The screen position varies following change of outside condition, which lead to more stable light level in the greenhouse. With this smart way, higher PARsum is obtained each day compared to the ‘old’ shading method, resulting in better plant growth.
First application of PARperfect in China at rose greenhouse
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- Greenhouse:
- Lijiang Modern Flower Industry Park
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- Location:
- Yunnan, China
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- Crop:
- Cut roses, cut calla
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- Challenge:
- Maximize energy savings, optimizing light
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- Solution:
- PARperfect, Tempa 8672 D, Luxous Light FR
MAY 2024
Under the Jade Dragon Snow Mountain in Lijiang, China, 35 ha of high-tech greenhouses have been built since 2019 for cut rose and calla production. The site combines unique local growing conditions with advanced facilities and selected cultivars, helping create the “丽江の花” (Lijiang Flower) brand.
An ideal greenhouse environment
Nemo Yang, technical consultant of Lijiang Modern Flower Industry Park, says the operation uses substrate cultivation and an advanced climate control system to create an ideal greenhouse environment and support higher yield and quality.
“The D/N temperature difference is large and the sun radiation is rich which benefits rose cultivation in Lijiang. However, we have to consider maximum energy saving especially facing low temperature at winter nights.
Double layer Svensson thermal screens are installed to reduce the energy cost for both day and night. Another challenge is solar protection. From April, the solar radiation becomes stronger and fluctuates frequently and intensively. We do need a shading solution to create more homogenous and stable light environment in the greenhouse.”
After PARperfect launched in the China market, Nemo contacted Svensson and the site became the first PARperfect project in China.
“There is 5 ha PARperfect patent screen Harmony 2047 FR installed here as bottom layer. Sensitive rose cultivars which need more solar protection are grown under this screen. We can feel the light become soft and even when this screen is in position.”
Stable light levels
Neo Wei, who is in charge of greenhouse climate control, describes how the double-screen setup supports more responsive light management using in-greenhouse measurements rather than only outside radiation.
“We can control the light more flexibly and accurately through the combination of double layer of screens. We used to decide when to shade and how much to shade according to the outside radiation. Together with Svensson climate expert, now we can control the light based on PAR sensor data. The screen position varies following change of outside condition, which lead to more stable light level in the greenhouse.
With this smart way, higher PARsum is obtained each day compared to the ‘old’ shading method, resulting in better plant growth.”
Nemo adds that rising expectations for flower quality push growers to keep innovating, and that getting full value from climate screens depends on practical experience backed by technical support.
“Higher flower quality demand from consumers drives growers to do better job. Besides investing in advanced equipment, it is necessary for us to try innovative solutions and get new knowledge by ourselves from practice. We hope more flower growers will implement PARperfect in their greenhouse. The value of climate screens can be realized with knowledge support from Svensson. Together with them, we believe a better tomorrow!”
Curious what made it all work?
