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Evaluation of growth and yield of tropical mulberry varieties ii. yield and growth characteristics of mulberry varieties originating from indonesia taiwan and okinawa japan after two years of cultivation


Evaluation of growth and yield of tropical mulberry varieties ii. yield and growth characteristics of mulberry varieties originating from indonesia taiwan and okinawa japan after two years of cultivation



Journal of Sericultural Science of Japan 54(5): 366-373



Tropical mulberry varieties were collected and grown at the Tropical Agriculture Research Center (Ryukyu Univ.) situated in subtropical Iriomote island, to compare the growth and leaf yield under identical conditions. In this experiment, all the mulberry varieties required the application of fertilizers to achieve adequate growth and yield. Morus formosensis (Tai-Song No. 2) gave a good leaf yield, and appeared to be suitable for cultivation based on the results of silkworm rearing on this mulberry variety (Hsieh and Wu, 1977). However, it required the application of basal fertilizer and irrigation. The native M. Acidosa varieties were highly resistant to drought and strong wind. They may not be suitable as cultivated varieties but are adequate as garden mulberry varieties. M. mauticaulis which had the largest leaves with a few lateral branches, was not resitant to strong wind and the leaves were readily damaged. This variety which may be suitable as a breeding material may not be appropriate for the diet of the silkworm. M. nigra, which is wide spread in South-East Asia, had small leaves with the formation of proleptic shoots due to strong wind, and it gave a low leaf yield. This variety could be used as a grafting stock, but not as a cultivated mulberry. If training were improved, this variety could be used for rearing young silkworms. The Indonesian varieties M. lembang and M. chatayana resembled each other in their characteristics, and both varieties had light leaves, readily damaged by strong wind as the leaves were soft, which may result in increased susceptibility to diseases. From the viewpoint of yield, they may be less suitable as cultivated varieties than Tai-Song No. 2.

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