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: Soybean (Glycine max (L.) Merrill) Seed Longevity Prediction Using Several Vigour Test Methods
Abstrak: Kedelai (Glycine max L.) merupakan salah satu komoditas penting di Indonesia. Metode yang tepat untuk menduga viabilitas berdasarkan nilai daya berkecambah setelah melewati periode tertentu dalam penyimpanan sangat penting untuk memastikan benih kedelai yang sampai ke tangan konsumen (petani) masih memiliki mutu yang baik. Penelitian ini bertujuan mendapatkan satu metode yang mampu menduga daya simpan benih kedelai. Penelitian dilaksanakan di Laboratorium Ilmu dan Teknologi Benih IPB. Penelitian ini menggunakan Rancangan Acak Lengkap (RAL) terdiri dari faktor lot benih yang tersarang pada periode simpan. Faktor pertama adalah lot benih kedelai yang terdiri atas 6 taraf yaitu Dena 1 (tahun 2019), Devon 1 (tahun 2019), Detap 1 (tahun 2019), Anjasmoro (tahun 2019), Gepak Kuning (tahun 2019), dan Argomulyo (tahun 2019). Faktor kedua adalah periode simpan dengan 7 taraf yaitu 0, 1, 2, 3, 4, 5 dan 6 bulan. Benih kedelai dari berbagai varietas yang digunakan sebagai lot benih memiliki daya berkecambah awal berkisar 84,25% - 94,25%, dapat mempertahankan viabilitasnya hingga 73,50% - 79,50% setelah disimpan selama 6 bulan. Kondisi kadar air sebelum penyimpanan berkisar 8,51% - 9,94% dan 8,41% - 9,51% pada 6 bulan penyimpanan. Kondisi suhu dan RH ruang penyimpanan berkisar 20,2 ± 2 ºC dan 49 ± 2% dengan kemasan benih berupa plastik polypropylene (PP) 0,8 mm. Ekstrapolasi pada grafik penurunan daya berkecambah menunjukkan benih kedelai yang diuji memiliki variasi daya simpan antara 8,5 – 11,8 bulan untuk penurunan hingga daya berkecambah 65% atau 7,0 – 8,9 bulan untuk penurunan hingga daya berkecambah 70%. Radicle emergence (RE) yang diamati pada 42 jam merupakan tolok ukur yang paling potensial untuk menduga daya simpan benih kedelai dengan nilai koefisien korelasi sebesar 0,6033 untuk menduga daya simpan hingga daya berkecambah menjadi 65% dan 0,6442 untuk menduga daya simpan hingga daya berkecambah menjadi 70%., Soybean (Glycine max L.) is one of the important commodities in Indonesia. The right method to estimate viability based on the value of germination after a certain period of storage is very important to ensure that soybean seeds that reach consumers (farmers) still have good quality. This study aims to obtain a method that can estimate the seed longevity of soybean. The research was carried out at the Seed Science and Technology Laboratory of IPB. This study used a completely randomized design (CRD) consisting of several nested seed lots in the storage period. The first factor is the soybean seed lot which consists of 6 levels, namely Dena 1 (in 2019), Devon 1 (in 2019), Detap 1 (in 2019), Anjasmoro (in 2019), Gepak Kuning (in 2019), and Argomulyo (in 2019). The second factor is the storage period with 7 levels, namely 0, 1, 2, 3, 4, 5, and 6 months. Soybean seeds of various varieties used as seed lots have initial germination rates ranging from 84.25% - 94.25%, can maintain their viability up to 73.50% - 79.50% after being stored for 6 months. Conditions of water content before storage ranged from 8.51% - 9.94% and 8.41% - 9.51% at 6 months of storage. The temperature and RH conditions of the storage room ranged from 20.2 ± 2 ºC and 49 ± 2%
Keyword: expired date, radicle emergence, rapid aging, storage, viability

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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