Graduate Thesis Or Dissertation
 

Utilization of the night-interruption phenomenon to hasten the seed increase of long-day cereals during short-day regimes in California and Arizona

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  • Tests were carried on in growth chambers and in the field to determine if the harvest of daylength-sensitive long-day cereals grown during the winter in Arizona could be hastened 30 days by the use of night interruption. Two durum lines which were near-isogenic for sensitivity to daylength were used throughout the study. The average day and night temperatures and daylengths for the Yuma, Arizona area during the period November to May and for the Santa Ana, California area from August through November were simulated in the growth chambers. Light for the night interruption was provided by incandescent lamps. Various intensities of light were tested and different durations of night interruption were applied. The night interruptions were initiated approximately one month after planting. From the studies it was learned that the date of harvest could be hastened 30 days by the use of incandescent lighting on the plants. To induce heading and hasten the harvest date by 30 days through the use of night interruption the following conditions had to be met: 1. The light intensity had to be at least 6 foot candle. 2. A night interruption of 6 foot candle intensity requires 5 hours of light (9:30 p.m. - 2:30 a.m.) each night. 3. Night interruption has to continue for approximately 85 days after it is initiated.
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