Judul: Seed Invigoration treatments to increase seed viability, plant growth and yield of upland rice (Oryza sativa L.)
Abstrak: The objective of this research was to study the effects of invigoration treatments, seeds viability and varieties on seed vigor, plant growth and yield of upland rice (Oryza sativa L.). The research was carried out in the seed Science and Technology Laboratory, Bogor Agricultural University, and the Makariki field station, Central of Maluku District, Acessement Institute of Agricultural Technology Maluku. The research consisted of Laboratory and field experiments, both were arranged in a Randomized block design with three treatment factors, invigoration, viabilities, and varieties, and three replications. The result showed that the invigoration treatment with GA3 and young coconut water increased seed viability from 58.0-61.3 to 85.3-96.7% and vigor index from 19.1-44.9 to 42.5- 89.2%. The treatment also improved plant performance in the field indicated by more plants and higher grain yield of the treated plots than those of the untreated. There were 234.9-245.1 plants/plot yielded 4.96-6.22 t/ha, in the treated plots compared to 205.9-213.3 plants/plot yielded 3.41-3.83 t/ha in the untreated plots.
Keyword: 

Judul: Pengaruh perlakuan invigorasi terhadap viabilitas benih dan hasil padi (Oryza sativa L.)
Abstrak: Seed quality with high viability and vigor is an important factor to get high yield of rice. A research was conducted from April to August 2011 aimed to study the effects of invigoration treatments on seed viability and yield of rice (Oryza sativa L.). The research consisted of laboratory experiment conducted in the laboratory of seed Science and Technology, IPB and field experiment conducted at Muara Research Station Bogor. A split - split plot design with three replications and three treatment factors i.e. variety, seed viability level, and invigoration treatment, was applied to the experiments. The variety treatment included an irrigated lowland varieties (Ciherang, Maro) and upland rice (Limboto). Seed with different viability levels were provided by applying rapid aging treatments of etanol vapour for 0 and 75 minutes. The invigoration treatments included 50, 100, 150 ppm of GA3 and 100, 150, 200 ppm of KH2PO4. The results indicated the invigoration treatment of KH2PO4 150 ppm could improve seed viability and vigor of rice seed significantly shown on varieties Ciherang and Maro, respectively. The invigoration treatments were also increased rice yield mainly due to the increase of the grain number per panicle.
Keyword: 

Judul: Closed Knight’s Tour pada Papan Catur Berbentuk Persegi Panjang dengan Ukuran Maksimal 8 × 8
Abstrak: Closed Knight’s Tour merupakan langkah kuda yang mengunjungi setiap kotak pada papan catur tepat satu kali dengan langkah kuda berawal dan berakhir pada kotak yang sama. Graf yang terbentuk dari closed knight’s tour dinotasikan sebagai graf G(m,n), dengan m adalah banyaknya baris dan n adalah banyaknya kolom. Graf tersebut memuat Hamiltonian cycle. Sebuah graf terhubung G adalah graf bipartite jika dan hanya jika graf tersebut tidak memiliki cycle dengan panjang ganjil. Papan catur yang memenuhi syarat cukup untuk memiliki closed knight’s tour adalah papan catur berukuran 5 × 6, 5 × 8, 6 × 6, 6 × 7, 6 × 8, 7 × 8, dan 8 × 8.
Keyword: bipartite, closed knight’s tour, hamiltonian cycle, knight’s tour, teori graf