Colored light is also helpful when used to help mark obstacles or highlight controls, such as red for emergency purposes. Colored light can be harmful when it distorts natural colors, lowers contrast, or decreases working efficiency. In these situations colored light indirectly increases the risk of injury. Remember that human eyes do not see all colors equally well and that different animals are sensitive to different colors. Computers and Programmable Electrical Controllers Computers are playing an increasingly important role in agricultural work.
Safety is enhanced while the drudgery of various types of farm work is reduced.
The list of uses for computers in agricultural applica-tions is continually growing. Computers and controllers are used to control equipment designed to maintain climatic comfort inside buildings. Ventilating systems and fans, furnaces, and air conditioners are turned on and off according to preprogrammed temperature and humidity settings. Computer-controlled operations such as feeding and cleaning reduce the chore time workers spend in animal housing environments, minimize the amount of fertilizers and pesticides placed in the field, and help sort and grade fruit. Funding provided by the Michigan Agricultural Health Promotion Project, a cooperative agreement among Agricultural Engineering, the Cooperative Extension Service Agricultural Safety Program, the College of Human Medicine and the National Institute for Occupational Safety and Health.