Yokoi, MASATO

As the need is felt for the rapid propagation of high-quality lily bulbs, these experiments were undertaken to study some factors affecting the bulblet production in the scale propagation from 1956 to 1958. Factors tested were as follows: (I) The relationship of scale position in the parent-bulb to the bulblet formation: Rapid and good production of bulblets on scales from the outer and middle parts of parent-bulb was obtained. (II) The effect of the harvest time of parent-bulb and scaling time: Earlier harvest (Aug. 10) and scaling were favourable for producing much larger bulblets. (III) The effect of scaling media: Bulblet and root formation of scales taken in the media, Andosub-soil, Kanuma-soil, and river sand, were faster and larger than those taken in the vermiculite and sawdust. (IV) The effect of temperature and soil moisture: Temperature (15-25℃) and soil moisture (30-60%) favoured bulblet formation on the scales depending on the verieties used. (V) The effect of low temperature treatments of parent-bulbs: Storage of bulbs of Lilium speciosum at 0℃ for 15, 30, and 45 days were effective in stimulating the top growth. Treatments on L. maculatum var. spontaneum had little effect on the top growth but on L. longiflorum they had no effect. (VI) The effect of scale treatments: For the purpose of increasing the number of bulblets pre scale, scales were cut longitudinally or horizontally. No evident influence of treatments on the bulbletforming position on the scales, and number and size of bulblets were noted. Cutting scales longitudinally were somewhat beneficial for increasing yields. (VII) The effect of gibberellin treatments: The inhibiting effect on the bulblet and root formation was found by the applications of gibberelllins (50, 100 ppm).