Effect of Short-period Air-conditioning during Night on Yield and Characteristic Form of Cut Roses in Summer

Kajihara, Seiji; Ishikura, Satoshi; Fukushima, Keigo; Douzono, Mitsuru

doi:10.2503/hrj.14.365

Cited by 4 publications

(5 citation statements)

References 4 publications

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“…Another reason may be a difference in the cumulative temperatures between the two studies, caused by a time lag to reach the preset temperature. It took less than 10 minutes in the case of rose (Kajihara et al, 2015), but almost 90 minutes in our experiment. The integrated yield of cut flowers all through the harvesting period was not affected by any of the treatments in Experiments 1 and 2 (Data not shown).…”

Section: Discussionmentioning

confidence: 49%

“…In Experiment 1, the weight of cut flowers harvested in November was higher in the 18°C night cooling treatment than in the control. An increase in cut flower weight by night cooling treatments has been observed in rose (Kajihara et al, 2015) and lily (Ninomiya et al, 2012). In lily, the respiration rate decreased and the dry/ fresh weight ratio of the leaves increased as the DIF tended towards negative values with reduced night temperatures (Inamoto et al, 2016).…”

Section: Discussionmentioning

confidence: 92%

“…In Experiment 2, the cut flower weight was not affected by EOD-cooling or EONcooling, but was increased by the overnight cooling treatment. In rose, a 4-h EOD-cooling treatment significantly increased the cut flower weight, possibly by promoting translocation and inhibiting respiratory consumption (Kajihara et al, 2015). A 4-h EODcooling treatment may be too short to observe such an effect in carnation.…”

Section: Discussionmentioning

confidence: 96%

“…Consequently, there have been many studies on both qualitative and quantitative improvements in greenhouse-grown ornamental flowers in Japan by applying night cooling treatments using a heat pump. Night cooling treatments have been shown to prevent rosette formation in seedlings in Eustoma russellianum (Hirai and Mori, 1999), and to increase the weight and length of rose cut flowers (Kajihara et al, 2015;Sato et al, 2013a) and Oriental lily (Ninomiya et al, 2012). Kajihara et al (2015) developed a low-cost method with a shorter cooling treatment time (4 h from sunset instead of overnight) to maintain the quality of cut rose flowers.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Temperature and Timing/Duration of Night Cooling Treatments on Flowering Time and Quality of Cut Flowers of Standard Type Carnation (Dianthus caryophyllus)

et al. 2020

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The aim of this study was to develop efficient night cooling technology to produce high-quality carnation cut flowers. The effects of temperature and timing of night cooling treatments (applied using a heat pump) on the flowering time and quality of cut flowers were investigated for standard type carnation flowers grown in a greenhouse in hot conditions. In the first experiment, rooted cuttings of the carnation 'Exceria' were planted in a greenhouse on July 6, 2012. Night cooling treatments at 18°C, 21°C, and 24°C were carried out, and the harvested cut flowers were compared with those of a non-cooled control group. For flowers harvested in November, those from plants subjected to the night-cooling treatments had harder stems compared with those of the non-cooled control. In the next experiment, to determine the best timing and duration of the night cooling treatment, we applied three treatments to rooted cuttings planted on June 18, 2013; overnight cooling from sunset to sunrise, cooling for 4 h from sunset (End of Day cooling: EOD-cooling), and cooling for 4 h before sunrise (End of Night cooling: EON-cooling), and compared them with a non-cooled control. For flowers harvested in December, the node order of flowering was the same in the EOD-cooling treatment and the overnight cooling treatment, and was lower than those in the EON-cooling treatment and the non-cooled control. The number of days to flowering was shorter in the EOD-cooling treatment than in the non-cooled control. In October and November in the harvest season when the high temperature influenced the early growth stage, the stem quality of cut flowers was improved by night-cooling treatments, as indicated by a significantly smaller stem weeping angle than that in the non-cooled control group. These results suggested that an EOD-cooling treatment at 21°C for 4 h from sunset was as effective as an overnight cooling treatment to improve the quality of cut flowers by promoting stem hardness and flowering. This method is a costeffective and efficient thermal management strategy to produce high-quality carnation cut flowers in hot conditions.

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Section: Discussionmentioning

confidence: 49%

Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Effects of Temperature and Timing/Duration of Night Cooling Treatments on Flowering Time and Quality of Cut Flowers of Standard Type Carnation (Dianthus caryophyllus)

et al. 2020

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“…The effects of EOD-cooling on both the quality and quantity of cut flowers were also confirmed in rose (Kajihara et al, 2015). However, unlike in carnation, flowering in rose was not promoted.…”

Section: Introductionmentioning

confidence: 73%

Verification of the Effects of End-of-Day-cooling on Floral Differentiation and Cut-flower Characteristics in Carnation (Dianthus caryophyllus L.)

et al. 2021

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The effects of End-of-Day (EOD)-cooling on floral differentiation and cut flower characteristics in carnation were verified using both short-term model-based experiments in a growth chamber and long-term demonstrative experiments in a greenhouse. In the model experiment, flower buds were undifferentiated until 43 days after pinching in both control and End-of-Night-cooled plants. In contrast, in the EOD-cooling treatment, every set reached the reproductive phase by 22 days after treatment. At the same node position, a three-stage advancement in floral differentiation was observed after EOD-cooling, but not after the other two treatments. This suggested that EOD-cooling promoted both floral differentiation and development in carnation. For the demonstrative experiment, significant differences between EOD-cooled and control plants varied each year in days to flowering, node order of flowering, and stem weeping angle. Because environmental factors could affect variation, correlations between the diurnal temperature range and the difference in each survey component were examined using regression analyses. Moderate (days to flowering) and a strong (node order of flowering) correlations were found with the diurnal temperature range. Thus, the EOD-cooling treatment was advantageous in suppressing delayed flowering over a large diurnal temperature range during floral differentiation. The difference in stem weeping angle showed a strong correlation with the difference in minimum temperature during the stem elongation stage. Improving the stem quality by EOD-cooling tended to be effective under high minimum-temperature conditions.

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The Development of a Root-zone Environmental Control System (N.RECS) and Its Application to Flower Production

Muramatsu

Kubota

2021

Hortic J

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Here, we describe the current status of energy-saving techniques in greenhouse heating and countermeasures for high summer temperatures, and then introduce an outline and the performance of a newly developed New Root-zone Environmental Control System (N.RECS) and the effects of this system on flower production. Temperature control techniques used in protected horticulture include those that control the air temperature of the entire greenhouse space and those that control the local temperature of the plants. The running costs of the air temperature control techniques are expensive and the cooling capacity in the summer are inadequate for actual cultivation. Local temperature control techniques have relatively low running costs and can adequately cool plants during high temperature periods, but they are crop-specific and not versatile. Therefore, we developed a N.RECS that can heat and cool the root-zone of various plants with low running costs. N.RECS was produced by combining aluminum heat exchange panels, insulated pot trays and an airsource heat pump cold/hot water supply system. By using N.RECS, the root-zone temperature was maintained at 25°C when the air temperature was about 5°C during the winter and cooled to below 23°C when the air temperature was about 35°C during the summer. Root-zone heating of six potted flowers and cut flowers in the winter promoted growth and flowering and achieved energy savings of about 30% compared to conventional heating.When the two flower species, which are susceptible to high temperature, were grown under high temperature conditions, about half of the plants died, but root-zone cooling allowed all the plants to grow healthily. Therefore, it is concluded that N.RECS is a practical system that allows for both energy-saving cultivation in the winter and cooling cultivation in the summer. In addition, root-zone temperature is an environmental control parameter that should be controlled in future agricultural production; by applying root-zone temperature control as a standard technology for agricultural production, the growth of plants can be controlled more flexibly and more energy can be saved.

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Effect of Short-period Air-conditioning during Night on Yield and Characteristic Form of Cut Roses in Summer

Cited by 4 publications

References 4 publications

Effects of Temperature and Timing/Duration of Night Cooling Treatments on Flowering Time and Quality of Cut Flowers of Standard Type Carnation (<i>Dianthus caryophyllus</i>)

Effects of Temperature and Timing/Duration of Night Cooling Treatments on Flowering Time and Quality of Cut Flowers of Standard Type Carnation (<i>Dianthus caryophyllus</i>)

Verification of the Effects of End-of-Day-cooling on Floral Differentiation and Cut-flower Characteristics in Carnation (<i>Dianthus caryophyllus</i> L.)

The Development of a Root-zone Environmental Control System (N.RECS) and Its Application to Flower Production

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