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: Growth, Seed Production and Quality of Sorghum bicolor cv. Samurai 1 at Different Harvest Ages
Abstrak: Penelitian ini dilaksanakan di Unit Pendidikan dan Penelitian Peternakan Jonggol, Institut Pertanian Bogor. Rancangan percobaan menggunakan Rancangan Acak Kelompok (RAK) dengan 5 perlakuan yaitu P90, P95, P100, P105, P110 dan 5 ulangan. Peubah yang diamati dalam penelitian ini adalah tinggi tanaman, diameter batang, biomassa berat kering, berat kering daun, berat kering malai, berat kering batang, biomassa malai kering, rataan jumlah benih kering per malai, berat benih pipil kering, berat 1000 benih kering, produksi benih kering per ha dan viabilitas. Hasil penelitian menunjukan umur tanaman tidak mempengaruhi (P>0,05) tinggi tanaman,tetapi umur tanaman mempengaruhi (P<0,05) diameter batang berbeda nyata, berat kering tanaman, berat kering tanaman, biomassa kering malai, rataan jumlah benih kering, berat benih pipil kering, berat 1000 benih kering, produksi benih per ha dan viabilitas berbeda sangat nyata (P<0,01). Produksi benih tertinggi diperoleh pada perlakuan umur 110 hari yakni biomassa malai kering 3,01 kg, rataan jumlah benih kering 1874, berat benih pipil 47,2 g, berat 1000 benih yaitu 26 g, produksi benih per ha 8610,49 kg ha-1dan viabilitas 70,8%., The study was conducted at the Jonggol Animal Husbandry Education and Research Unit, Bogor Agricultural University. The experimental design used was Randomized Block Design (RDB) with 5 treatments including P90, P95, P100, P105, P110 and 5 replications. The variables observed in this study were plant height, stem diameter, dry weight biomass, leaf dry weight, panicle dry weight, stem dry weight, dry panicle biomass, average number of dry seeds per panicle, dry seed weight of dry shells, weight of 1000 dry seeds, dry seed production per ha and viability. The results showed that plant height was not significantly influenced by harvest age, while thw harvest age affected stem diameter (P<0,05) and plant dry weight biomass, leaf dry weight, panicle dry weight, stem dry weight, panicle dry biomass, average number of dry seeds, seed shed weight. dry weight, 1000 dry seed weight, seed production per ha and viability were significantly different (P<0.01). The best performance of experimental plants including were dry panicle biomass 3.01 kg, the average number of dry seeds was 1874, the seed weight was 47.2 g, the weight of 1000 seeds was 26 g, seed production per ha was 8610.49 kg ha-1 and viability was 70, 8% were obtained from plantes harvested at 110 days.
Keyword: Seed production, sorghum samurai 1, viability

Judul: Ongkos irregularitas sebuah graf
Abstrak: Tulisan ini mengkaji bagaimana cara mcngubah sualu graf menjadi graf yang irregular, yaitu dengan menambahkan beberapa edge pacta graf asal. Untuk sebuah graf G, didefinisikan ongkos irregularitas ic(G) yaitu jumlah minimum tambahan edge sedemikian sehingga menjadi Multigraf H yang merupakan multigraf G irregular. Akan ditentukan ongkos irregularitas dari graf regular, graf mendekati regular, dan graf mendekati irregular.
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