| Summary: | 碩士 === 國立臺灣大學 === 園藝學研究所 === 96 === Pineapple flowering could be induced naturally by low temperature during winter in Taiwan. Natural flowering makes it difficult for growers to schedule harvest time and yield, and decrease price of pineapple. The object of this thesis is to study the effect of slip weight, planting time, shading and nitrogen application on inhibiting pineapple natural flowering caused by low temperature of winter.
In calcium carbide treatment, the flowering percentage of middle and large slips were decreased as planting time delayed, excluded plants planted only one month. The flowering percentage reached 50% when plant weight was heavier than 530 g. In low temperature treatment, the flowering percentage increases as the planting time being advanced and slip weight increased. Small slips planted less than three months did not flower after low temperature treatment. Flowering percentage was only 10% after treated with low temperature same for middle and large slips planted only one month. Planting small slips or planting near winter, could decrease the flowering percentage after winter.
Pineapple natural flowering could be delayed with 70% and 90% of shading, and had little effect on growth rate. Time to flowering was delayed with increase shading level. Flowering was delayed for 2 and 4 weeks by 70% and 90% shading treatment, respectively. Harvest time of 25% of fruits in70% shading treatment were delayed for 2 weeks, and all fruits in 90% shading treatment were delayed for two weeks. Fruit weight of each treatment did not have significant difference.
Applying urea could accelerate leaf growth in pineapple. Apply of 40 g urea on pineapple with 40-50 leaves and watering every two weeks could inhibit natural flowering effectively.
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