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: Effect of Harvest Ages on Production, Seeds Quality, Biomass of Sorghum of Varieties of Samurai 2
Abstrak: Tujuan dari penelitian ini adalah mengevaluasi produksi, kualitas benih, dan biomassa tanaman sorgum berdasarkan umur panen yang berbeda. Penelitian ini menggunakan tanaman sorgum varietas samurai 2 dan didesain menggunakan rancangan acak kelompok (RAK) dengan 4 perlakuan dan 5 ulangan. Data penelitian dianalisis menggunakan ANOVA, apabila berbeda nyata, dilakukan uji lanjut menggunakan uji Duncan Multiple Range Test (DMRT). Perlakuan umur panen tanaman sorgum terdiri dari 95 HST (U1), 100 HST (U2), 105 HST (U3), dan 110 HST (U4). Peubah yang diukur pada penelitian ini adalah kadar air benih, panjang malai, berat malai, berat kering malai, berat benih pipil, berat kering benih pipil, berat 1000 benih, dan viabilitas benih. Hasil penelitian menunjukkan perlakuan umur panen tanaman sorgum 105 HST signifikan meningkatkan berat benih dan berat 1000 benih. Perlakuan umur panen 105 HST juga signifikan meningkatkan viabilitas benih dan hasil terbaik pada hari ke 4 dan 7, serta biomassa produksi tertinggi., The aim of this study was to evaluate the production, seeds quality, and biomass of sorghum varieties of samurai 2 at harvest ages. This study used sorghum varieties of samurai 2 and designed a Randomized Block Design (RDB) with 4 treatments and 5 replication. The data were analyzed using ANOVA and any significant differences were further tested using Duncan Multiple Range Test (DMRT). Sorghum was harvested at the age of 95 DAH (U1), 100 DAH (U2), 105 DAH (U3), and 110 DAH (U4). The measured variable were moisture content of seed, panicle length, panicle weight, panicle dry weight, weight of pipil seed, dry weight of pipil seed, weight of 1000 seeds, and viability of seed. The results showed that the treatment of sorghum at 105 DAH significantyly increased weight of seed and weight of 1000 seeds. Furthermore, the treatment of sorghum at 105 DAH significantly increased viability of seed and get the best value of day-4 and day-7, and highest of biomassa production.
Keyword: harvest age, panicle, seed, sorghum, viability

Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
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