Judul: Performance of Morpholgical, Agronomic and  Yield Potential of F7 Sorghum Breeding Lines IPB Selected through Pedigree and  Bulk Method
Abstrak: Galur hasil pemuliaan tanaman perlu dikarakterisasi secara lengkap mencakup karakter morfologi, agronomi, dan komponen hasil. Penelitian bertujuan untuk mempelajari keragaan morfologi, agronomi, potensi hasil; menyeleksi galur unggul; serta mengelompokkan galur-galur F7 sorgum berdasarkan kemiripan karakter. Penelitian ini dilaksanakan mulai bulan Februari hingga Juli 2021 di Kebun Percobaan Leuwikopo, Laboratorium Mikroteknik, dan Laboratorium Pemuliaan Tanaman, Departemen Agronomi dan Hortikultura, IPB. Rancangan percobaan menggunakan rancangan kelompok lengkap teracak satu faktor yaitu genotipe. Genotipe sorgum yang digunakan berjumlah 17 galur F7 sorgum IPB serta 5 varietas pembanding yaitu Numbu, Kawali, Soraya IPB 2, PI-10-90-A dan PI 150-20-A. Kemiripan galur berdasarkan karakter morfologi, agronomi, potensi hasil dianalisis menggunakan software PBSTAT-CL. Hasil penelitian menunjukan galur-galur F7 memiliki karakter yang beragam, kecuali pada karakter lebar daun, jumlah daun hijau saat maturity, diameter malai, kandungan gula (brix) batang fase generatif, kerapatan malai saat matang dan kandungan antosianin pada daun. Galur A-1-23-1-1 memiliki jumlah daun hijau saat anthesis nyata lebih banyak dibandingkan seluruh pembanding serta daun hijau saat maturity lebih banyak terhadap seluruh pembanding. Galur A-18-3-4-7, A-18-12-7-5, B-14-25-5-6 merupakan galur dengan kandungan gula (brix) saat panen nyata lebih besar terhadap pembanding Kawali. Galur A-21-14-2-1, B-14-25-5-6, C-375-17-5-9 memiliki potensi hasil nyata lebih besar terhadap pembanding PI-150-20-A., Sorghum breeding lines need to be characterized include morphological, agronomic, yield potential. This study aim to learn about morphological, agronomic and yield potential; lines selection superior; grouping of sorghum genotypes based on character resemblance. Experiment was conducted from Februari to July 2021 at Leuwikopo experiment field of IPB University, Microtechnical Laboratory, and Plant Breeding Laboratory Department of Agronomy and Horticulture, IPB University. Experimental design used was a randomized complete block design with genotype as the treatment factor. The plant materials used were 17 F7 lines and 5 varieties as control is; Numbu, Kawali, Soraya IPB 2, PI-10-90-A, PI-150-20A. The similarity of the lines was analyzed using PBSTAT-CL software. Genotype F7 lines had varios on characters; except for character of leaf width, number of green leaves at maturity, panicle diameter, sugar iii content (brix) of generative phase stems, panicle density when ripe and anthocyanin content in leaves. A-1-23-1-1 line had more green leaves at anthesis and maturity than all comparisons. A-18-3-4-7, A-18-12-7-5, B-14-25-5-6 were lines with significantly higher sugar content (brix) at harvest than the Kawali comparison. The lines A-21-14-2-1, B-14-25-5-6, C-375-17-5-9 had significantly higher yield potential than the PI-150-20-A
Keyword: bioethanol, brix, cluster analysis, qualitative, quantitatif

Judul: Keragaan Karakter Agronomi dan Hasil Galur Sorgum Generasi F7 Hasil Seleksi Pedigree-Bulk
Abstrak: Sorgum merupakan salah satu komoditas pangan untuk diversifikasi pangan yang memiliki banyak potensi untuk dikembangkan. Tujuan penelitian adalah memperoleh galur-galur sorgum generasi F7 hasil seleksi pedigree dan bulk yang mempunyai keragaan karakter agronomi, komponen hasil yang unggul. Galur-galur F7 hasil seleksi tersebut diuji untuk mendukung pelepasan varietas. Penelitian dilaksanakan pada bulan Februari sampai Juli 2021 di Kebun Percobaan Leuwikopo dan Laboratorium Pemuliaan Tanaman Departemen Agronomi dan Hortikultura IPB University. Materi genetik yang digunakan yaitu 17 galur F7 hasil persilangan PI 10-90-A x Numbu, PI 150-20-A x Numbu, dan PI 150-20-A x Kawali. Percobaan disusun menggunakan rancangan kelompok lengkap teracak dengan satu perlakuan genotipe yang diulang sebanyak tiga kali. Hasil analisis ragam menunjukkan genotipe berpengaruh sangat nyata terhadap karakter tinggi tanaman, jumlah daun, panjang daun, diameter batang, umur berbunga, umur panen, panjang malai, biomas basah, biomas kering, potensi biomas basah per hektar, potensi biomas kering per hektar, bobot malai kering, bobot biji per malai, dan bobot 1000 biji. Hasil penelitian menunjukkan genotipe A-1-23-1-1 berpotensi untuk produksi bioetanol. Genotipe B-4-6-7 berpotensi dikembangkan untuk sorgum varietas genjah. Genotipe C-375-17-5-9 berpotensi untuk dijadikan galur harapan berdaya hasil unggul. Genotipe dari galur hasil pemuliaan menunjukkan respon sangat tahan terhadap penyakit antraknosa dan karat daun, kecuali B-14-25-5-6 dan B-182-5-12-7., Sorghum is one of the food commodities for food diversification that has a lot of potential to be developed. The research aimed to obtain F7 generation sorghum lines from pedigree and bulk selection was had superior agronomic characters and yield components. The selected F7 lines were tested to support the release of varieties. The research was conducted from February to July 2021 at Leuwikopo Experimental Farm and Plant Breeding Laboratory of the Department of Agronomy and Horticulture, IPB University. The genetic materials used were 17 F7 lines from the cross of PI 10-90-A x Numbu, PI 150-20-A x Numbu, and PI 150-20-A x Kawali. The experiment was arranged using a randomized complete block design with one genotype treatment factor which were replicated three times. Analysis of variance showed that genotypes had a very significant effect on the characters of plant height, number of leaves, leaf length, stem diameter, flowering age, harvest age, panicle length, fresh biomass, dry biomass, potential fresh biomass per hectare, potential dry biomass per hectare, dry panicle weight, seed weight per panicle, and weight of 1000 seeds. The results showed that genotype A-1-23-1-1 has the potential for bioethanol production. Genotype B-4-6-7 has the potential to be developed for early-maturity sorghum varieties. Genotype C-375-17-5-9 has the potential to be used as a high-yielding hope lines. The breeding lines showed a very resistant response to anthacnose and leaf rust, except for the B-14-25-5-6 and B-182-5-12-7.
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Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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