Judul: Kemunduran Benih Kedelai Akibat Pengusangan Cepat Menggunakan Alat IPB 77-1 MM dan Penyimpanan Alami
Abstrak: Seed deterioration characterized by decrease in viability, vigor and an increase in free fatty. This research was conducted to determine the comformity of the decrease in viability, vigor and an increase in free fatty acids of soybean seed of varieties Anjasmoro and Wilis has aging using accelerated aging machine IPB 77-1 MM compared to natural storage and to determine correlation between viability and vigor compared to free fatty acids. The research consisted of two experiments the natural storage and accelerated aging. Natural storage consists of 5 of storage periods of 0, 2, 4, 6, 8 weeks while accelerated aging consists of 5 of aging periods of 0, 15, 30, 45, 60 minutes. The result showed that the conformity (significant) decrease in viability and vigor between natural storage for 8 weeks compared to accelerated aging for 60 minutes, while in free fatty acids absence of conformity (not significant) between natural storage for 8 weeks (assumed after natural storage for 8 weeks will be increase free fatty acids) compared to accelerated aging for 30 minutes (Anjasmoro) and 15 minutes (Wilis). Viability and vigor compared to free fatty acids had negative correlation, it means increase in free fatty acids effect to decrease in viability and vigor.
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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: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology