Osaka Prefecture University disclosed the internal situation of the "Osaka Prefecture University Green Clock Next Generation (GCN) Plant Factory" on September 17, 2014 (Figure 1). The factory uses LEDs for plant cultivation developed by Philips Electronics Japan (Headquarters: Tokyo, referred to as Philips). This large-scale plant factory is built on the campus of Osaka Prefecture University and is the fifth largest plant factory in Japan. It opened on September 19 and was officially put into production in early October. Philips hopes to accumulate technical experience through this plant factory in order to sell products in Japan.
Figure 1: Plant Factory "Osaka Prefecture University Green Biological Clock Next Generation"
The plant factory uses 13,000 Philips "GreenPower LED Production Modules". This is the first mass product equipped with far-infrared light (wavelength around 750nm) LED chip lighting, which can emit four kinds of light: red light, blue light, white light and far-infrared light.
The lighting used in plant factories is usually red, blue and white, because red light and blue light are more conducive to photosynthesis of plants. The use of far-infrared light at the same time can make the leaf shape of the plant complete during the growth process, improve the efficiency of photosynthesis, and accelerate the growth rate.
Osaka Prefecture University said: "Because it can promote plant growth and has excellent dustproof and waterproof properties" (Osaka Prefecture University Plant Factory Research Center Director Anbo Masaichi), GreenPower LED Production Module was adopted.
It only takes about 40 days from sowing to harvesting of lettuce and other plants in this factory. According to the company, this lighting can shorten cultivation time by up to 20% and reduce power consumption by 55% compared with ordinary fluorescent lamps. Since it also generates very little heat, it also saves air conditioning electricity used to manage temperature.
Figure 2: Lettuce about to be harvested
Figure 2: Lettuce about to be harvested
The plant factory was built through an industry-university-government cooperation project with Osaka Prefecture University and many other companies. It covers an area of about 1,300m2 and can produce 5,000 green leafy vegetables such as lettuce every day. The vegetables produced will be directly supplied to supermarkets and restaurants in Osaka Prefecture under the brand "Gakuencai" (Figure 2). Since vegetables carry less bacteria and have shorter transportation distances, their storage time is nearly twice that of vegetables grown in the open air. Although the price will be higher than ordinary vegetables, commercial operations will be carried out by ensuring quality and establishing a stable supply system. If there is demand, high value-added vegetables such as potassium (K)-free vegetables can also be produced.
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