T. Takakura
The area of protected cultivation in Japan is more than 42,000ha excluding mulching, floating mulching and row covering; it is the largest in the world. It has progressed in two ways: less sophisticated types of cultivation, such as rain shelters and floating mulches, along with heavily equipped facilities such as plant factories. More than 60 % of the total is not heated. PVC plastic houses are predominant in Japan because of their better thermal insulation against long wave radiation. Floating mulching without frames or poles using plastic nets or films permeable to water vapor is becoming popular to protect against wind and rain damage, thereby improving the thermal environment. Protection against hail and birds is another advantage of plastic nets. Treatment of plastic wastes has been tested and is now being undertaken in many local municipalities all over the country. Hydroponics has regained its popularity through NFT-type and rockwool cultivation. Greenhouse computer control is going to be based on expert systems and also on local network systems. Factory-style vegetable production has been adopted for the production of radish sprouts and lettuce. Seedling production is not yet an independent business but it is germinating aided by the development of both robotics and fine environment control.
Takakura, T. (1988). PROTECTED CULTIVATION IN JAPAN. Acta Hortic. 230, 29-38
DOI: 10.17660/ActaHortic.1988.230.1

Acta Horticulturae