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: Production and Seed Quality of Sorghum (Sorghum bicolor (L.) Moench) Samurai 1 Varieties with Different Harvesting Ages during The Rainy Season.
Abstrak: Penentuan umur panen yang tepat serta penggunaan benih bermutu erat hubungannya terhadap produksi tanaman sebagai pakan ternak. Penelitian ini bertujuan mengevaluasi kemampuan produksi dan viabilitas tanaman sorgum (Sorghum bicolor (L.) Moench) varietas Samurai 1 sebagai pakan ternak pada umur panen yang berbeda pada musim hujan. Rancangan acak kelompok digunakan pada 3 perlakuan umur panen, dengan 3 kelompok terhadap hasil pertumbuhan dan produktivitasnya. Rancangan acak lengkap digunakan pada 3 perlakuan umur panen, dengan 4 ulangan terhadap viabilitas benih. Perlakuan umur panen yaitu hari ke-100, 105 dan 110 hari. Hasil menunjukkan perlakuan tidak berbeda nyata terhadap tinggi tanaman, jumlah daun, diameter batang, berat segar biomassa, berat kering daun, berat kering batang, berat kering malai utuh, berat kering total jerami sorgum, berat kering brangkasan malai, berat kering biomassa malai, berat benih pipil kering, rataan jumlah benih kering, produksi benih kering, tetapi berbeda nyata terhadap berat 1000 benih kering dan viabilitas benih sorgum varietas Samurai 1. Umur panen 105 hari memberikan hasil terbaik untuk mendapatkan produksi biomassa dan kualitas benih tanaman., The determination of the right harvest age and the use of quality seeds are closely related to crop production as animal feed. This study aimed to evaluate the seed production and viability of sorghum (Sorghum bicolor (L.) Moench) Samurai 1 variety at different harvesting ages during rainy season. Randomized block design was used for 3 treatments of different harvesting age, with 3 blocks as replicants for growth yield and productivity. Completely randomized design was used for 3 treatments of harvesting age, with 4 replicates for seed viability. The harvest age was the 100th, 105th, and 110th days. The results showed that the treatments did not significantly affect plant height, number of leaves, stem diameter, total biomass, dry weight of leaves, dry weight of stems, dry weight of intact panicles, total weight of sorghum straw, dry weight of stover panicle, dry weight of panicle biomass, dry seed weight, average number of dry seeds, and dry seed production, but significantly affected the 1000 dry seed weight and viability of Samurai 1 sorghum seed. Harvesting at 105 days resulted in the best results for biomass production and seed quality
Keyword: production, sorghum, harvest age, 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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