In the fall , winter and early fountain there is too little sunlight for optimal product . Every percentage gunpoint extra igniter will conduct to increased photosynthesis and moreover helps heat the nursery , say Cecilia Stanghellini of Wageningen University & Research .
As a physicist , Cecilia Stanghellini specialises in greenhouse clime . She is associated with the Greenhouse Horticulture line of work unit that acquire the Winter Light Greenhouse . This advanced greenhouse maximise light incidence and furthermore is highly muscularity efficient . The crop trials in this greenhouse show that special year - round light is transformed into additional production .
The elevated light transmission is not only an arena for attention for agriculturist who are bear a unexampled nursery built . Even in an existing nursery , you could achieve a fairly considerable idle gain through effective cleaning and prevent big condensation droplets as well as reflection from the greenhouse cover .
‘ This is especially welcome in the low - light menstruation , ’ she says . ‘ The well - known ruler of thumb is : 1 % more unclouded yields 1 % higher output . While this does not apply throughout the full year , it for certain applies in wintertime . This is clearly evident from the light response curve ( see Figure 1 ) . During the winter , you are place in the steeply rising part of the curved shape . Every pct tip extra light then distinctly lead to increased photosynthesis . ’
trope 1 . Light Response Curve
Highergrowing temperatureSolar radiation is packed with energy . craw use this energy for photosynthesis . Furthermore , it warms the craw and the glasshouse . ‘ In other words , when more solar radiation sickness enters the nursery this not only meliorate photosynthesis . The higher temperature also accelerates the plant ’s processes . The crop develop quicker , ’ she says .
The agriculturist can apply the glasshouse temperature to see to it the crop ’s ontogeny . With increase light incidence , growers can reduce heating and can even keep a higher crop temperature by setting the airing set - point higher . Stanghellini : ‘ Due to the high temperature , the crop ’s desiccation will increase . This will increase the humidity . It is important that you do not like a shot ventilate the additional wet , as you will then largely lose the extra energy gains work by the increase faint relative incidence . ’
Earlier productionThe big question is whether , for example , an 8 % step-up in light in wintertime have a dispute . The tribulation in the Winter Light Greenhouse clearly answer this question : improving light incidence definitely make sense . ‘ When you calculate it on an annual foundation , it is not that much . But that is not what this is all about . particularly in the small - light season , extra light influence production and the speed of product , ’ she says .
In a new crop in winter , part of the irradiation does not go down on the plant , but on the ground . ‘ But through reflection off the white groundcover , a with child part still arrive at the plants . Even a untested crop quickly develop a large leaf surface with which it captures the sun ’s radiation . ’
What should you do when there is spare light in the nursery in wintertime ? ‘ Allow the greenhouse to get ardent , do not ventilate too much and answer to the harvest ’s fast growth ; for case , by adjusting the CO2 dosing and watering . ’
For more selective information : ReduSystems+31(0)13 507 53 99[email protected]www.redusystems.com
