Judul: Physiological Analysis of Shoot Cuttings in Propagation of Eucalyptus pellita F. Muell without Hormone
Abstrak: Jenis tanaman yang umum digunakan di Hutan Tanaman Industri (HTI) sebagai bahan baku pulp dan kertas adalah Eucalyptus pellita. Bibit berkualitas E. pellita dapat diproduksi dari klon unggul dengan perbanyakan secara vegetatif, yakni stek pucuk (tunas). Perbanyakan tanaman melalui stek pada umumnya menggunakan hormon untuk membantu proses terbentuknya akar, namun beberapa klon E. pellita ada yang mudah berakar tanpa bantuan hormon. Oleh karena itu perlu dilakukan penelitian analisis fisiologi stek pucuk E. pellita (klon 148) tanpa menggunakan hormon. Desain penelitian yang digunakan adalah Rancangan Acak Lengkap dengan lima perlakuan yakni umur tunas 30, 27, 24, 21, dan 18 hari dengan 5 ulangan. Hasil analisis fisiologi stek pucuk E. pellita yakni kandungan hormon IAA, C-organik, dan N menunjukkan hasil yang tidak linear dengan perlakuan umur tunas. Hasil pengukuran panjang tunas, jumlah node, dan jarak antar node menunjukkan nilai yang linear dengan perlakuan umur tunas. Hasil pengamatan total hidup (survival rate), total berakar, dan bertunas menunjukkan perlakuan umur tunas 18 hari memiliki nilai terendah dibandingkan perlakuan lain. Berdasarkan hasil pengukuran tinggi dan diameter umur 12 MST menunjukkan perlakuan tunas umur 21 hari memiliki pertumbuhan dan survival rate terbaik sehingga dapat menjadi dasar penentuan umur tunas dalam produksi bibit klon 148 skala operasional. Kata kunci: Eucalyptus pellita, fisiologi, perbanyakan, hormon, Eucalyptus pellita is extensively utilized in Industrial Plantation Forests (HTI) as a primary source for pulp and paper production. High-quality seedlings of E. pellita can be produced from superior clones through vegetative propagation, particularly using shoot cuttings. Although hormonal treatments are commonly applied to facilitate rooting, some E. pellita clones can root effectively without them. This study examines the physiological characteristics of E. pellita shoot cuttings (clone 148) without hormone application. The research employed a Completely Randomized Design with treatments corresponding to shoot ages of 30, 27, 24, 21, and 18 days, each replicated five times. Results showed non-linear relationships between shoot age and the levels of IAA hormone, organic carbon, and nitrogen. However, shoot length, number of nodes, and internode distance exhibited linear relationships with shoot age. The 18-day shoot treatment had the lowest survival rate, rooting, and sprouting. Measurements at 12 weeks post-planting indicated that 21-day-old shoots demonstrated superior growth and survival rates. These findings suggest that 21-day-old shoots are optimal for the operational-scale production of clone 148 seedlings. Key words: Eucalyptus pellita, hormones, physiology, propagation
Keyword: Eucalyptus, Stek, fisiologi, hormon, perbanyakan

Judul: Manajemen Tempat Tumbuh Tanaman Eucalyptus pellita di PT Perawang Sukses Perkasa Industri, Riau
Abstrak: Eucalyptus sp. is one of the species which be developed in the management of wood fiber plantation. Wood fiber for pulp and paper is important, so need to known the management of site to obtain the optimal growth of Eucalyptus pellita at PT Perawang Sukses Perkasa Industri (PSPI). This research intended to observe fertilization management and maintenance management at PT PSPI. This research used Forest Health Monitoring (FHM) method to take data of plant growth. The cluster had 4 plot Iike circle. The sample was E. pellita 1-4 years. Fertilization management at PT PSPI were basic fertilizer (CIRP/Cristmast Island Rock Phosphate and NPK) and supplementary fertilizer (NPK-1, NPK2, NPK-3). Maintenance Management at PT PSPI were ring weeding, sport spray of herbicide and slash. Maintenancing and fertilizing were given to the plot according to the environmental conditions and the age factor. The best growth increment was in plot P2. P2 had 4.14 diameter increment and 5.72 height increment.
Keyword: fertilization management, maintenance management, site management, industrial forest, Forest Health Monitoring, Eucalyptus pellita

Judul: Grup dan Homomorfisma Grup pada Rubik Revenge
Abstrak: Rubik cube is a kind of puzzle game. A player must arrange rubik sides, which have been disordered, back to the position where every side has the same colour. This paper does not focus on the settlement solution, but instead on proving the existence of a group homomorphism between rubik movement group and S96 symmetric permutation group in rubik revenge. Firstly, it has been proved that rubik movement set is a group. Then, it also has been proved that the M set, which contains numeric labels of 1 until 96 in cubinos sides, is S96 symmetric permutation group.
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