Judul: Shelf  Life of Soybean Seed (Glycine max) with Pre-Storage Treatment at Different Storage Temperatures
Abstrak: Kualitas benih sangat penting dalam produksi kedelai. Mutu benih dapat menurun pada saat penyimpanan, pemanenan, pengangkutan, dan penyimpanan di gudang. Penelitian ini bertujuan mengetahui pengaruh perlakuan pra simpan terhadap mutu dan daya simpan benih kedelai. Penelitian dilaksanakan pada bulan Februari sampai Agustus 2023 di Laboratorium Penyimpanan dan Pengujian Mutu Benih Departemen Agronomi dan Hortikultura, Fakultas Pertanian, Institut Pertanian Bogor. Penelitian dilakukan dengan rancangan acak lengkap (RAL) Split-plot dengan tiga ulangan. Petak utama adalah suhu simpan yaitu suhu AC (15 - 19℃) dan suhu kamar (26 - 28℃). Anak petaknya adalah perlakuan pra simpan yaitu: kontrol, cuci – jemur, jemur, oven dan fungisida. Kadar air benih pada penyimpanan suhu kamar dan AC hingga 6 bulan setelah simpan masih dibawah 11%. Suhu simpan secara umum tidak berpengaruh nyata terhadap viabilitas, vigor dan kesehatan benih kedelai. Serangan cendawan Aspergillus banyak ditemui pada penyimpaanan benih kedelai. Perlakuan fungisida mampu mempertahankan daya berkecambah 80% hingga bulan setelah simpan. Perlakuan fungisida menunjukkan adanya potensi sebagai pra perlakuan penyimpanan benih kedelai. Benih tanpa perlakuan kehilangan daya berkecambah dibawah 80% pada 3 bulan setelah simpan, sedangkan pada akhir penyimpanan hanya 67%. Perlakuan jemur dapat dijadikan sebagai alternative untuk melindungi benih dari serangan cendawan dengan daya berkecambah lebih dari 80% hingga 5 bulan simpan dan pada 6 bulan simpan memiliki daya berkecambah 74. Penelitian ini menunjukan adanya potensi perlakuan fungisida sebagai perlakuan pra penyimpanan benih kedelai., The seed quality is crucial for soybean production. Seed quality can decrease during storage, harvesting, transportation and werehouse storage. This study aimed to identifiy the effect of seed treatment on the quality and storability of soybean seeds. The research was conducted from February to August 2023 at the Seed Storage and Quality Testing Laboratory, Department of Agronomy and Horticulture, Faculty of Agriculture, Bogor Agricultural University. The research was arranged in a split plot design and a completely randomized design with three replications. The main plot was temperature, that is air conditioning temperature (15-19℃) and room temperature (26-28℃). The subplots was subjected to seed treatment: control, rinse-drying, drying, oven and fungicide. Seed moisture at at both temperatures was under 11% until six months after storage (MAS). Generally, storage temperature does not significantly affect seed viability, vigor, or health. Aspergillus infection was the dominant fungus in soybean seeds during storage. Fungicide treatment maintained a germination percentage of approximately 80% at 6 MSA. Otherwise, the control lost germination under 80% at 3 MSA, and at the end of storage, the germination percentage was approximately 67%. Drying treatment could be an alternative to protect the seed from fungal infection, with a germination percentage of more than 80% at 5 MSA and 74% at 6 MSA. This finding shows the potential of fungicide treatment as a pra treatment for soybean seed storage.
Keyword: Cendawan, Fungisida, Pemanasan, Penjemuran, Viabilitas

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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