Judul: Pengaruh Perlakuan Insersi Bakteri Rhizobium sp. dan Periode Simpan Terhadap Hasil dan Mutu Fisiologi Benih Kedelai (Glycine max L. Merrill)
Abstrak: The purpose of the experiment 1 were to confirm the present of the bacteria Rhizobium sp., which had inserted into the seed tissue through the vacum technology and to study the effect of inserted seed quality during storage periods. Experiment 2 was conducted to study the growth of inserted soybean seed on their ability of producing the soybean seed and to study the performance of the physiological character during the period of storage. The result experiment 1, the microscopy analysis of soybean seed slide indicated that the bacteria Rhizobium sp. were located on the palisade seed tissue. The bacteria remained viable inside the seed tissue during 0 – 4 months storage period. The population of bacteria cell inside the seed tissue were maintained in 10 5 cell per ml. This population was reasonable enough to qualify the requirement of root infection. The quality of seed in term of germination percentage, vigor index and germination speed of seed remained stable until 3 months storage period although the last two variables reduced significantly after 4 months. The vigor index and germination speed were reduced from 90.67 to 58.67 % and from 31.78 to 28.69 % / etmal, respectively. The experiment 2 was conducted using the split plot design with two factors that storage period as the main plot and insertion of bacteria as a sub plot. The result of the experiment showed that during the vegetatif phase, the inserted seed performed best growth which are indicated by better plant of height, number of leaf, number of nodules, wet and dried weight of nodules. Similarly during the generatif phase, the ability of plant on producing the soybean seed which are indicated from the wet and dried weight of upper and lower plant biomass, number of pod, dried weight of pod including dried weight of seed, inserted seed significantly better than control plant. The quality of seed which produced from inserted seed plant, in term of germination speed and vigor index of seed was also better than seed produced from control plant. In conclusion, inserted seed with Rhizobium sp. could support the growth of soybean plant and producing the good quality of soybean seeds compared from the uninserted soybean seed.
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Judul: Pengaruh Perlakuan Matriconditioning Plus Inokulan Terhadap Pertumbuhan Tanaman, Hasil dan Mutu Benih Kedelai Hitam (Glycine soja)
Abstrak: The research purpose to study the effect of treatment matriconditioning plus inoculant on plant growth, yield and quality of seed of black soybean held in the greenhouse Balitkabi Malang and Experiment Garden IPB Bogor. The study was conducted two phases, 1. Rhizobium compatibility of black soybean and 2. Matriconditioning treatment to improve the efficiency of Rhizobium on growth, yield and quality of seeds of soybean black. The first study using two-factor treatments (Factor A: two levels of varieties, and factor B: the five levels of Rhizobium inoculation treatments) arranged in randomized complete blog design of four replications. The second study consisted of factor A (two levels varieties) and factor B (four levels of treatment matriconditioning) using a split plot design of four replications. The results showed that Rhizobium inoculant is more compatible to Detam 1 compared Detam 2. The treatment of matriconditioning plus Rhizobium inoculant using rice husk charcoal for 12 hours can increase the natural rhizobium population by 15-fold, increase N content of plant up to 17.9% compared to regular inoculation and 28% compared with no treatment and increase the chlorophyll content of leaves up to 7.8-fold compared with no treatment. Inoculation is performed in matriconditioning can increase Rhizobium infectivity by 17% compared to the normal way, but no effect on the black soybean seed yield and quality of seeds produced
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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