Judul: Adaptation of Eucalyptus pellita F. Muell seedling from several seed sources for condition of drought stress in nursery
Abstrak: Salah satu faktor pembatas rendahnya keberhasilan di dalam rehabilitasi lahan kritis kering adalah cekaman kekeringan. Rendahnya keberhasilan tersebut, diperparah lagi dengan adanya pemanasan global yang mengakibatkan tidak menentunya batas antara musim penghujan dan musim kemarau. E. pellita merupakan salah satu jenis cepat tumbuh yang multi manfaat dan cocok digunakan sebagai salah satu jenis pilihan dalam rehabilitasi lahan kritis. Sumber benih yang unggul dan pemanfaatan mikoriza merupakan salah satu alternatif untuk meningkatkan keberhasilan rehabilitasi lahan tersebut. Penelitian ini bertujuan untuk mendapatkan informasi asal sumber benih E. pellita yang adaptif terhadap cekaman kekeringan, mengkaji mekanisme adaptasi bibit tanaman E. pellita dari 10 kelompok sumber benih unggul yang telah dibangun, dan mengetahui peranan mikoriza arbuskula dalam mengatasi cekaman kekeringan.
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Judul: Pengaruh Media semai Terhadap Pertumbuhan Pelita (Eucalyptus pellita F.Muell)
Abstrak: INTRODUCTION. Forest is one of the natural resources which give a lot of benefit for human welfare. Development of plantation forest is expected to serve as substitute for natural forest in supplying wood. Eucalyptus pellita is one of the fast growing-species which has a potential to be developed in plantation forest. Plantation forest always involves the activity of nursery. The use of top soil as growing media in nursery causes soil degradation in the area where the top soil is collected. The objective of this research was learning the effect of various nursery media (as substitutes for soil) on the growth of Eucalyptus pellita seedling. MATERIALS AND METHOD. Materials used in this research were Eucalyptus pellita seed, top soil, sheep manure, compost, rice husk, polybag, cocopeat, peat moss, vermiculite, sawdust, attachment label, and germination box. Experimental design in this research was Randomized Complete Block Design. There were 20 kinds of nursery media (treatments) in this study. Each treatment had 4 replications (blocks). Each treatment in each block comprised 5 polybags. Every polybag was filled with one plant of Eucalyptus pellita. Total number of polybag used was 400 polybags. The variables observed were seedling height (cm), number of leaves (which were measured once a week) and seedling diameter (cm) in the end of experiment period. RESULTS AND DISCUSSION. Application of top soil and sheep manure with volume ratio of 2:1 (M5) produced the highest height growth. Media (cocopeat, peat moss, vermiculite =2:2:1) and sheep manure with volume ratio of 2:1 (M20) showed highest diameter growth. Media of cocopeat and compost with volume ratio of 2:1 (M8) showed the greatest increase in number of leaves. Media of (cocopeat, peat moss, vermiculite =2:2:1) and sheep manure with volume ratio of 1:1 (M19) produced the smallest height / diameter ratio.
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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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