Abstract
Light-emitting diodes (LED) are a promising light source for the cultivation of edible vegetables in greenhouses. The spectral radiation of the light sources has an impact on plants physiological parameters, as well as on morphological features. In this study the growth of spinach plants has been carried out in experimental boxes under two white LED treatments having different correlate color temperature (CCT): the cold lighting (CL) corresponded to 6500 K, while the warm lighting (WL) to 3000 K. The work was aimed to investigate the influence of the two light spectra on plant development and comparing the results. Results showed that the different lighting treatments impact differently on plant development and on growth parameters.
Highlights
The use of artificial lighting in horticulture is common in greenhouses when daylight radiation is not sufficient for plant growth: for this scope, supplementary lighting is largely used during winter in Nordic regions and, to a lesser extent, in southern countries
This shows that theplants spinach plants growof inthe both of the Light-emitting diodes (LED) lighting conditions, butCL
The early plant growth under cold lighting (CL) condition seems to be confirmed by the presence of hastate leaves in these plants since the fourth week, which emerged in the fifth week under warm lighting (WL)
Summary
The use of artificial lighting in horticulture is common in greenhouses when daylight radiation is not sufficient for plant growth: for this scope, supplementary lighting is largely used during winter in Nordic regions and, to a lesser extent, in southern countries. Plant growth demands the provision of lighting for many hours per day, so artificial light sources used have a relevant impact on energy consumption. The photosynthetic process, which allows the plant to transform radiant energy into chemical energy for producing its nutriment, is operated by different types of photoreceptors, sensitive to light at specific wavelengths. Among the most relevant photoreceptors involved in the photosynthetic process of plants, there are chlorophyll a and b, which absorb light mainly in the blue and in the red region, and partially in the UV region between 300 and 400 nm, and carotenoids, which absorb in the band between 400 and 500 nm
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