Meranti (Shorea macrophylla), damar (Agathis Dammara) and gaharu (Aquilaria malacensis) cultivation on rubber plantation sidelines has been carried out by members of Kelompok Swadaya Masyarakat (KSM) Mitra Lestari and KSM Bagunda Lestari as a partner of Forum DAS Wampu, District Bahorok. This study aimed to measure the growth (diameter and height) of meranti, damar, and gaharu as well as to determine the effect of tree planting on the production of latex from rubber trees that have been aged over 20 years. Meranti was planted in 2006 (in 1 hectare rubber plantation), damar was planted in 2007 (in 1 hectare rubber plantation), and gaharu was planted in 2008 (in 0.8 hectares rubber plantation). The results showed that diameter growth for meranti was ranging from 13 to 15 cm, damar was ranging from 11.5 to 12.5 cm, and gaharu was ranging from 2.5 to 3.5 cm. For height, meranti was ranging from 15-20 m, damar 8-10 m, and gaharu 2-3 m. The analysis showed that the trees was planted on rubber plantation sidelines with a spacing of 3x5 meters, did not decrease the production of latex from rubber trees that have been aged over 20 years. Efforts to maximize the utilization of a rubber plantation in District Bahorok have an important role in conservation of natural resources and environmental, in respect of this area is a buffer zone of Gunung Leuser National Park (TNGL).

Keyword: sidelines, rubber, plantation, Gunung Leuser National Park (TNGL).

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