Judul: Evaluation of Growth and Production of Sambung Nyawa at Different Harvesting Ages
Abstrak: Penelitian ini bertujuan mengevaluasi pertumbuhan dan produksi sambung nyawa pada umur panen yang berbeda. Penelitian menggunakan Rancangan Acak Kelompok (RAK) dengan 4 kelompok terdiri dari 3 perlakuan. P1= Umur panen 40 hari, P2= Umur panen 50 hari, dan P3= Umur panen 60 hari. Pubah yang diamati meliputi pertumbuhan tanaman (pertumbuhan tinggi, jumlah cabang, dan jumlah daun) dan produksi tanaman (berat segar, berat kering, dan luas daun). Data dianalisis menggunakan ANOVA dan apabila berbeda nyata (p<0,05) akan dilanjut dengan uji Duncan. Hasil penelitian menunjukkan perlakuan perbedaan umur panen mempengaruhi (p<0,05) pertumbuhan tinggi, jumlah daun, berat segar batang, berat segar daun, total biomassa berat segar, berat kering batang, berat kering daun, berat kering pucuk, dan total biomassa berat kering. Perlakuan perbedaan umur panen tidak mempengaruhi (p>0,05) jumlah cabang, luas daun, luas pucuk, dan berat segar pucuk. Hasil penelitian menunjukkan bahwa perlakuan umur panen 60 hari (P3) memberikan hasil terbaik pada pertumbuhan dan produksi biomassa tanaman sambung nyawa., This study aims to evaluate the growth of plant height and plant production with differentharvesting ages. This study used a Randomized Group Design (RAK) with 4 groups consisting of 3 treatments. P1= 40 days harvest age, P2= 50 days harvest age, and P3= 60days harvest age. The variables observed included plant growth (height growth, number of branches, and number of leaves) and plant production (fresh weight, dry weight, and leaf area). Data were analyzed using ANOVA and if significantly different (p<0.05) willbe continued with Duncan test. The results showed that the treatment of different harvestages affected (p<0.05) the growth of height, number of leaves, stem fresh weight, leaf fresh weight, total biomass fresh weight, stem dry weight, leaf dry weight, shoot dry weight, and total biomass dry weight. The treatment of different harvest ages did not affect (p>0.05) the number of branches, leaf area, shoot area, and shoot fresh weight. Theresults showed that the 60-day harvest age treatment (P3) gave the best results on plant growth and plant biomass production.
Keyword: growth, Gynura procumbens, harvesting, harvesting age, production

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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