A semi-log plot of time and temp, representing treatment conditions successfully used for the heat curing of ‘Wedgwood’ iris bulbs, resulted in a wedge shaped distribution of points. A line passing through the lower side of this distribution was interpreted as the locus of min time values at given temp for the successful heat treatment of iris bulbs. Several time-temp treatment combinations from points along this line and other combinations were selected for forcing trials with ‘Ideal’ iris. After subtraction of correction values based on a 2-day period of delayed bulb response, the corrected equivalent units showed positive correlation with the earliness of the 50% flowering date, the decreasing lengths of first and fifth leaves, and the decreasing number of leafy plants. The per day effect of treatment at 32°C declined beyond the 10th day. The equivalent unit method is a new procedure for calculating the heat curing response for bulbous iris,
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