PHYSIOLOGICAL ASPECTS OF SUPPLEMENTARY LIGHTING IN HORTICULTURE

Improvements in lighting technology (more efficient lamp types, luminaires etc.) and lighting strategy for plant growth have resulted in a considerable increase in the use of supplementary lighting for many greenhouse crops.
Year-round production is now a reality in many pot plants, cut flowers and vegetable crops even grown at locations far north.
Supplementary lighting (SL) has a significant influence on several important processes in plants such as photosynthesis and growth, photomorphogenesis, floral evocation, flower development, yield and quality.

This paper mainly deals with the impact of (SL) on these processes.
Some important aspects of SL will be discussed of such as 1) Light integral per day (daily light sum), 2) Light level versus light integral, 3) Duration of lighting per day (photoperiod), 4) Light spectrum (light quality) 5) Interaction between natural light and SL and 6) Interaction between SL and CO₂ enrichment.

III International Symposium on Artificial Lighting in Horticulture

R. Moe

https://doi.org/10.17660/ActaHortic.1997.418.1