บทคัดย่องานวิจัย

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Production factors affect the postproduction performance of poinsettia - a review.

Nell, T. A.; Leonard, R. T.; Barrett, J. E.;

Acta Horticulturae Year: 1995 Issue: No. 405 Pages: 132-137 Ref: 19 ref.

1995

บทคัดย่อ

Production factors affect the postproduction performance of poinsettia - a review.

 

Poinsettia longevity and quality are influenced by production and postproduction factors. Postproduction disorders include premature leaf, bract and cyathia abscission, epinasty, bract fading, leaf yellowing, and bract edge burn (BEB). Cultivars vary considerably in their tolerance of postproduction disorders. High average daily production temperatures or use of a negative DIF (low day/warm night temperatures) increases cyathia drop. Use of a negative DIF has been shown to increase the incidence of BEB. Production temperature has not been shown to have a significant influence on leaf drop. High irradiance levels are necessary for optimum growth, bract colour development and cyathia retention prior to and following anthesis. Low fertilizer rates (3 g Osmocote 14-14-14/15 cm pot or liquid fertilizer supplying 250 mg N/litre at every watering) minimizes leaf drop. Higher fertilizer rates may increase leaf drop and the incidence of BEB. Plants must be shipped at temperatures between 13 and 16 deg C

to avoid bract discoloration resulting from chilling injury. Light levels indoors must be equal to or greater than 7-10 micro mol m-2 s-1 unless temperature is between 16 and 21 deg to avoid leaf drop.