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: Pertumbuhan Bibit Mahoni (Swietenia macrophylla King.) pada Media Tanam dan Intensitas Naungan yang Berbeda
Abstrak: Swietenia macrophylla King. berpotensi di bidang ekonomi, kesehatan dan lingkungan, sehingga pohon ini salah satu spesies yang digunakan untuk rehabilitasi hutan. Pertumbuhan S. macrophylla dipengaruhi oleh faktor lingkungan, di antaranya kualitas media tumbuh serta intensitas naungan. Penelitian ini bertujuan untuk mendapatkan media tanam dan naungan yang tepat untuk pertumbuhan benih S. macrophylla. Penelitian ini dilaksanakan dengan menggunakan rancangan petak terbagi dengan acak kelompok. Petak utama adalah naungan menggunakan paranet yang terdiri atas 2 taraf, sedangkan anak petak adalah media tanam yang terdiri atas 5 taraf. Hasil penelitian menunjukkan adanya interaksi perlakuan media tanah mineral tanpa naungan menghasilkan tinggi tanaman dan bobot basah total tertinggi pada bibit mahoni. Perlakuan media tanah mineral dan arang sekam menghasilkan pertumbuhan terbaik pada diameter batang, jumlah dan luas daun, jumlah akar, bobot kering total dan indeks mutu bibit mahoni. Perlakuan tanpa naungan menghasilkan pertumbuhan terbaik pada diameter batang, jumlah dan luas daun, jumlah dan panjang akar, bobot kering total dan indeks mutu bibit mahoni pada umur 9 minggu setelah tanam, Swietenia macrophylla has potential in the economic, health and environmental sectors; so this tree is one of the species used for forest rehabilitation. The growth of S. macrophylla is influenced by environmental factors, including the quality of the growing media and shade intensity. This study aimed to obtain the right planting medium and shade for the growth of S. macrophylla seedlings. This research was conducted using a split-plot design with randomized groups. The main plot was shade using paranet which consists of 2 levels, while the subplot was the planting medium which consists of 5 levels. The results showed that the interaction of mineral soil media treatment without shade resulted in the highest plant height and total wet weight in mahogany seedlings. Treatment of mineral soil media and husk charcoal produced the best growth in stem diameter, number and area of leaves, number of roots, total dry weight and quality index of mahogany seedlings. Treatment without shade produced the best growth in stem diameter, number and area of leaves, number and length of roots, total dry weight and quality index of mahogany seedlings at the age of 9 weeks after planting
Keyword: intensitas naungan, media tanam, Swietenia macrophylla King.

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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