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The influence of temperature and water potential on rooting of poinsettia cuttings (Euphorbia pulcherrima L. 'Lady')

, : The influence of temperature and water potential on rooting of poinsettia cuttings (Euphorbia pulcherrima L. 'Lady'). Acta Horticulturae (54): 127-136

The results are presented of rooting trials with poinsettia cuttings inserted in blocks of Grodan (rockwool), Jiffy-7 and Jiffy-9 (both peat-based). The water retention curves and O2 diffusion rates were determined for the 3 types of block. Rooting was inhibited when the blocks were subjected to nil tension (0 cm) at which the respective air contents of the 3 block types were 2.7, 1.7 and 3.2% by volume. As the tension rose to 8 cm the rooting percentage increased.

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