Following a theoretical study by TNO and WUR on ways to improve the insulation of greenhouse screens, Wageningen UR Greenhouse Horticulture has conducted a 2014 trial involving four screens. The trial has now been completed, with a final report becoming available.
With the high wire cultivation of cucumber, the new screen configuration met with theoretical expectations. Compared to a standard greenhouse with a single energy screen, 44% less energy was required to heat the greenhouse from January to May. Production and product quality were comparable to those of a good trial company.
The climate in the greenhouse did change significantly because of the intense screening. A noteworthy effect was the increase of plant temperature caused by reduced cooling. Also noticeable was the absence of sudden drops in temperature and moisture deficit, which normally occur when a screen is closed in the evening or opened in the morning. This is an important step in reducing problems with mold as a result of the temporary loss of evaporation pressure while root pressure remains.
Although these solutions aren’t yet commercially available, they seem to offer promising tools for future cultivation.
Read the rapport at Energiek 2020.
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