| Summary: | 碩士 === 國立宜蘭大學 === 園藝學系碩士班 === 97 === Summary
This study was for the purpose of investigating various cutting methods and their improvements in Hippeastrum, and thereby to increase the propagation rate and growth speed of the bulblets, thereafter by means of developing a simple manipulation technology to achieve the best economic benefit in bulblet production. The cutting methods underwent investigation including notching, notching twin-scaling, notching coring and top-notching. The results showed that notching twin-scaling was the highest in number of bulblet formation, then notching and notching coring came next and both had no significant difference, and top-notching was the lowest. In comparison among cultivars ,‘Lady Jane’and‘Apple Blossom’was the highest in rate of bulblet formation, then‘Red Lion’came next, and‘Double Record’was the lowest.
The notching twin-scaling developed in this study is the improved method of notching technique. The bulbs were first cut into eight parts from the base evenly. The cutting depth was approximately 2/3 of the bulbs length but each equal part was not separated from the mother bulb. After two days curing, bulbs were placed into the moisturized vermiculite for 4 month incubation. In comparisons for the bulblet reproduction percentage in different seasons showed January and July were the highest and had no significant difference, October came next, and April was the lowest. The bigger the bulb circumference size was the higher the bulblet reproduction percentage obtained. The bulb with a circumference size above 20 centimeters can be the standard size for reproduction. The most suitable bulb cutting number is 8 equal parts. Compare with the twin-scaling, the notching twin-scaling technique had faster initial growth of bulblets and the bulblets were larger. Moreover it could shorten the growth in period from bulblet to flowering bulb. The result from the improvement on incubation method showed that initial period bulbs could put on non-medium incubation shelf, then place into moisturized vermiculite after one month later when bulblets reproduced. This method can avoid the scales rottenness , thus raising the bulblet formation rate and growth speed. Furthermore can save the manipulation management space.
In conclusion, the notching twin-scaling propagation technique effectively save nursery space, obtain higher bulblet formation percentage and shorten the initial growth period of the bulblets, therefore it can be applied to a simple massive and fast bulblets production program, and can also performed as a reference for commercial propagation of Hippeastrum bulbs.
Key words：Hippeastrum ,notching , notching coring ,notching twin-scaling , top-notching ,bulblet numbers ,bulblet growth
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