Resumo

CHICA TORO, Fáber de Jesús  e  CORREA LONDONO, Guillermo Antonio. EVALUATION OF TWO PHOTOPERIOD TREATMENTS IN CHRYSANTHEMUM (Dendranthema grandiflorum ((Ramat.) Kitam.), UNDER CONDITIONS OF HIGH ANDEAN INTERTROPIC. Rev. Fac. Nac. Agron. Medellín [online]. 2005, vol.58, n.2, pp.2859-2882. ISSN 0304-2847.

In Colombian floriculture, nearly 14% of the production costs of chrysanthemum (Dendranthema grandiflorum (Ramat.) Kitam.) consists of the additional lighting required to control its flowering.  In order to find a protocol that consumes a lower amount of electricity, this study compared the effects of two supplementary noctural lighting schemes on several preharvest and postharvest characteristics in two commercial varieties of chrysanthemum: Super White and Super Yellow.  The control nocturnal lighting scheme consisted of providing the supplemental lighting during 28 days for the Super Yellow variety and during 26 days for the Super White variety. The alternative nocturnal lighting scheme consisted of interrupting the stimulus during one complete night every two days.  This approximately 30% reduction in light stimulation did not affect either growth or postharvest characteristics of the varieties evaluated.

Palavras-chave : Photoperiod; Dendranthema grandiflorum; chrysanthemum.

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