Judul: Optimizing Seed Size of Sweet Corn Varieties (Arinta IPB and Verona IPB) to Improve the Physiological Quality
Abstrak: Ukuran benih berkaitan dengan mutu fisiologis yang dihasilkan. Penelitian bertujuan untuk optimalisasi ukuran benih jagung manis varietas Arinta IPB dan Verona IPB untuk meningkatkan mutu fisiologis. Penelitian dilaksanakan pada November 2023 hingga April 2024 di Seed Center KP Leuwikopo IPB untuk proses pemilahan benih, dan di Laboratorium Penyimpanan dan Pengujian Mutu Benih, Departemen Agronomi dan Hortikultura IPB untuk pengujian mutu benih. Penelitian menggunakan Rancangan Acak Lengkap faktor tunggal dengan empat ulangan. Ukuran benih dibagi menjadi empat taraf ukuran, dengan varietas Arinta IPB berdiameter (besar: >8mm; sedang: 6,6-7,9 mm; dan kecil: <6,5 mm) serta varietas Verona IPB berdiameter (besar: >9 mm; sedang: 7,6-8,9 mm; dan kecil: <7,5 mm), dan ukuran campur (semua ukuran). Hasil percobaan menunjukkan bahwa ukuran benih jagung manis berpengaruh terhadap mutu fisiologis yang dihasilkan. Benih berukuran besar menghasilkan mutu fisiologis tertinggi dibanding dengan taraf ukuran lain. Viabilitas awal benih kedua varietas masih sangat tinggi yaitu lebih dari 80,0%. Jagung manis varietas Verona IPB memiliki bobot 1000 butir lebih tinggi dibandingkan Arinta IPB. Benih berukuran besar memiliki bobot 1000 butir lebih tinggi dibandingkan bobot 1000 butir awal (benih campuran), sementara benih berukuran sedang dan kecil memiliki bobot yang lebih rendah. Benih jagung varietas Arinta IPB dan Verona IPB memiliki variasi ukuran yang sangat tinggi. Proporsi tertinggi benih kedua varietas dimiliki oleh benih berukuran sedang yakni varietas Arinta IPB sebesar 70,3% dan Verona IPB 57,1%. Viabilitas dan vigor lot benih jagung manis kedua varietas terbukti dapat ditingkatkan dengan mengeliminasi benih berukuran kecil. Implementasi pemilahan benih untuk meningkatkan viabilitas dan vigor benih jagung manis varietas Verona IPB perlu menjadi perhatian karena proporsi benih berukuran kecil cukup tinggi sebesar 27,0%., The size of seeds is related to the physiological quality produced. This research aims to optimize the seed size of the sweet corn varieties Arinta IPB and Verona IPB to improve physiological quality. The research was carried out from November 2023 to April 2024 at the Seed Center of KP Leuwikopo IPB for seed sorting processes and at the Seed Storage and Quality Testing Laboratory, Department of Agronomy and Horticulture IPB for seed quality testing. The research used a randomized complete design (RCD) with a single factor and four replications. The seed sizes are divided into four categories, with the Arinta IPB variety having diameters: (large: >8mm; medium: 6,6-7,9 mm; and small: <6,5 mm) and the Verona IPB variety has diameters as follows: (large: >9 mm; medium: 7,6-8,9 mm; and small: <7,5 mm), and mixed sizes (all sizes). The experimental results showed that the size of sweet corn seeds influences the physiological quality produced. Large seeds produce the highest physiological quality compared to other size level. The initial viability of seeds for both varieties was still very high, over 80,0%. The sweet corn variety Verona IPB had a higher 1000-seed weight compared to Arinta IPB. Large seeds had a higher 1000-seed weight compared to the initial 1000-seed weight (mixed seeds), while medium and small seeds had lower weights. The Arinta IPB and Verona IPB varieties had very high variation in size. The highest proportion of seeds for both varieties is found in medium sized
Keyword: mutu fisik, mutu fisiologis

Judul: The Effect of Mung Bean Seed Size on the Physiological Quality of Mung Bean Seed
Abstrak: Kacang hijau termasuk salah satu komoditas unggul ekspor tanaman pangan. Upaya untuk meningkatkan produksi kacang hijau harus diimbangi dengan penyediaan benih yang memiliki nilai mutu benih tinggi. Mutu fisik dan mutu fisiologis termasuk dari aspek mutu benih. Penelitian ini bertujuan menganalisis pengaruh ukuran benih terhadap mutu fisiologis benih kacang hijau pada varietas Vima 1 dan Vima 3. Penelitian ini dilaksanakan pada bulan Mei sampai Juli 2023. Tempat pelaksanaan penelitian di Laboratorium Pengolahan Benih Seed Center dan Laboratorium Penyimpanan dan Pengujian Mutu Benih, Institut Pertanian Bogor. Penelitian ini menggunakan Rancangan Acak Lengkap (RAL) dengan faktor tunggal yaitu ukuran benih dengan empat taraf ukuran (besar, sedang, kecil dan campuran). Taraf ukuran campuran berasal dari kondisi awal tanpa pemilahan. Hasil penelitian menunjukkan bahwa ukuran benih pada varietas Vima 1 berpengaruh terhadap bobot kering kecambah normal, indeks vigor setelah pengusangan, daya hantar listrik sebelum dan setelah pengusangan. Ukuran benih varietas Vima 3 berpengaruh terhadap indeks vigor setelah pengusangan, daya hantar listrik sebelum dan setelah pengusangan. Benih berukuran besar pada varietas Vima 1 memiliki bobot kering kecambah normal paling tinggi 0,85 g dengan kebocoran membran paling rendah dan nilai daya hantar listriknya 21,70 μS/ cm.g. Benih berukuran besar pada varietas Vima 3 memiliki nilai daya hantar listrik paling rendah disaat sebelum pengusangan 24,44 μS/ cm.g dan setelah pengusangan 18,60 μS/ cm.g. Benih berukuran besar hasil pemilahan dengan air screen cleaner menunjukkan mutu paling baik pada kedua varietas., Green beans are one of the leading export commodities for food crops. Efforts to increase green bean production must be balanced with the provision of seeds that have high seed quality values. Physical quality and physiological quality are included in the aspect of seed quality. This study aims to analyze the effect of seed size on the physiological quality of mung bean seeds in Vima 1 and Vima 3 varieties. This research was conducted from May to July 2023. The location of the research was the Seed Center Seed Processing Laboratory and Seed Quality Testing and Storage Laboratory, Institute of Agriculture Bogor. This study used a completely randomized design (CRD) with a single factor, namely seed size with four size levels (large, medium, small, and mixed). Mixed-size levels are derived from the initial conditions without sorting. The results showed that the seed size of the Vima 1 variety had an effect on the dry weight of normal sprouts, the vigor index after being worn out, and the electrical conductivity before and after being worn out. The seed size of the Vima 3 variety has an effect on the vigor index after obsolescence, and electrical conductivity before and after obsolescence. The large seeds of the Vima 1 variety had the highest dry weight of normal sprouts at 0.85 g with the lowest membrane leakage and an electrical conductivity value of 21.70 μS/ cm.g. Large seeds of the Vima 3 variety have the lowest electrical conductivity value before aging 24.44 μS/ cm.g and after aging 18.60 μS/cm.g. Large seeds as a result of sorting with air screen cleaner show the best quality in both varieties.
Keyword: ukuran benih, viabilitas, vigor, vima 1, vima 3

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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