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Commercial strawberry production in Japan is seriously plagued by many problems, including lack of farm operation successors, sluggish commodity prices, and rising crude oil expenses. As a consequence, production areas and levels are continuously declining. For a solution of these problems, the spread of large-scale industrial facilities and the development of consistently high-yield strawberry production technique for large-scale greenhouse are required, and further this developed technique is also expected to be applicable to the small-scale family-managed greenhouse. For high yield production, the control of environmental factors (e.g., light, air temperature, CO2 concentration, humidity, and wind velocity) is essential to allow plants to realize their full photosynthetic potential. Light is one of the most important environmental factors affecting plant growth, and directly influences leaf photosynthesis and fruit yield in strawberry (Hidaka et al., 2012). Because of variable light environments dependent on factors such as cropping season and cultivation location, inadequate light levels frequently lead to declining productivity during greenhouse vegetable production in Japan. Consequently, the development of a supplementary lighting technique, not dependent on cropping season or cultivation location, is needed for consistently high strawberry production. Although supplemental lighting has been used to achieve high yields of some greenhouse vegetables, such as tomatoes and cucumbers (Demers et al., 1998; Hovi et al., 2004; Gunnlaugsson and Adalsteinsson, 2006; Trouwborst et al., 2010), there are currently few examples of supplemental lighting applied to strawberry production (Ceulemans et al., 1986). On the other hand, there have been many recent advances in LED light source technology, and the agricultural use of commercial LED lighting is expected to become more widespread (Goto, 2009; 2011). To aid in the development of supplemental lighting techniques in forced strawberry cultivation, we examined the effects of supplemental lighting on plant growth and yield using two different types of commercially-available light sources: LEDs and fluorescent lamps.

Effect of Supplemental Lighting from Different Light Sources on Growth and Yield of Strawberry