Abstract
Root zone heating on New Guinea impatiens (Impatiens X hb.) in single pots was evaluated under computer-controlled growth chamber conditions. The effects of root zone heating and air temperature on dry weight, fresh weight, leaf area (plant canopy temperature), and plant water use were determined. Measured plant water use correlated highly with plant dry matter production for both heated (r2 = 0.96) and controlled (r2 = 0.93) plants. Measured plant transpiration and evaporation rates compared favorably with values predicted by the Monteith evapotranspiration model (root-mean-square errors = 0.37 and 0.30 mm/day, respectively). Even when air temperatures were held around 128 C, a root temperature at 248 C increased plant dry matter. Total plant water use was significantly increased by higher root zone temperatures.
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