Greenhouse operations are increasingly using LED osvetlitev. Te svetilke ponujajo pridelovalcem številne prednosti v primerjavi s tradicionalno HPS razsvetljavo. To jim omogoča uporabo obrezovanja- ali ciljanja-specifičnih receptov za svetlobo.
But how exactly plants react to LED light is often unknown. That is why the Poslovna enota Vrtnarstvo v rastlinjakih in cvetlične čebulice of Wageningen University Research (WUR) in The Netherlands has developed a line sensor that measures which wavelengths a plant absorbs and to what extent, and investigates the consequences of this.
Svetloba vpliva na rast pridelka na več načinov. Količina svetlobe, ki jo prejmejo listi, določa fotosintezo in s tem rast pridelka. Svetlobni spekter je odgovoren za razvoj rastline, kot sta kakovost in raztezek listov. Poleg svetlobe sevanje vsebuje tudi toploto, ki vpliva tudi na razvoj pridelka.
V mnogih od teh vidikov se LED razlikuje od sončne svetlobe in običajne razsvetljave. Poleg tega lahko pridelovalci LED uporabljajo na nove načine: svetilke se lahko kadar koli vklopijo in imajo drugačen položaj glede na pridelek.
Toda učinki teh sprememb niso znani. Katere dele svetlobnega spektra zajamejo listi? Kaj na primer naredi rastlina z UV ali daljno{0}}rdečo svetlobo? In kakšen vpliv ima pomanjkanje sevalne toplote iz vira svetlobe? Obstajajo senzorji za merjenje svetlobe, vendar ti senzorji opravljajo tako-imenovano točkovno merjenje ali pa se ne integrirajo v določenem spektralnem območju.
That is why WUR developed a spectral line sensor that can be placed in and under the crop, and thus measure during different times which wavelengths are captured and to what extent. It is important to determine the crop reactions and to assess how the spectra affect the crop. The WUR is currently working on a follow-up to the developed prototype, which is expected to be ready in April 2022. The project, "Insight into sunlight and LED light," is financed by the Ministry of Agriculture, Nature and Food Quality in the Netherlands within the program Kas als Energiebron, in collaboration with SpectraPartners and JETI.
