Judul: Growth of Jabon (Anthocephalus cadamba Roxb. Miq.) on PT ANTAM Unit Bisnis Pongkor’s Tailing with Top Soil and Compost Addition.
Abstrak: Tailing merupakan salah satu limbah utama yang dihasilkan pada kegiatan pertambangan emas. Tailing memiliki beberapa karakter diantaranya, kandungan bahan organik dan aktivitas mikroorganime yang rendah, rendahnya kandungan hara esensial dan KTK (kapasitas tukar kation) rendah. Karakteristik tersebut menimbulkan kendala dalam kegiatan revegetasi, sehingga perlu dilakukan perbaikan lahan sebelum dilakukan kegiatan revegetasi, salah satunya dengan cara penambahan tanah pucuk (top soil), dan kompos. Top soil dan kompos merupakan media tumbuh yang baik untuk pertumbuhan tanaman dimana keduanya mampu memperbaiki kondisi lahan yang marginal serta sebagai sumber hara dan mikroba untuk kesuburan lahan. Selain perbaikan lahan, perlu dilakukan juga pemilihan jenis pohon yang tepat. Jenis pioner mempunyai kemampuan adaptabilitas yang baik, cepat tumbuh, teknik silvikulturnya diketahui, tersedia bahan tanamannya, bersimbiosis dengan mikroba dan bersifat katalitik. Salah satu jenis yang potensial adalah jabon (Anthocephalus cadamba Roxb. Miq.). Dari hasil penelitian ini diketahui bahwa respon pertumbuhan semai jabon pada media Tailing dengan penambahan top soil dan kompos mampu meningkatkan pertumbuhan tinggi, diameter, dan biomassa akar. Hasil yang paling baik yaitu penggunaan kompos dengan dosis 20 gram yang dapat dikombinasikan dengan top soil 250 gram.
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Judul: Pertumbuhan Semai Jabon (Anthocephalus cadamba Roxb Miq) Pada Media Pasca Penambangan Batubara Yang Diperkaya Fungi Mikoriza Arbuskula, Limbah Batubara dan Pupuk NPK
Abstrak: One of the problems created by coal mining activities is the progressive increase of critical land area size and environmental damage, which are among other things in the form of worsening physical, chemical and biological properties of soils which lead to decrease of soil fertility and disturbed plant growth. Growth and nutrient absorption by Jabon seedlings have been studied in terms of their respond toward application of Arbuscular Mycorrhizal Fungi (AMF), coal waste, and soil media being used after coal mining operation. The experiment was designed as factorial completely randomized design, comprising 3 treatment factors, namely, species of AMF inoculants (control, Glomus sp., and Gigaspora sp.), growth media (control, mixture of 15% south Kalimantan coal, and mixture of 15 % Jambi coal) and concentration of NPK fertilizer (control, 2 gram/polybag, and 4 gram/polybag) with 10 replications, so that in total, there were 270 experimental units. Results showed that interaction between AMF, growth media and fertilizer had significant effects on parameters of diameter increment, shoot biomass, root biomass, total dry weight, index of planting stock quality, and percent of AMF colonization. Parameter of height increment and number of Jabon seedling leaves were affected by interaction between AMF and fertilizer. Treatment combination of AMF inoculants, coal powder, and NPK fertilizer was able to increase the concentration and absorption of nutrients N, P and K. The three treatments combination showed positive correlation between increase in concentration of nutrients N, P and K; and shoot biomass of Jabon seedlings.
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Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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