MATERIALS | AGRICULTURAL FILM
winter to minimise additional heating costs,” said Grégory Coué, technical manager at the company. At the same time, Kafrit of Israel shared detail of
its Valota project to develop cooling greenhouse film. The films, comprising layers of LDPE, metallo- cene LLDPE and EVA, were applied to crops of cucumbers and tomatoes in Italy. Trials ran in 2016 and 2017. The film contain near-infrared (NIR) reflecting pigments, and help to reduce internal greenhouse temperatures by around 6°C at the peak of the summer. “Calculating optical and thermal parameters of the films can be a useful tool for development and efficiency evacuation of heat suppression films before field trials,” said Hanna Schwarz, agrifilms and films team leader at the company.
Crop models Researchers at Wageningen University in the Netherlands said that methods to model the effect of greenhouse films on crop yields deliver answers more quickly than actual growing trials. The team has assessed physical models such as Kaspro, Intkam and Raypro, which account for various levels
of light, carbon dioxide, temperature and other factors – which can all be controlled by greenhouse film – in order to predict their effect on growing conditions. Light, for instance, is critical: a 1% increase in light levels accounts for around the same increase in production for most crops; at the same time, a 10% increase in diffuse light can boost production by 1.5%.
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.ami.international �
www.trioplast-agri.fr �
www.braskem.com.br �
www.ufu.br �
www.hydroxtech.com.au �
www.novamont.com �
www.repsol.com �
www.ows.be �
www.basf.de �
www.evalevoh.com �
www.arkema.com �
www.kompuestos.com �
www.kafrit.com �
www.wur.nl/en
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