FACTORS INFLUENCING THE RESPONSE TO PHOTOPERIOD (LD TREATMENT) DURING THE WINTER IN AN AUTUMN-PLANTED CARNATION CROP

ISHS Acta Horticulturae 216: III International Symposium on Carnation Culture

FACTORS INFLUENCING THE RESPONSE TO PHOTOPERIOD (LD TREATMENT) DURING THE WINTER IN AN AUTUMN-PLANTED CARNATION CROP

Authors:

L.D. Sparnaaij, J.F. Demmink, H.J.J. Koehorst-van Putten

Abstract:
In an autumn-planted crop, varietal differences in response to LD treatments are analysed. Long days (24 hours per day) are given for 2 or 3 weeks in December and/or January. Average flowering date of the first flush is used as the main parameter. LD does not induce flowering in all shoots. LD effect may be better expressed as percentage shoots induced to early flowering.

Reaction of individual shoots appears to depend on:

position of the shoot on the main stem
number of leaf pairs of the shoot at the start of the LD treatment
speed of development of the shoot (in terms of leaf pairs unfolded per unit of time)

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