Judul: Aplikasi Teknologi Sonic Bloom dan Pupuk Daun untuk Memacu Pertumbuhan Bibit Mahoni (Swietenia Macrophylla King.)
Abstrak: Photosynthesis is a process to produce useful carbohydrates for nutritional reserve, carbon structure, energy and plant metabolisme processes in plant growth. Factor affecting photosynthesis are the supply of CO2, H2O, nutrients and stomata opening mechanism. Meanwhile, light energy and temperature are external factors that support photosynthesis. To improve the result of photosynthesis process, the supplies of CO2,H2O, and nutrients are also increased as well. The opening stomata widely and in longer time are affected by vibration and duration of sun exposure. One of functions of carbohydrates as product of photosynthesis process is used to support carbon structure, which is important for plant growth and development. This study was aimed to asses the effectiveness of foliar fertilizers and the application of sonic bloom technology to increase the growth of mahogany seedlings. Research design in this experiment was completely randomized factorial design. The result of this research showed that sonic bloom (S1) and 10 gram/liter of foliar fertilizers A or gandasil B (P2) produced the best quality seedling with index seedling value 30 and 24 points, while the interaction of sonic bloom and 5 gram/liter of leave fertilizers A (S1P1) produced quality seedling in the best value with seedling index value 29 points, followed by SIP2 interaction with the seedling index value 23 points.
Keyword: sonic bloom, foliar fertiliziers, growth, mahogany, Photoshyntesis

Judul: Respons Pertumbuhan Mahoni terhadap Pemberian Arang Sekam, Kompos, dan NPK di Taman Hutan Kampus IPB
Abstrak: Lahan Kelompok Tani Hutan Kemang Sawargi yang terletak di Taman Hutan Kampus IPB memiliki kondisi tanah dengan kesuburan yang rendah. Kesuksesan penanaman dipengaruhi oleh kesuburan tanah yang baik serta pemilihan jenis yang tepat. Mahoni dipilih karena adaptif dan mampu hidup pada berbagai kondisi. Kemampuan pertumbuhan mahoni di lapangan dapat ditingkatkan dengan memberikan arang sekam, kompos, dan NPK. Penelitian ini bertujuan mengetahui respons pertumbuhan terhadap pemberian arang sekam, kompos, NPK, dan kombinasinya di lapangan. Interaksi perlakuan arang sekam, kompos, dan NPK memberikan pengaruh nyata terhadap pertambahan tinggi, jumlah akar, dan panjang akar mahoni. Faktor tunggal kompos memberikan pengaruh yang sangat nyata terhadap pertambahan tinggi, jumlah akar dan panjang akar mahoni. Pemberian kompos tanpa arang sekam dan NPK memberikan hasil terbaik bagi pertumbuhan parameter mahoni berupa tinggi, jumlah akar dan panjang akar., The land of Kelompok Tani Hutan Kemang Sawargi located in Taman Hutan Kampus IPB has soil conditions with low fertility. The success of planting is influenced by good soil fertility and the selection of the right type. Mahogany was chosen because it is adaptive and able to withstand various conditions. Mahogany growth ability in the field can be increased by providing husk charcoal, compost, and NPK. This study aims to determine the growth response to the provision of husk charcoal, compost, NPK, and their combination in the field. The interaction of husk charcoal, compost, and NPK treatments had a significant effect on the increase in height, number of roots, and root length of mahogany. The single factor of compost had a very significant effect on the increase in height, number of roots, and root length of mahogany. Provision of compost without husk charcoal and NPK gave the best results for the growth of mahogany parameters in the form of height, number of roots, and root length.
Keyword: compost, growth, husk charcoal, mahogany, NPK

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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