" The estimation is not for everyone to set out experimenting when a lot is already have a go at it . " That ’s what mood specializer René Beerkens said during his presentation at a particular agriculturist result on the energy crisis at Tomatoworld . All uncommitted seats were pack with raiser from far outside the Westland region ( Flemish growers were also present ) , and a few even had to be turned by , with no spaces leave behind . attender had the hypothesis of information - driven , DOE - efficient culture explain to them , as well as practical tools where potential .
The opening night spoken communication came from Miranda van hideout Ende of Tomatoworld . " Energy commonly warms you up , but at the moment , it have us shudder . " At the event itself , however , the atmospheric state was buzz , and with a presentation by former F1 number one wood Robert Doornbos as a opulent stopping point , the serve cultivator and a handful of supplier locomote off for drinks in secure spirit .
Ab van Marrewijk speaking . Photo : Joyce van Dalen ( Tomatoworld )
Whistling gas tap reassuresDuring those drinks , Miranda took the opportunity to say a few tidings aboutAb van Marrewijk ’s farewell . He is lay off after 2.5 years as a grower at the horticultural monstrance center to focus on other projects .
His farewell was also briefly mentioned at the start of the good afternoon , after which Ab himself was the first to speak . In it , he went back to the 1980s , to the ' first code red . ' At that time , grower Ab ’s heart were severely try with -10 degrees Celsius outside and a punishing eastern tip . " Several time a nighttime , I would get out of bed , trousers over my pyjama tail end , and pop into the greenhouse to see if everything was still forge . If I then heard the gasolene spigot still whistling away , it gave me some peace of psyche again . "
Ab managed to bridge the spread like a shot to cultivation practice with a few more anecdotes . For case , a story about drinking a crate of beer with protagonist and then filling the empty bottles midway with H2O to use them creatively to keep an center on the temperature in the greenhouse .
Robert Solleveld accentuate the importance of continue research within Kas als Energiebron , among others . exposure : Joyce van Dalen ( Tomatoworld )
' Three crucial sensors’The follow speakers did the same . Mark van der Werf and René address the theory behind Plant Empowerment . In doing so , at the petition of Robert Solleveld of Glastuinbouw Nederland , they skipped quite a few page in their display to go straight to the conclusions . Using a serial publication of ( attention - grabbing ) points , a lot of practical tips were shared with the audience .
Getting good data was one of those peak . René discussed what he call " three crucial sensors " for grower : a measuring boxwood above the screen , a pyrgeometer , and an RH detector on the exterior of the greenhouse . attendant were asked to indicate by raising their deal whether they already owned a detector like this . More than half had a measure box seat , and coupling for clime control was less vulgar . A pyrgeometer is also fairly well institute , at least much more so than five years ago , Mark direct out . One of the growers in the room indicated that thanks to this detector , he has started to screen an estimated 20 % more thanks to insights on radiation .
The third sensor is the RH sensor outdoors on a meteorological mast . This sensor gives the grower a number to steer by or else of , as René outlined , now often in practice , ' looking at the sky ' ( a lovely dispirited ) and at the wind direction ( mellow northerly winds ) is used to check whether to keep the windows close .
Mark van der Werf and René Beerkens . Photo : Roel Dijkstra Photography
Plan based on lightAnother important piece of advice to growers is to make a plan based on light . Mark explained that it is quite potential to plan ahead for the whole yr and then just ok - line on the day itself . It is important to find a 24 - 60 minutes temperature for the amount of Inner Light .
peculiarly now that the lights are being left off or used less this wintertime , break can appear in the idle remark . The agriculturist has to represent on that . If it is up to Plant Empowerment proponents , cultivator will presently no longer spill the beans about ' what 24 - time of day temperature they had ' but about the speed they made . The DLI , Daily Light Integral or unaccented heart and soul , is important for that . Furthermore , instead of talk about Joule , growers should talk more about the groyne / PAR ratio .
midway through the program , there was a light break and , afterward , more extensive drink . exposure : Joyce van Dalen ( Tomatoworld )
Economical ventilationThe screen then exhibit an image of an one-year plot of net radiation data , shown in red and blueish . This provided a funnel - shaped image from a task with Het Nieuwe Telen ( The New Way of growth ) at Vereijken Nurseries . The information gives brainstorm into whether a plant can still vaporize . A piffling trial in between show that few agriculturist still screen on the radiation act . A must , harmonise to the specialists .
With two other graphical record , René show that ventilating 4 % less can yield big energy preservation . The clime specialist compare the strategy of the character agriculturalist in the Autonomous Greenhouse Challenge with tomato plant with that of the victor . They vent 7 % over six months instead of the reference growers ' 11 % . The term pre - night reduction also fell in this context . According to the utterer , something to be careful with because , at that moment , a lot of Energy Department is lose , while allow the temperature drop more steady is also possible .
Slide on ventilation from Mark and René ’s presentation in which René showed what the conflict was between the winners in the Autonomous Greenhouse Challenge and the reference growers ( with a recognizable peak for a pre - night decrease on the right )
save evaporation goingTo keep evaporation going , air cause is something that , peculiarly now that energy is expensive , is getting more attention . Putting a minimal tube in is one - agency growers move the breeze , but the same can be done with a fan that is much more sparing . " At Tomatoworld , " René told us , " in guild to grow economically , we are also currently interfering looking at what can be done with getting air from above the silver screen and from outside . "
This bring us to screens , Ton Habraken ’s speciality . He hold a quiz with the audience and had five trophy to broadcast . capsicum pepper plant agriculturist Wilbert van den Bosch of Peppers Unlimited exact the top prize . He will be offered a free Energy Efficiency Analysis from all Plant Empowerment partner .
Air movementTon advised growers to always start with an even climate as a foundation . Without that , adjustments are difficult . Another piece of advice was to stop or at least minimise atmosphere gaps . It is also recommend , consort to Ton , to prevent air travel movement above the screen . To do this , place ridgepole divider is potential , as is closing bar every 30 - 50 meters . Ton pointed out to growers that ' an AC foil ' alone does not function here . Air is heavy , so a sturdy foil is needed to stop air move .
Thanks to screens , the greenhouse cap stays inhuman . That colder roof help with condensation and moisture remotion . Both Ton and the previous speakers also decidedly address input and output . In other Christian Bible , what do you put into the greenhouse ( or get for gratis ) , and what does it cost ? It has been have it off for years that getting 13 l of water out of the greenhouse costs one three-dimensional metre of gaseous state . you’re able to read more about this at Kas als Energiebron . Both contraction and the removal of wet from the nursery call for muscularity . The better the moisture balance , the less energy it cost . Now that growers are growing more economically and old ways of take on this trouble have become very expensive , new manner are require . The screen medical specialist advised the room to decidedly install an RH and temperature sensor above the screen cloth .
Role of forehead in lighting choiceThe last horticultural technology loudspeaker before former F1 driver Doornbos took the story was Sander Hogewoning of Plant Lighting . This metre , he focus on energy in ignition , as well as the ground why more and more growers are switch from HPS to ( full ) LED ignition . His basic peak in that regard to raiser : prefer a fixture that is efficient , with maximum micromoles per watt .
One of the point he dwelled on was radiant heat . It is often heard that agriculturalist are ( or fear ) missing that heat when switching to lead . Now light-emitting diode is certainly not ' cold light ' as Sander showed , but well-nigh - infrared radiation is indeed not provided by an LED reparation . A raiser stand under his HPS lights palpate that well , as he can feel the warmth from the lighter on his forehead . But the interrogation is whether the same is true for all plant . Sander showed that this is more nuanced .
Robert Doornbos , without very consciously cite it , pull in the comparison between Formula 1 and data - driven ontogeny . His introduction remain weak - hearted , include clips on what G - forces do to a person ( more than many people remember , so car drivers really are train jock ) .
AnswersRules of ovolo , such as ' 100 joule per bunch of tomatoes at a stem density of 2.5 ' , no longer apply when switching , Sander further showed . He also charge out that the commonly used light - to - temperature ratio ( RTR ) drops aggressively in reliability . Which light fixture to choose is a interrogative sentence Sander sometimes gets during presentment . On Thursday good afternoon , to his great atonement , this did not happen . or else , the lighting specialist advocates looking closely at what the plant require and what a easy fixture can do . Sometimes this is unmanageable because , accord to Sander , very little is still screw about on the nose when a craw can or can not evaporate .
An answer to this question would help the sector a lot , but as it is , it is not clear that this solution will arrive ( very ) soon . With all the other peak and advice offered , however , grower can move forward again . Not to remark the experience , tips , and cognition replace during the drink between growers and suppliers . It would be dependable if , even when the crisis hopefully recedes , such sessions with many agriculturist retain to take shoes more often .
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