The quality and quantity of feed silkworm affect the yield and quality of cocoon. Crossing among mulberry species was conducted in order to obtain new hybrids with higher productivity. This study aimed to select mulberry hybrid for highland cultivation purpose. Survival rate, length of branches, number of branches, and weight of wet leaves were measured to determine the productivity of five mulberry hybrids. Mulberry hybrids x Morus cathayana M. amakusaguwa M. cathayana M. amakusaguwa IV.10 and x IV.12 are selected hybrids for highland cultivation. Both hybrids produced leaves production increment by 158% and 145% compared to M. cathayana as control.
This study was conducted to observe growth variation and genetic parameters of progeny test of teak (Tectona grandis Linn. F) in Gunung Kidul at 5 years of age. The progeny test of teak was laid-out in a randomized complete block design consisting of 120 families, 6 blocks, 3 tree-plots. Measurement was conducted annually for traits tree height, dbh, stem straightness, branching type and individual tree volume. The results of study showed that the mean of survival rate reached 84.72%, which was varied from 55.56 to 100%. Among tested families and populations, all measurement traits showed significant differences. The average of growth traits werw 5.86 m for tree height, 5.69 cm for dbh and 0.015 m3 for individual stem volume. In case of form traits, the average were 2.12 for stem straightness and 1.90 for branching type. Estimated family heritability were 0.166 for tree height, 0.202 for dbh, 0.245 for stem straightness, 0.140 for the branching type and 0.289 for individual stem volume.
One of the problems faced by silk production in Indonesia is low productivity of mulberry that is currently planted by the farmers. Therefore, it is necessary to develop new hybrid of mulberries that have a higher leaves production. Before the new hybrid of mulberry can be cultivated by farmers, the new hybrid plant should be tested first. Adaptation test is required to view genetic response of the plant with the environment in which mulberry grows. The purpose of this study is conducting adaptation test of mulberry's five types new hybrid to measure the growth and the productivity of plants. Adaptation test research of mulberry's five new hybrids has been conducted from 2012 until 2014 in Cipeuteuy Village, Sub District Kabandungan, District of Sukabumi. This research used randomized block design method with six treatments and three replications. The results showed that two types of hybrid mulberry showed high percentage growth on average 99%. The use of hybrid mulberry Morus cathayana x Morus amakusaguwa IV.12 in natural silk production can increase 59,60 % of productivity, while Morus cathayana x Morus amakusaguwa IV.10 can increase 47,83% of productivity. Two types of hybrid mulberry, Morus cathayana x Morus amakusaguwa IV.12 and Morus cathayana x Morus amakusaguwa IV.10 have excellent potential in silkworm feed productivity development.
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