RECENT DEVELOPMENTS IN THE USE OF ELECTRICITY IN HORTICULTURE IN THE USA
For years greenhouses were considered as places to produce flowers out-of-season. Cut flowers and potted plants were the major commercial products. This has been changing in the United States. The greenhouse industry now comprises of four main groups of workers: commercial florists, bedding plant producers, nurserymen, and vegetable crop producers. Each of these enterprises involves cultural practices, management, mechanization, and environmental control. Electricity is a primary source of energy for mechanization and environmental control. Research, development, and experimentation, combined with sociological and economic developments, have resulted in greatly expanded use of electricity and electrically-operated equipment. These will be discussed under three headings: 1) Field production; 2) Greenhouse production; 3) Controlled environment production in growth rooms and growth chambers.