Growth Variation of Ebony (Diospyros Pilosanthera Blanco.) for 2 Years Old in Arboretum of Manado Forestry Research Institute

Abstract

One commercial tropical species in North Sulawesiis ebony (Diospyrospilosanthera Blanco). This species is called Boniok by local people in Bolaang Mongondow. This species has wide distribution in Southeast Asiain cluding Indo-China, Burma, Thailand, PeninsularMalaysia, Sumatra, Java, Borneo(Sarawak, Brunei, Sabah, West, Central and East Kalimantan), Philippines, Celebes, the Moluccas and New Guinea. This species isone of commercial timber that has been exploited since long timeago and not equal to their natural regeneration, thus, causing their population decrease and are rarely found in the forest in North Sulawesi Province and Gorontalo Province. Nowadays, information about the number of their population in North Sulawesi Province and Gorontalo Province are not available. One of efforts to save this species is by doing exitu conservation. This studyaims to determine the growth of exitu conservation plant of ebony(D. pilosanthera) at 2 years old in Arboretum of Manado Forestry Research Institute. This study was done by randomized block design using 5 replications. Each replication consisted of 10 individuals and the number of samples used were 50 individuals. Spacing used is 3mx 3m. Treatment applied was dosage of fertilizes using Nitrogen, Phosphate and Kalium (NPK). Replication of treatments consists of 5 group i.e group 1(A0) was using 100gr/plant, group 2(A1) 200 gr/plant, group 3(A2) 300gr/plant, group 4 (A3) 400gr/plant and groups 5(A4) 500gr/plant. The results showed that their life percentage rate in 2years were 98.00%. The life percentage of ebony(D. pilosanthera) was high and indicates that these plants canada ptand grow wellout of their naturalhabit at. The results showed that statistical analysis at 95% interval confidence indicates that there is no significant difference between the treat mentsused in this research and the growth of its height and diameter. Otherwise, there is no significant difference betwen treatments, but they have difference growth permormance, while the best growth of height was shown by treatment A1 (200 gr/plant) with the average of 3.350 m and the lowest was shown by treatment A0(100gr/plant) with average height of 2.913m.The best diameter growth was shown by treatment A4(500gr/plant) with average 3.840 cm and the lowest was shown by treatment A0(100gr/plant) with average 2.933cm. These results indicate that increasing fertilizer dosage had no effect on height growth of young plants of ebony(D. pilosanthera) at 2 years old in Arboretum of Manado Forestry Research Institute, but had effects ondiameter growth, although not significant between group of treatments.