No lighting, but still two energy screens without dehumidification : tomato grower Van der Spek makes distinct choices

Gertjan van der Spek is the first grower in the Netherlands without supplementary lighting to install two transparent energy screens without any dehumidification system. This is his next step towards saving energy having already reduced the use of the minimum heating pipe and ventilating above the screen, instead of making gaps in the screen. In this way he hopes to use less than half a cubic metre of gas per kilogram tomatoes.