Judul: Perlakuan Priming Benih untuk Mempertahankan Vigor Benih Kacang Panjang (Vigna unguiculata) Selama Penyimpanan
Abstrak: The objective of this research was to study the effect of priming to maintain vigor of longbean seeds during storage. The treatments were priming in water, KNO3, CaCl2, ascorbic acid, and imbibition beetwen papers for two hours. Osmoconditioning and hydropriming increased seeds moisture content about 9% whereas imbibition between papers increased about 1-2% over the control. After teatment, the seeds were dryed back to reduce moisture content to about 12-13% and then stored in ambient (26-30.8 °C; RH 68-77 %) and AC (±20 °C; RH ±50%) temperature packed in polypropilen plastic bags (thick 0.08 mm). Hydropriming, priming in CaCl2, KNO3, and ascorbic acid solution increased vigor index and speed of germination longbean seeds. The advantages of these treatments could be maintained until 15 weeks of storage, both in AC and ambient temperature. Hydropriming was the best choice for seed treatment before storage, because it was inexpensive and easy to applied.
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Judul: Effect of Invigoration on Seed Viability and Vigor, Plant Growth and Yield of Several Seed Lot Varieties of Cowpea (Vigna unguiculata L. Walp.)
Abstrak: Penelitian ini bertujuan mengetahui efek invigorasi terhadap viabilitas dan vigor benih, pertumbuhan tanaman dan hasil dari beberapa lot benih varietas kacang tunggak yang telah mengalami penyimpanan. Penelitian terdiri atas dua percobaan. Percobaan pertama menggunakan rancangan acak lengkap faktorial dengan dua faktor yaitu lot benih (kombinasi varietas dan umur simpan) dan perlakuan invigorasi benih. Lot benih terdiri atas lima taraf, yaitu varietas Albina umur simpan 1 tahun 6 bulan (V1A1), varietas Albina umur simpan 1 tahun 2 bulan (V1A2), varietas Tampi umur simpan 3 tahun 5 bulan (V2A3), varietas KT-7 umur simpan 3 tahun 5 bulan (V3A3), varietas Uno umur simpan 1 tahun 5 bulan (V4A4). Perlakuan invigorasi terdiri atas tiga taraf, yaitu kontrol (I0), hydropriming dengan aerator selama 16 jam pada suhu 20 ºC (I1), dan matriconditioning dengan arang sekam (0,5 mm) dengan rasio benih, arang sekam, dan air 1:0,4:0,5 (b/b/v) selama 18 jam pada suhu 20 ºC (I2). Percobaan kedua dilakukan di lapangan menggunakan rancangan kelompok lengkap teracak faktorial. Faktor yang diujikan sama seperti yang digunakan pada percobaan pertama. Perlakuan invigorasi hydropriming dengan aerator dan matriconditioning dengan arang sekam pada benih kacang tunggak yang telah mengalami penyimpanan masih dapat mempertahankan viabilitas dan vigor benih serta pertumbuhan vegetatif tanaman meskipun tidak berbeda nyata dengan kontrol, kecuali lot benih V1A1 dan V1A2 pada perlakuan hydropriming serta lot benih V1A2 pada perlakuan matriconditioning yang berefek negatif. Kedua perlakuan invigorasi benih tidak berpengaruh nyata pada tolok ukur fase generatif dan hasil tanaman kacang tunggak.
Keyword: hydropriming, matriconditioning, penyimpanan benih, umur simpan

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