Broadleaved uniola (Uniola latifolium Michx.) caryopses and florets were prechilled or not prechilled, supplied with potassium nitrate (KNO3) or water only, and diurnal germination temperature alternations of 15/30C or 20/30C were used. Caryopses and florets both reached 50% germination by 10 days after planting with KNO3; however, in water, caryopses reached 50% germination significantly earlier than florets (18 vs. 30 days). Germination temperature and prechilling had no effect on days to 50% germination. Final germination percentages were significantly higher for caryopses than florets at both germination temperatures and for caryopses germinated at 15130C than at 20/30C (85% vs. 74%). Significantly more seeds germinated with KNO3 than in water (85% vs. 57%). Prechilling had no effect on final germination percentage. Caryopses germinated with KNO3 at 15/30C achieved the highest final germination percentage.
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