Judul: Production and Physiological Quality of Sorghum  Seeds bicolor Samurai 1 in Phase F1 with Different Harvesting Ages
Abstrak: Penelitian ini bertujuan mempelajari pengaruh umur panen terhadap mutu fisiologis dan viabilitas benih sorgum Samurai 1 pada fase F1. Penelitian dilakukan di laboratorium lapang UP3J IPB dan Laboratorium Agrostologi Fakultas Peternakan IPB University. Rancangan percobaan yang digunakan yaitu rancangan acak kelompok (RAK) dengan 5 perlakuan umur panen yaitu pada hari ke-90, 95, 100, 105, dan 110, serta 4-5 kali pengulangan. Peubah yang diamati berupa diameter batang, tinggi tanaman, berat kering biomassa malai, berat segar biomassa per ha, berat kering batang, berat kering daun, berat kering malai, berat kering daun, berat benih, jumlah benih, berat 1000 benih, dan uji viabilitas. Hasil penelitian yang didapat memberikan pengaruh nyata (P<0,05) pada produktivitasnya. Umur panen terbaik untuk mendapatkan mutu fisilogis dan viabilitas terbaik, yaitu pada perlakuan P100 dan P105, sedangkan untuk mendapatkan biomassa kering terbaik yaitu terdapat pada perlakuan P95 yaitu saat sorgum berumur 95 hari setelah tanam., This study aims to find out the effect of harvest age on the physiological quality and viability of Samurai 1 sorghum seeds in the F1 phase. The research was conducted in the field laboratory of UP3J IPB and the Agrostology Laboratory of the Faculty of Animal Science, IPB University. The experimental design used was a randomized block design (RBD) with 5 treatments at harvest age, namely on the 90th , 95th , 100th , 105th , 110th days, and 4-5 replicaty. The variables observed were stem diameter, plant height, dry weight of panicle biomass, total fresh weight, stem dry weight, leaf dry weight, panicle dry weight, leaf dry weight, seed weight, quantity of seeds, weight of 1000 seeds, and viability test. The results obtained showed a significant effect (P<0.05) in productivity. The best harvest age to get the best physiological quality and viability, at the P100 an P105 treatment, while to get the best dry biomass that is found in the P95 treatment, namely when sorghum is 95 days after planting.
Keyword: harvest age, sorghum samurai 1, viability

Judul: Effect of Harvest Ages on Production, Seeds Quality, Biomass of Sorghum of Varieties of Samurai 2
Abstrak: Tujuan dari penelitian ini adalah mengevaluasi produksi, kualitas benih, dan biomassa tanaman sorgum berdasarkan umur panen yang berbeda. Penelitian ini menggunakan tanaman sorgum varietas samurai 2 dan didesain menggunakan rancangan acak kelompok (RAK) dengan 4 perlakuan dan 5 ulangan. Data penelitian dianalisis menggunakan ANOVA, apabila berbeda nyata, dilakukan uji lanjut menggunakan uji Duncan Multiple Range Test (DMRT). Perlakuan umur panen tanaman sorgum terdiri dari 95 HST (U1), 100 HST (U2), 105 HST (U3), dan 110 HST (U4). Peubah yang diukur pada penelitian ini adalah kadar air benih, panjang malai, berat malai, berat kering malai, berat benih pipil, berat kering benih pipil, berat 1000 benih, dan viabilitas benih. Hasil penelitian menunjukkan perlakuan umur panen tanaman sorgum 105 HST signifikan meningkatkan berat benih dan berat 1000 benih. Perlakuan umur panen 105 HST juga signifikan meningkatkan viabilitas benih dan hasil terbaik pada hari ke 4 dan 7, serta biomassa produksi tertinggi., The aim of this study was to evaluate the production, seeds quality, and biomass of sorghum varieties of samurai 2 at harvest ages. This study used sorghum varieties of samurai 2 and designed a Randomized Block Design (RDB) with 4 treatments and 5 replication. The data were analyzed using ANOVA and any significant differences were further tested using Duncan Multiple Range Test (DMRT). Sorghum was harvested at the age of 95 DAH (U1), 100 DAH (U2), 105 DAH (U3), and 110 DAH (U4). The measured variable were moisture content of seed, panicle length, panicle weight, panicle dry weight, weight of pipil seed, dry weight of pipil seed, weight of 1000 seeds, and viability of seed. The results showed that the treatment of sorghum at 105 DAH significantyly increased weight of seed and weight of 1000 seeds. Furthermore, the treatment of sorghum at 105 DAH significantly increased viability of seed and get the best value of day-4 and day-7, and highest of biomassa production.
Keyword: harvest age, panicle, seed, sorghum, viability

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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