Judul: Determining Seed Storability of Mung Bean Seeds (Vigna radiata) Based on Seed Viability Before Storage
Abstrak: Kacang hijau (Vigna radiata) merupakan salah satu komoditas penting di Indonesia. Mutu benih kacang hijau yang sampai ke tangan petani, sangat menentukan keberhasilan produksi. Benih yang disimpan pada ruang terbuka akan mengalami penurunan viabilitas benih dengan cepat sehingga daya simpan benih perlu diketahui untuk memastikan ketersediaan benih yang bermutu. Penelitian ini bertujuan untuk menetapkan daya simpan benih kacang hijau dengan menggunakan suatu peubah viabilitas atau vigor. Penelitian dilaksanakan mulai dari Januari 2023 hingga Agustus 2023 di Laboratorium Penyimpanan dan Pengujian Mutu Benih, Laboratorium Biologi dan Biofisika Benih, serta Laboratorium Uji Mutu Fisiologis, Departemen Agronomi dan Hortikultura, Fakultas Pertanian, Institut Pertanian Bogor. Penelitian dilaksanakan selama 6 bulan periode simpan dengan menggunakan rancangan acak lengkap (RAL) faktor tunggal yang terdiri dari 10 lot berupa varietas yaitu Vima 1 (a), Vima 2, Vima 3 (a), Vima 4, Vima 5, Vimil 1, Vimil 2, Kutilang, Vima 1 (b) dan Vima 3 (b). Pengamatan sebelum simpan meliputi pengamatan uji daya hantar listrik (DHL), uji pemunculan radikula (RE), uji pengusangan cepat (AAT), indeks vigor (IV), dan kecepatan tumbuh (KCT). Pengamatan saat benih disimpan meliputi pengamatan pada kadar air (KA) dan daya berkecambah (DB) yang diuji setiap bulan. Hasil penelitian menunjukkan adanya penurunan viabilitas benih kacang hijau yang disimpan pada ruang simpan terbuka (suhu 27,329,5 oC dan RH 6173%) dan disimpan dalam kemasan plastik polypropylene 0,8 mm dengan kadar air awal 7,1510,01%. Penetapan daya simpan benih dapat dilakukan dengan menguji daya berkecambah benih kacang hijau sebelum benih disimpan (x) dengan persamaan y = 0,1950x - 13,05, untuk y = daya simpan (bulan). Metode ini dapat digunakan pada penyimpanan jangka pendek untuk tujuan komersial., Mung beans (Vigna radiata) are one of the important commodities in Indonesia. The quality of the mung bean seeds that reach the hands of farmers is crucial to the success of the harvest. Seeds stored in open spaces will experience rapid decrease in seed viability, so the storage capacity of seeds needs to be known to ensure the availability of quality seeds. This research aims to determine the storability of mung bean seeds using a viability or vigor variable. The research was carried out from January 2023 to August 2023 at the Seed Storage and Quality Testing Laboratory, Biology and Biophysics Seed Laboratory, and Physiological Quality Testing Laboratory, Department of Agronomy and Horticulture, IPB University. The research was carried out for 6 month storage period using a single factor Completely Randomized Design (CRD) consisting of 10 lots of the variety, namely Vima 1 (a), Vima 2, Vima 3 (a), Vima 4, Vima 5, Vimil 1, Vimil 2, Kutilang, Vima 1 (b), dan Vima 3 (b). Observations before storage included observations the electrical conductivity test, radicle emergence test (RE), accelerated aging test (AAT), vigor index, and growth rate. Observations when seeds were stored included observations on moisture content and germination capacity which were tested every month. The results showed a decrease in the viability of mung bean seeds stored in open storage (temperature 27.329.5 oC and RH 6173%) and stored in 0.8 mm polypropylene plastic packaging with an initial moisture content of 7.1510.01%. Determining seed storability can
Keyword: mung bean, seed storage period, viability, vigor

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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