Judul: Efektivitas Herbisida IPA Glifosat 486 SL untuk Pengendalian Gulma pada Budidaya Tanaman Karet (Hevea brasiliensis Muel. Arg.) Belum Menghasilkan
Abstrak: The research was conducted in the plantation PTPN VIII Cikumpay Purwakarta, West Java, from September 2012 until December 2012. This reaserch was conducted to test the effectiveness of the herbicide glyphosate IPA 486 SL. The experimental design used in this research were randomized design Complete Group (RKLT) with one factor. This research use seven treatments with four replications. Treatment doses of glyphosate IPA 486 SL given is 1.0 l ha-1 (P1), 1.5 l ha-1 (P2), 2.0 l ha-1 (P3), 2.5 l ha-1 (P4), 3.0 l ha-1 (P5), Weeding Manual (P6), and Control (P7). Herbicide glyphosate IPA 486 SL was not effective in suppressing the growth of weeds in immature rubber plantations.. Calculation the average herbicide treatments at any dose did not show significant differences, although in general there is a decrease in weed dry weight each observation. During observations did not symptoms of poisoning in the rubber plant for each treatment dose. It shows that the application of glyphosate IPA 486 SL herbicide is not dangerous to immature rubber plants
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Judul: Studi efektifitas herbisida glifosat 24 persen untuk mengendalikan gulma di perkebunan karet (Hevea brasilliensis Muel. Arg) yang belum menghasilkan
Abstrak: Penelitian ini bertujuan untuk mengetahui efektif herbisida glifosat 24% dengan adanya penambahan amonium sulfat pada berbagai tingkat dosis dalam mengendalikan gulma di jalur tanaman karet yang belum menghasilkan. Penelitian dilaksanakan pada bulan Mei sampai dengan bulan Agustus 1996 di perkebunan Cibiuk Pandeglang Jawa Barat. Metode penelitian disusun dengan menggunakan rancangan acak kelompok faktor tunggal. Susunan perlakuan terdiri atas 4 ulangan dan 15 perlakuan pengendalian gulma. Perlakuan pengendalian gulma terdiri dari glifosat 24% dengan amonium sulfa! dan tanpa penggunaan amonium sulfat masing-masing dengan dosis (1, 2, 3, 4, 5, 6) ]/ha. Sebagai pembanding digunakan herbisida glifosat 36% dosis 3 I/ha serta pengendalian manual dan tanpa perlakuan pengendalian sebagai kontrol. Tiap satuan percobaan terdiri dari petakan berukuran 26.0 m x 2.4 m, sehingga luas lahan seluruhnya 3 744 m². Total seluruh satuan percobaan 60 buah. Hasil analisis vegetasi awal penelitian menunjukkan terdapat lima gulma dominan berturut-turut terdiri dari Ottochloa nodosa (37.96%), Mikania micrantha (14.25%), Jscahemum timorense (13.72), Axonopus compre.1:1·11s (9.48%), dan Borreria alara (4.58%). Pada akhir penelitian spesies gulma dominan berturut-turut adalah 01tochloa nodosa (40.67%), Borreria ala/a (24.56%), Jschaemum limorense (12.67%), Mikania micrantha (7.67 %) dan Axonopus compressus (7.63 %).
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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