Judul: Growth, Seed Production and Quality of Sorghum bicolor cv. Samurai 1 at Different Harvest Ages
Abstrak: Penelitian ini dilaksanakan di Unit Pendidikan dan Penelitian Peternakan Jonggol, Institut Pertanian Bogor. Rancangan percobaan menggunakan Rancangan Acak Kelompok (RAK) dengan 5 perlakuan yaitu P90, P95, P100, P105, P110 dan 5 ulangan. Peubah yang diamati dalam penelitian ini adalah tinggi tanaman, diameter batang, biomassa berat kering, berat kering daun, berat kering malai, berat kering batang, biomassa malai kering, rataan jumlah benih kering per malai, berat benih pipil kering, berat 1000 benih kering, produksi benih kering per ha dan viabilitas. Hasil penelitian menunjukan umur tanaman tidak mempengaruhi (P>0,05) tinggi tanaman,tetapi umur tanaman mempengaruhi (P<0,05) diameter batang berbeda nyata, berat kering tanaman, berat kering tanaman, biomassa kering malai, rataan jumlah benih kering, berat benih pipil kering, berat 1000 benih kering, produksi benih per ha dan viabilitas berbeda sangat nyata (P<0,01). Produksi benih tertinggi diperoleh pada perlakuan umur 110 hari yakni biomassa malai kering 3,01 kg, rataan jumlah benih kering 1874, berat benih pipil 47,2 g, berat 1000 benih yaitu 26 g, produksi benih per ha 8610,49 kg ha-1dan viabilitas 70,8%., The study was conducted at the Jonggol Animal Husbandry Education and Research Unit, Bogor Agricultural University. The experimental design used was Randomized Block Design (RDB) with 5 treatments including P90, P95, P100, P105, P110 and 5 replications. The variables observed in this study were plant height, stem diameter, dry weight biomass, leaf dry weight, panicle dry weight, stem dry weight, dry panicle biomass, average number of dry seeds per panicle, dry seed weight of dry shells, weight of 1000 dry seeds, dry seed production per ha and viability. The results showed that plant height was not significantly influenced by harvest age, while thw harvest age affected stem diameter (P<0,05) and plant dry weight biomass, leaf dry weight, panicle dry weight, stem dry weight, panicle dry biomass, average number of dry seeds, seed shed weight. dry weight, 1000 dry seed weight, seed production per ha and viability were significantly different (P<0.01). The best performance of experimental plants including were dry panicle biomass 3.01 kg, the average number of dry seeds was 1874, the seed weight was 47.2 g, the weight of 1000 seeds was 26 g, seed production per ha was 8610.49 kg ha-1 and viability was 70, 8% were obtained from plantes harvested at 110 days.
Keyword: Seed production, sorghum samurai 1, viability

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: Invers Drazin dari Matriks Toeplitz Singular
Abstrak: Matriks Toeplitz adalah matriks yang setiap unsur pada diagonal utama bernilai sama dan setiap unsur pada subdiagonal yang bersesuaian dengan diagonal utama juga bernilai sama. Matriks singular adalah matriks yang tidak bisa ditentukan inversnya. Akan tetapi, dapat diupayakan untuk ditentukan inversnya menggunakan invers matriks yang diperumum. Invers Drazin merupakan salah satu jenis invers matriks yang diperumum. Pada karya ilmiah ini ditentukan invers Drazin dari matriks Toeplitz singular dengan menggunakan metode Leverrier Faddeev. Kemudian, ditentukan invers Drazin dari matriks Toeplitz singular yang direpresentasikan sebagai penjumlahan segitiga bawah dan segitiga atas matriks Toeplitz berdasar pada teorema Gohberg dan Semencul., Toeplitz matrix is a matrix in with element on the main diagonal has the same value and on the subdiagonal corresponding to the main diagonal also has the same value. Singular matrix is a matrix that has no inverse. However, it can be attempted to determine the inverse using a generalized inverse matrix. Inverse Drazin is a type of generalized matrix inverse. This paper discussed the inverse Drazin for a singular Toeplitz matrix using the Leverrier Faddeev method. Then, the Drazin inverse of the singular Toeplitz matrix which is represented as a sum of products of lower and upper triangular Toeplitz matrix based on Gohberg and Semencul theorem.
Keyword: inverse Drazine, singular Toeplitz matrix