Greenhouse climate and keeping quality of roses.
Mortensen, L. M.;
Acta Horticulturae Year: 2001 Issue: No. 543 Pages: 199-202 Ref: 15 ref.
2000
บทคัดย่อ
The effect of relative humidity (RH) and lighting period (LP) on the postharvest keeping quality of cut roses was studied in a series of experiments. The 14 cultivars responded very differently to high RH. Vase life of Frisco, Golden Gate, Dream and Kardinal was moderately reduced, while that of Orange Unique, Miracle, Prophyta and Amadeus was markedly reduced by an increase in RH from 75 to 91% (with a LP of 18 h/day). In a later study, the vase life of many of the 14 cultivars was negatively affected by increasing the LP from 18 to 24 h/day (at 75% RH). Generally, the cultivars which were sensitive to high RH were also sensitive to the increase in LP. Increasing the period of exposure to high RH (90%) above 12 h/day, to 18 and 24 h/day, reduced the vase life of cv. Amadeus. Exposing cv. Amadeus plants to high RH for more than 6 h/day resulted in a decrease in the percentage of roses which opened properly. The analysis of the relationship between the greenhouse climate and vase life of roses cu
ltivars (Trixx, Sacha and Amadeus) from 6 Norwegian rose growers, which started in January 1999, showed that the vase life of the same rose cultivar from different growers varied. When the water loss of detached leaves was measured, a relatively close relationship between increasing rates of water loss and shorter vase life was observed, as shown by cv. Amadeus. All leaves which had a high rate of water loss came from greenhouses where continuous lighting was used or from a greenhouse with a high RH (85% as a mean combined with 20 h/day LP) during the first months of 1999. In contrast, long vase life was generally associated with roses from greenhouses maintained at below 80% RH and a LP of 20-21 h/day.