Geothermal energy, which used to be somewhat of a nuisance at the Jack Liskey ranch near Klamath Falls, Oregon, is now finding commercial application in a new greenhouse venture. Once used for house heating and, after cooling in surface ponds, for stock watering and crop irrigation on the 300-acre ranch, the 195°F water now heats an expanding complex of greenhouses. Construction of the complex began at the end of 1977, and the present crop was planted in April, 1978