| Budget Amount *help |
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1989: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1988: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Research Abstract |
This study was conducted to establish new cropping system for autumn flowering in tulips, tazetta narcissus and Asiatic lilies. In tulips, bulbs were rooted at 15ﾟC for 3 weeks after planting in September or October and cooled at 1ﾟC for 2 weeks. Thereafter they were frozen-in and held at -2ﾟC for more than 10 months. When the bulbs were transferred from -2 ﾟC to a greenhouse in the next autumn, they produced flowers with a fairy high quality at high percentages. Longer flower stems were obtained at growing temperature of 15ﾟC. On the other hand, freezing storage of bulbs at -2ﾟC under a dry condition usually resulted in lower flowering percentage and flowers with a poor quality. Moreover, proper cultivars should be selected for this freezing-in technique because some cultivars did not show any good results.
In Narcissus tazetta var chinensis, retardation of flowering was accomplished by storing bulbs at 5-10ﾟC for up to 10 months beginning in early July, before initiation of flower buds. After the cold storage under dry conditions, bulbs should be kept at optimum temperatures for initiation and development of flower buds and grown at temperatures below 25 ﾟC.
In Asiatic lilies, high flowering percentages and a high flower quality were obtained irrespective of different flower bud initiation time in different cultivars used, when bulbs were packed in a moist sawdust just after arrival, precooled at 1ﾟC for 4-8 weeks and thereafter frozen in at -2 or -4ﾟC. Later sprouting was observed in bulbs stored at -4ﾟC and as a result, flowering time was remarkably delayed in late September planting. Planting in hot summer resulted in a marked lowering of flowering percentages and a flower quality.
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