DOE conservation is an pressing issue in glasshouse gardening , and within culture always has a unmediated link with wet direction . During an interactive coming together organized by Ridder on 19 June in the World Horti Center , Frank Kempkes , DLO investigator at Wageningen UR , highlighted relevant insights in the field of greenhouse clime optimization covering themes such as energy conservation , moisture management , light optimisation ( let in light-emitting diode Inner Light ) , screen technique and heat direction .
So is moisture a champion or a foe ? Most of the growers present at the event opt ' ally ' .
How much moisture should plants vaporize to observe a good greenhouse climate ? And when vapour is controlled , how much vigor should it take ? To keep the moisture pct in balance , there are some riotous ingredient , but also controlling ones , thankfully .
Click here for a photo printing of the afternoon ( in Dutch )
Frank Kempkes , research worker at Wageningen UR give a masterclass on this discipline at the World Horti Centre in Honselersdijk , the Netherlands .
insulate screensInsulating screens dispute with wet direction . The benefit of screens include reducing heat demand ( energy saving ) , and ensuring a homogenous physical body - up of upright ( greenhouse climate ) .
To take out wet , screens tend to be open . Yet , open screens create a climate dissymmetry . That ’s why growers favour to keep their screens closed . This is why the screens and moisture management conflicts .
Frank is not in favour of opening sieve . It chip in to dehumidification , however it also disrupt the greenhouse clime . " You ’d rather make barriers that limit airwave motion , " he say .
Using two to three screens in a glasshouse seems to become standard . Frank excuse that 3 screen on 2 wire beds is the compromise . Otherwise , the Law of diminishing returns comes into play .
Moreover , he touches on the importance and upshot of the various types of silver screen properties . The optical , water tape transport , actinotherapy properties and air permeability of the screen affect light contagion , ( convective ) fluxes , sensitive , latent and radiant heat .
In the example computation shown by Frank , you could see that screenland fabric affect muscularity consumption and the amount of light . " However , do n’t underestimate the screen ’s mood of use either . By mode of use , I mainly mean screen time and the opening of the screens . "
Michel Grootscholten ( MG Grand bv ) , and Johan van Erven ( Ridder).Click here for a pic impression of the good afternoon ( in Dutch )
LightingWhat ’s the kinship between exposure and vapour ? vapour costs energy . The heat output of Son - t is unlike than that of leave . It also has a unlike effect on evaporation and therefore moisture management . When LED radiation syndrome is used , a large part is sop up by leaves .
Eric van Nieuwkoop , Amos Westerveld ( Agro Care ) , and Matthijs van Dentop ( Beja Fleur).Click here for a photograph impression of the afternoon ( in Dutch )
Active or non - alive dehumidificationThere are several way to dehumidify . Frank cite some of them : opening windows , screen booth , forced exchange through screens ( such as the Airmix ) , blowing in international air ( by using a high temperature exchanger ) or by active dehumidification ( by using a warmth ticker ) .
Side note : the more alive dehumidification , the greater the investment . There necessitate to be a balance between the provision and the removal of wet . mood control tools help to control the mood and therefore moisture . When these tools are correctly used , it is potential to get undecomposed results .
Panel discussionIt is hard to give an univocal answer to the questions get up in the first paragraph as there is no one - size - fits - all approaching as each nursery , scheme , and harvest is dissimilar .
However , what is clear is that opening screens is not the good solution for dehumidification , because of the tumultuous influences . One should also not underestimate the heat that issue forth from lamps .
The glasshouse pack of cards is often wet on the inside , resulting in condensation which affect light transmittance . Paul van Gils ( Lumiforte ) says there are possibility to dehumidify through the window . " The droplets in the greenhouse are unneeded . There are simple solutions such as anti - condensation coat . This is applied to dry glass . " Antireflect coating , which is now mainly applied on the outside , can also be lend oneself on the interior . It anti - reflects , thus allows for more light in the glasshouse and move out excess moisture . "
Peter Geelen , and Jan Voogt of Plant Empowerment were also present during the masterclass . They postulate who actually carries out moisture percentage measurements . Only a few participants did . Indeed , Joost Veenman from Ridder agree on the grandness of measurements . Measurement are the start point for accurate moisture direction .
No one - size of it - fits - all approachA one - sizing - fits - all approach does n’t work , " underscore Johan van Erven ( Ridder).We should aim for seamster - made solutions . As it is a complex exit , there is no conclusive advice for everyone . "
The event made clear that energy preservation and wet management are pressing issues in greenhouse horticulture .
For more entropy : Paul van GilsLumiforte[email protected]tel 06 460 57 223
Rob van HulzenVan der Ende Group[email protected]+31643353604
Johan van ErvenKnight[email protected]+31 6 53352477Erik StappersPhilips Horticulture[email protected]+31 6 1583 3825
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