Abstract: 【Objective】 The growth regularity and bulb propagation techniques of the 2 lily groups under the open conditions was studied in order to provide reference for highly efficiency, low cost, large-scale production and landscape planting application.【Method】Using Lilium lancifolium, Lilium ‘Yelloween’as materials, the phenophase and the morphology were observed, curve of the measured data of plant height and bud was fitted by logistic equation and exponential equation, the growth model was constructed, meanwhile, the bud picking experience was designed, planting direction and planting density were studied to find out the growth effect of the bulb. 【Result】 The result showed that, there was a big difference between L. lancifolium and ‘Yelloween’on the phenophase. L. lancifolium bloomed later, needed higher active accumulated temperature which was 4 256℃, but ‘Yelloween’ needed only about 4 981.5℃. For L. lancifolium, the plant height equation was y=97.5949/(1+e^-(x-62.6822)/22.8819), the diameter equation was y=0.1578e^(0.0358x), the length equation was y=90.2066/(1+e^-(x-117.1807)/8.7295), which were accorded with logistic equation. For ‘Yelloween’, the plant height equation was y=70.3771/(1+e^-(x-19.1133)/9.5840), the bud’s diameter equation was y=41.2215/(1+e^-(x-65.9236)/17.1028), bud length equation was y=158.9531/(1+e^-(x-62.9011)/9.7562), which were accorded or similar with the exponential equation. The bud picking experience showed that picked the bud on the blooming day achieved the best effect on ‘Yelloween’, the average fresh weight of bulb was 89.71 g, and 18.93 cm in bulb circumference, no bud picking was the best way for L. lancifolium, with the average fresh weight of bulb was 87.59 g. Planted in NS-trending direction increased the height and steam diameter slight. The best planting spacing of ‘Yelloween’was 10 cm×20 cm, then the production was 26 936 kg per 667 m2, which was considered as the best yield, then the bulb circumference could increase by 3 grades if combined with the bud picking result.【Conclusion】Height growth regularity of the 2 lilies and the buds’ diameter growth regularity conformed to logistic curve, while the buds’ diameter regularity of ‘Yelloween’ conformed or similar to the exponential equation. No bud picking was the best for L. lancifolium,while picking buds on the blooming day was best for ‘Yelloween’, combined the appropriate planting density with NS-trending direction planting , the bulb circumference could increase by 2 to 3 grades.

Key words: lily , open cultivation , growth model , bud picking , planting density