Do you go for a drop - down organization or an accordion system ? At first glance , it might not be entirely clear what that question is about , but when you consider that these are both net systems , the man of the puzzle start to fall together . Marcel Schulte , care theatre director of Holland Gaas , explains why this alternative is currently a ' red-hot topic , ' with the demand for dirt ball netting picking up considerably , lately .
First of all , what is a fall - down system of rules ? " There are really two types of drop - down system . One system is mounted to the nursery deck and air windowpane and is pulled in when the air travel window close . With this system , about two - thirds of the vent window area is shade - free . "
Left , drop - down organisation type 1 : undetermined . Right , fall - down system type 1 : closed
Another organization is put on in the greenhouse cover opening in the full windowpane opening .
price per yearCompared to a nursery without net , both pearl - down system are still a great deal right - they serve their purpose of keep insects out . Marcel : " In terms of shading , there is a well pick : the accordion system . While this is more or less more expensive to buy , it go much longer than a drop - down system , so in the end , the costs per year are considerably lower . "
leave alone : Accordion organization : shut . Right : piano accordion system of rules : open up
Less ventilation lossThe melodic line throughput is importantly better with an accordion arrangement than with monotone mesh installed in the deck surface . This is due to the much larger exchange surface . This is further enhanced by the ventilation possibilities of the sides of the zephyr windowpane .
now , there are new developments with mesh concoction in the corner . This prevents problems with clean the glasshouse cover , keep down the package , and increases ventilation .
Less unclouded lossAn squeeze box system is also more favorable in terms of light loss . Holland Gaas also calculated this . " With a drop - down system mounted to your glasshouse deck , you have about 5 % light exit . With the accordion organisation , it ’s only about 1 % , compared to the transmission of the total glasshouse roof region . If you assume the principle of 1 percentage light loss = 1 percent production loss , then with a drop - down organization , you are in reality behind after only 1 year . These calculation are done by experts but are , of course , also offer to TNO for check . "
More requirement for meshWe in short touched on it in the introduction : the need for insect netting is increasing considerably . Why is that ? Marcel : " The use of pesticide is being increasingly reduced for various reasons . You see this in genus Gerbera and chrysanthemum culture , among others , but also certainly in veggie culture . "
Also , Het Nieuwe Telen ( The New Cultivation ) play a role in the increase requirement . " Ventilation simplification used to be seen as the biggest disadvantage of insect net . "
" This is partly still the fount , however , now , the great unwashed ventilate and screen in a different manner . melody vents open less far and less often on average . Growers deal the climate very otherwise , largely to save vim . "
" If you do n’t fully open air vent-hole without engagement , you could use meshing to start the air venthole further . In this style , you maintain the clime , but now without insects enter the greenhouse . So you have the best of both worlds because the disadvantage of mesh mostly vanishes . Growers often initially see it as a ' necessary evil ' because their crop tribute products are no longer permitted . After installation , they soon see the advantages of growing with insect netting . "
For more entropy : Marcel SchulteHolland GaasHonderdland 302676 LS , MaasdijkTel . : +31 ( 0)174 - 516 180[email protected]www.hollandgaas.nl
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