Judul: Pengujian Toleransi Padi (Oryza Sativa L.) Terhadap Salinitas Pada Fase Perkecambahan
Abstrak: The objective of the research was to find out a simple, quick, and inexpensive method for testing salt tolerance of rice genotypes at germination phase. Experiments were conducted at the Laboratory of Seed Science and Technology, Bogor Agricultural University, and in a green house at Experimental Station Muara, Bogor from June 2010 until February 2011. A total of 40 rice genotypes were used in the experiments. The standard method for testing salinity tolerance was applied in the green house where two week old seedling were transplanted to soil medium salinized with 4 000 ppm NaCl for 8 weeks. Dead leaf percentage variable could differentiate 7 tolerant rice genotypes, 19 moderately tolerant, 14 moderately susceptible, and 4 susceptible. Lalan was the most tolerant rice genotype with the lowest dead leaf percentage (30.03%), perfomed followed by B11844-MR-23-4-6, B13133-9-MR-3-KY-2 and B13136-3-MR-1-KY-5. Germinating seed on stensil paper in UKDdp method with 8 000 ppm NaCl for 14 days was the best method for differentiating the tolerant varieties from the susceptible at the laboratory condition. However, The correlation coefficient value between salinity tolerance variable in the laboratory and in the greenhouse is low -0.12608.
Keyword: 

Judul: Pengujian Toleransi Genotipe Padi (Oryza sativa L.) terhadap Salinitas Pada Fase Perkecambahan
Abstrak: Percobaan ini dilakukan untuk mencari metode pengujian toleransi padi terhadap salinitas yang cepat dan mudah pada stadia perkecambahan dan menyeleksi genotipe padi sawah yang toleran terhadap salinitas pada stadia perkecambahan yang dilaksanakan di Laboratorium Ilmu dan Teknologi Benih dan Rumah Kaca di Leuwikopo, IPB, Darmaga pada bulan April sampai Nopember 2009. Percobaan ini menggunakan bahan-bahan yaitu tiga varietas padi toleran salinitas (Pokkali, Dendang, Lalan), tiga varietas peka salinitas (IR 64, Widas, Batanghari), NaCl, 54 genotipe yang belum diketahui toleran atau peka, aquades, tali, berbagai jenis kertas (merang, koran, stensil, Samson impor, HVS 80 gram, sampul, roti, tisu towel), kapas. Alat-alat yang digunakan meliputi bak plastik, alat pengecambah benih IPB 72-1, alat pengepres, pinset, hand spayer, cawan, alat tulis, oven, kertas label, kamera, plastik, amplop, gelas ukur, timbangan analitik. Pengamatan yang dilakukan antara lain: panjang akar, panjang tajuk, panjang bibit, bobot akar, bobot tajuk, bobot bibit, gejala salinitas.
Keyword: 

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