The effects of various levels of copper on the initiation and development of flower buds in two cuhivars of Chrysanthemum morifolium grown in solution culture have been examined. Plants were harvested at regular intervals during a short-day photoperiod, and buds scored according to an arbitrary 22-stage scale of flower development. A critical level of copper has been determined below which flower bud initiation is much retarded.
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Graves et al. (1974) studied this question.
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