Judul: After-ripening period and responses to seed dormancy-breaking treatments in brown rice and hybrid rice (Oryza sativa L)
Abstrak: Randomized block design was used in this research with two factors i.e after-ripening period (1-9 week) and breaking dormancy treatments i.e untreated control, soaking in water 24 h and soaking in 3% KNO3 for 24 h. The objective of this research were: 1) to study after-ripening period of brown rice and hybrid rice; 2) to find out effective methods for breaking seed dormancy. The seven varieties choosen and dried below to 14% moisture content. Persistance of seed dormancy in each cultivar was determined based on the time needed to reach a minimum of 80% germination capacity. The results of the experiment showed that viability and vigor of brown rice and hybrid rice seed were increased in line with after-ripening period. After-ripening period was different in each variety i.e 4 weeks in Aek Sibundong, SL-8 and Bernas Rokan; 7 weeks in Bah Butong, Lokal Batang and Bernas Prima; and 9 weeks in TEJ. Soaking in 3% KNO3 for 24 h was the most effective method for breaking dormancy of Aek Sibundong, Bah Butong, Lokal Batang, TEJ, SL-8 and Bernas Rokan, except Bernas Prima, none of the methods were effective.
Keyword: 

Judul: Response of Various Groundnut Varieties (Arachis hypogaea L.) to After-ripening Period and Breaking Seed Dormancy Treatment
Abstrak: Penelitian ini bertujuan untuk mempelajari respon beberapa varietas kacang tanah (Arachis hypogaea L.) terhadap perlakuan pematahan dormansi selama periode 6 minggu after-ripening, dan mendapatkan metode pematahan dormansi yang efektif. Percobaan ini dilaksanakan di Laboratorium Ilmu dan Teknologi Benih, Departemen Agronomi dan Hortikultura, IPB mulai November 2021 sampai Maret 2022. Terdapat dua percobaan dengan Rancangan Acak Lengkap menggunakan rancangan lingkungan Rancangan Petak Terbagi (Split Plot Design). Percobaan 1 menggunakan sembilan varietas (Hypoma 1, Takar 2, Tuban, Kancil, Kelinci, Pelanduk, Garuda, Zebra, Gajah) sebagai petak utama, dan periode after ripening sebagai anak petak. Setelah panen benih dikeringkan hingga mencapai kadar air 7–14 %, disimpan dalam kemasan plastik pada suhu rata-rata 28 °C selama 0, 2, 4, dan 6 minggu (periode after-ripening). Percobaan 2 menggunakan sembilan varietas (sama seperti percobaan 1) sebagai petak utama, dan perlakuan pematahan dormansi sebagai anak petak. Perlakuan pematahan dormansi terdiri atas kontrol (tanpa perlakuan), pelembapan awal substrat pengecambahan dengan KNO3 0,2%, dan pemanasan benih pada suhu 40 °C selama 72 jam. Selama periode 6 minggu after-ripening benih kacang tanah semua varietas belum mengalami patah dormansi. Perlakuan pemanasan benih pada suhu 40 °C selama 72 jam saat 6 minggu after ripening merupakan metode paling efektif mematahkan dormansi benih kacang tanah varietas Kancil, Kelinci, Zebra dan Gajah., This research aimed to study the responses of several peanut (Arachis hypogaea L.) cultivars to the treatment of breaking dormancy up to 6 weeks after ripening and find an effective method of breaking dormancy. The experiment was conducted at IPB Seed Storage and Seed Quality Testing Laboratory from November 2021 until March 2022. Two experiments were arranged in a Completely Randomized Design with a Split Plot environmental design. Experiment 1 used nine varieties (Hypoma 1, Takar 2, Tuban, Kancil, Kelinci, Pelanduk, Garuda, Zebra, and Gajah) as the main plot and the after-ripening period as sub-plots. After harvesting, the seeds were dried to a moisture content of 7–14% and stored in plastic packaging at an average temperature of 28 °C for 0, 2, 4, and 6 weeks (after-ripening period). Experiment 2 used nine varieties (same as experiment 1) as the main plot and the treatment of breaking dormancy as sub-plots. The dormancy-breaking treatments consisted of control (without treatment), moistening the germination substrate initially with 0.2% KNO3, and heating the seeds at 40 °C for 72 hours. During the 6-weeks after the ripening of peanut seeds, all varieties have not broken dormancy. Dormancy breaking treatment by heating seeds at 40 °C for 72 hours 6 weeks after-ripening was the most effective method of breaking the dormancy of peanut seeds cv. Kancil, Kelinci, Zebra and Gajah.
Keyword: germination, heating 40 °C, KNO3, peanut seed dormancy

Judul: Penyelesaian Masalah Pelabelan Graf vertex Magic pada Graf Cycle Sederhana
Abstrak: Graf vertex magic adalah suatu graf memiliki nilai bilangan magic yang sama pada masing-masing vertex yang berbeda. Graf cycle sederhana adalah suatu walk tertutup yang mengandung setidaknya tiga vertex, semua vertex-nya berbeda dan setiap vertex terhubungkan oleh satu edge.
Keyword: