Table 4. Approximate Threshold Light Values for the Suppression or Induction of Floral Initiation in Some Long- and Short-Day Plants. Adapted from (9). Chrysanthemum morifolium Kalanchoe blossfeldiana Euphorbia pulcherrima (poinsettia) Pharbitis nil Cannabis sativa cv Kentucky Glycine max Xanthium strumarium Brassica campestris Lolium temulentum cv Ceres Silene armeria Hordeum vulgare Callistephus chinensis
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