plants were produced by pulsing plants with paclobutrazol (0.2 mg·liter-1) for 4 weeks. Flower initiation was advanced in the terminal buds of treated plants by 12 days, and this earlier flower development was maintained through to flower maturity, without loss of inflorescence diameter. Chemical name used: β -[(4-chlorophenyl) methyl] -α-(1,1-dimethylethyl)-1 H -1,2,4-triazole-1-ethanol (paclobutrazol, ICI-PP333).

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Intact 3-month-old seedlings of apple (Malus domestica Borkh.) were grown for up to 32 days in either a complete nutrient solution, a Ca-free nutrient solution or demineralized water. Over this period, both of the Ca-free solutions removed Ca previously deposited in the root. The presence of cations in the external media caused much of the root Ca to be leached into the surrounding media, whereas in the absence of these cations most of the root Ca moved into the shoot.

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