Judul: Hydration Dehydration Treatment of Bambara Groundnuts (Vigna subterranea L. Verdc)  Seed Vigor
Abstrak: Upaya yang dapat dilakukan untuk meningkatkan produktivitas kacang bambara antara lain adalah menjamin ketersediaan benih bermutu, namun terdapat kendala dalam penyediannya. Penelitian ini bertujuan mempelajari pengaruh hidrasi-dehidrasi sebagai perlakuan invigorasi terhadap viabilitas dan vigor benih kacang bambara (Vigna subterranea L. Verdc). Penelitian ini dilaksanakan pada bulan Juni hingga Agustus 2019 di Laboratorium Pengujian Benih, Departemen Agronomi dan Hortikultura, Institut Pertanian Bogor. Percobaan dirancang menggunakan rancangan acak lengkap (RAL) dengan dua faktor. Percoban dilakukan pada lanras Tasikmalaya. Faktor pertama adalah lot benih dipanen Maret 2019, lot benih dipanen Oktober 2017. Faktor kedua adalah perlakuan hidrasi￾dehidrasi yang terdiri atas 5 taraf, yaitu kontrol, (perendaman dalam air selama 12 jam lalu dikeringkan 4 jam) pada suhu 28oC-30oC, suhu 38oC-40oC, suhu 28oC- 30oC, suhu 38oC-40oC. Perlakuan hidrasi-dehidrasi mampu meningkatkan vigor benih kacang bambara dengan peningkatan nilai indeks vigor dari 15,9% menjadi 27% dan kecepatan tumbuh dari 9%etmal-1 menjadi 11%etmal-1., Effort that can be done to increase the productivity of bambara groundnuts include ensuring the availability of quality seeds, but there are obstacles in the process of providing the seeds. This research aims to study the effect of hydration￾dehydration as an invigoration treatment on vigor and viability of two lots of bambara groundnut seeds (Vigna subterranea L. Verdc.). This research was conducted from June to August 2019 at Seed Testing and Storage Laboratory, Department of Agronomy and Horticulture, IPB University. The experiment was designed using a completely randomized design (CRD) with two factors. The experiment was conducted on the Tasikmalaya landraces. The first factor is the seed lot, harvested in March 2019, harvested in October 2017. The second factor is hydration-dehydration consisting of five levels, namely control, (soaking in water for 12 hours and then dried for 4 hours) at temperature 28oC-30oC, at temperature 38oC-40oC, at temperature 28oC-30oC, at temperature 38oC-40oC. Hydration￾dehydration treatment was able to increase seed vigor of bambara groundnut seeds by increasing the vigor index value from 15.9 % to 27% and the speed of germination from 9%etmal-1 to 11%etmal-1.
Keyword: Invigoration,, Bogor groundnuts, Seed deterioration, Viability

Judul: Hydration Dehydration Treatment Of Bambara Groundnuts (Vigna subterranea L. Verdc) Seed Vigor
Abstrak: Upaya yang dapat dilakukan untuk meningkatkan produktivitas kacang bambara antara lain adalah menjamin ketersediaan benih bermutu, namun terdapat kendala dalam penyediannya. Penelitian ini bertujuan mempelajari pengaruh hidrasi-dehidrasi sebagai perlakuan invigorasi terhadap viabilitas dan vigor benih kacang bambara (Vigna subterranea L. Verdc). Penelitian ini dilaksanakan pada bulan Juni hingga Agustus 2019 di Laboratorium Pengujian Benih, Departemen Agronomi dan Hortikultura, Institut Pertanian Bogor. Percobaan dirancang menggunakan rancangan acak lengkap (RAL) dengan dua faktor. Percoban dilakukan pada lanras Tasikmalaya. Faktor pertama adalah lot benih dipanen Maret 2019, lot benih dipanen Oktober 2017. Faktor kedua adalah perlakuan hidrasi-dehidrasi yang terdiri atas 5 taraf, yaitu kontrol, (perendaman dalam air selama 12 jam lalu dikeringkan 4 jam) pada suhu 28 o C-30 o C, suhu 38 o C-40 o C, suhu 28 o C-30 o C, suhu 38 o C-40 o C. Perlakuan hidrasi-dehidrasi mampu meningkatkan vigor benih kacang bambara dengan peningkatan nilai indeks vigor dari 15,9% menjadi 27% dan kecepatan tumbuh dari 9%etmal -1 menjadi 11%etmal -1., Effort that can be done to increase the productivity of bambara groundnuts include ensuring the availability of quality seeds, but there are obstacles in the process of providing the seeds. This research aims to study the effect of hydration- dehydration as an invigoration treatment on vigor and viability of two lots of bambara groundnut seeds (Vigna subterranea L. Verdc.). This research was conducted from June to August 2019 at Seed Testing and Storage Laboratory, Department of Agronomy and Horticulture, IPB University. The experiment was designed using a completely randomized design (CRD) with two factors. The experiment was conducted on the Tasikmalaya landraces. The first factor is the seed lot, harvested in March 2019, harvested in October 2017. The second factor is hydration-dehydration consisting of five levels, namely control, (soaking in water for 12 hours and then dried for 4 hours) at temperature 28 o C-30 o C, at temperature 38 o C-40 o C, at temperature 28 o C-30 o C, at temperature 38 o C-40 o C. Hydration-dehydration treatment was able to increase seed vigor of bambara groundnut seeds by increasing the vigor index value from 15.9 % to 27% and the speed of germination from 9%etmal -1 to 11%etmal -1 .
Keyword: Invigoration, Bogor Groundnuts, Seed deterioration, 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