Judul: Pengendalian Gulma Padi Sawah dengan Herbisida Berbahan Aktif Bispyribac Sodium
Abstrak: One of the main problems on increasing rice production is weeds. The objective of this research was to determine the effectiveness of bispyribac sodium herbicide to control weed in paddy field. The experiment was conducted in Cibanteng village, Bogor regency, West Java from November 2012 to February 2013. The research was arranged at randomized block design with four replications which consisted of eight bispyribac sodium treatments i.e: 50 ml ha-1, 100 ml ha-1, 150 ml ha-1, 200 ml ha-1, 250 ml ha-1, 300 ml ha-1, manual weeding and no weeding. The result showed that the application of bispyribac sodium herbicide at a dose of 50 ml ha-1 to 300 ml ha-1 could control Ludwigia octovalvis, Echinocloa crus-galli, Fimbristylis miliacea, Eclipta prostata and Cynodon dactylon weed species. Bispyribac sodium application at all dosages only caused lightweihgt Phytotoxicity Syimptoms on rice plants
Keyword: weed, rice, dosage, bispyribac sodium herbicide

Judul: Pengendalian gulma pada tanaman padi sawah dengan menggunakan herbisida berbahan aktif Bentazon dan MCPA
Abstrak: Weeds are one of major problem in rice intensification. The objective of this research was to observe the effectiveness of bentazon and MCPA as mixed herbicide to control weeds in rice. The experiment was conducted at Bojong Jengkol village, Ciampea district, Bogor regency, West Java from September 2012 until January 2013. This research was arranged in Randomized Block Design with single factor, seven treatments and four replications. The treatments consist of seven treatments with five dosages of herbicide (i.e.: 1.00 L ha-1, 1.50 L ha-1, 2.00 L ha-1, 2.50 L ha-1, and 3.00 L ha-1), conventional weeding (at third and sixth week after transplanted) and no weeding. The result showed that bentazon-MCPA application could control sedges (Fimbristylis miliacea and Cyperus iria) and broadleaf (Ludwigia octovalvis, Alternanthera philoxeroides, and Portulaca oleracea) weeds. Application of bentazon-MCPA caused light-fair toxicity symptomps on rice plants until 2 weeks after application and decreased empty grain percentage about 6-10 % compared with no weeding treatment also increased rice yield productivity about 48.6% and that was not significantly different compared with conventional weeding.
Keyword: Bogor Agricultural University (IPB), weed in rice, weed control, Bentazon & MCPA

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