Judul: Pemanfaatan cendawan mikoriza arbuskula dan kompos aktif untuk meningkatkan pertumbuhan semai mindi (Melia azedarach LINN) pada Media Tailing Tambang Emas Pongkor
Abstrak: The objectives of this research was to determine the effect of arbuscula mycorrhiza (AM) fungi and activated compost on Melia azedarach seedling grown on tailing media without sterilisation. Three factors complete randomised experimental design was conducted under green house conditions and DMR Test was used to analyse of the effect of tailing, compost and kinds of AM treatment. Percent of AM colonization, spore number, plant growth and nutrient uptake were measured in this experiment
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Judul: Pemanfaatan Mycorrhizal Helper Bacteria (MHBs) dan Fungi Mikoriza Arbuskula (FMA) untuk Meningkatkan Pertumbuhan Semai Gmelina (Gmelina arborea Roxb.)
Abstrak: INTRODUCTION. Increase in the size of human population causes an ever increasing demand on paper produtcs. Therefore, there is a need to supply wood as raw materials in rapid manner. In relation with this, the Indonesian government has a policy to develop Industrial Plantation Forest (HTI). Gmelina is one of the forest tree species which has good prospect to be developed in Industrial Plantation Forest (HTI). This species is a fast growing species which could grow in various types of soil, and its wood is considerably useful. Development ofHTI in Indonesia is emphasized on critical land. The use of Arbuscular Mycorrhizal Fungi (AM F) is an appropriate solution for promoting plant growth in such condition. In the field, AMF had some constraints in creating symbiosis with host plants, Therefore, in this case, there is a need for bacteria which stimulates the AMF. One such bacteria, is known with the name Mycorrhizal Helper Bacteria (MHBs). MATERIALS AND METHOD. This research used Factorial Completely Randomized Design comprising 16 treatments, 5 replications and 3 units. Inoculation of mycorrhizal fungi and bacteria was conducted when the seedlings were 3 weeks old. Afterwards, observation was conducted for 3 months. For observing the plant's respond toward treatments, the observed parameters were among other things: height, diameter, root biomass, shoot biomass, shoot - root ratio, Index of Seedling Quality, and percentage of mycorrhizal infection. RESULTS AND CONCLUSION. Results of Analysis of Variance showed that mycorrhizal treatment had significant effect on parameters of root biomass and percentage of mycorrhizal infection. On the other hand, combined treatments of mycorrhiza and bacteria had significant effect toward parameter of root biomass. Combination of mycorrhiza with isolate BGLo3 gave the highest percentage of mycorrhizal infection, namely 25.49 %. Inoculation of isolate BGLo1 gave the best respond for parameters of height and diameter. Consecutively, the exhibited increases were 32.33 % and 31.25 % as compared with those of control. Combination of mycorrhiza with BGLo3 also exhibited the highest increase as compared with control, in terms of parameters of root biomass and Index of Seedling Quality, namely 2.28 % and 87.89 %. Inoculation ofmycorrhiza without bacteria exhibited the best respond for parameters of shoot - root ratio, namely with increase by 9.23 % as compared to control.
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Judul: Karakteristik Bifurkasi Persamaan Schoedinger Nonlinier Kuintik Menggunakan Pendekatan Dinamika Sistem
Abstrak: Soliton merupakan gelombang soliter yang dapat mempertahankan bentuknya saat menjalar pada kecepatan konstan. Jika sebuah gelombang soliton berinteraksi dengan gelombang soliton yang lain maka keduanya akan mempertahankan profilnya masing-masing. Pada penelitian ini soliton diwakili oleh persamaan Scroedinger nonlinier kuintik (QNLS). Melalui pendekatan dinamika sistem akan digambarkan karakteristik bifurkasi persamaan QNLS. Dari hasil perhitungan diperoleh 3 titik kritis untuk (U1, U2) yaitu (-(k/σ) 1 4, 0); (0, 0); ((k/σ) 1 4, 0) harga eigen λ1,2 = ±2(k/β) 1 2 , λ1,2 = ±(-k/β) 1 2 , λ1,2 = ±2(k/β) 1 2 berturutturut untuk masing-masing titik kritis. Ketika k > 0 dan β > 0 atau k < 0 dan β < 0 diperoleh jenis titik kritis sadel, senter, sadel untuk masing-masing titik kritis. Sedangkan ketika k > 0 dan β < 0 atau k < 0 dan β > 0 diperoleh jenis titik kritis senter, sadel, senter untuk masing-masing titik kritis. Hasil ini metunjukkan bahwa sistem tidak mengalami perubahan titik kritis tetapi mengalami perubahan kestabilan pada bifurkasi persamaan QNLS.
Keyword: soliton, quintic nonlinier Schroedinger (QNLS) equation, system dynamics, bifurcation, critical points