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: Evaluasi produksi dan kualitas sorgum samurai 1 pada umur panen berbeda periode generatif
Abstrak: Penelitian ini dilakukan untuk mengevaluasi produksi dan kualitas sorgum samurai 1 pada umur panen berbeda periode generatif. Penelitian dilaksanakan di Unit Pendidikan Penelitian Peternakan Jonggol (UP3J) dan juga di laboratorium agrostologi dan laboratorium Ilmu dan Teknologi pakan Fakultas Peternakan Institut Pertanian Bogor selama 6 bulan. Penelitian ini menggunakan sorgum samurai 1 dengan metode rancangan acak kelompok (RAK) dengan 3 kelompok umur panen 80 HST (U1), 87 HST (U2) dan 94 HST (U3), dengan 5 kali ulangan. Analisis data menggunakan sidik ragam anova dan dilanjutkan dengan uji DMRT. Hasil penelitian menunjukkan bahwa umur panen yang berbeda berpengaruh nyata terhadap berat segar malai dan juga nilai dari NDF. Nilai brix berbanding lurus dengan umur panen, dimana semakin lama umur panen maka nilai brix juga akan semakin meningkat. Umur panen 87 HST memiliki nilai paling tinggi pada berat total sorgum, berat batang, berat daun, dan juga berat malai., This research was conducted to evaluate the production and quality of Sorghum Samurai 1 at different harvesting ages during the generative period. The research was carried out at the Jonggol Animal Husbandry Research Education Unit (UP3J) and also at the agrostology laboratory and feed science and technology laboratory, Faculty of Animal Husbandry, Bogor Agricultural University for 6 months. This study used Sorghum Samurai 1 using a randomized block design (RBD) method with 3 harvesting age groups of 80 DAP (U1), 87 DAP (U2) and 94 DAP (U3), with 5 replications. Data analysis used analysis of variance and continued with the DMRT test. The results showed that different harvest ages had a significant effect on the fresh weight of panicles and also the value of NDF. The value of brix was directly proportional to the age of harvest, where the longer the harvest age, the value of brix will also increase. The harvest age of 87 HST has the highest value on the total weight of sorghum, stem weight, leaf weight, and also panicle weight.
Keyword: DAP, NDF, harvest age, panicle, sorghum

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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