Judul: Pengaruh efektifitas herbisida diuron 500 g/l sc dalam pengendalian gulma pada tanaman tebu (Saccharum officinarum l)
Abstrak: The experiment was conducted to test the efficacy of Diuron 500 g/l SC berbicice of weeds in sugar cane cultivation is inferred based on statistical analysis of the target weed species biomass data. The experiment was conducted PT. PG.PG Rajawali II Unit.. Subang is located in block cidangdeur Pasirbungur village, District Purwadadi, Subang regency, West Java, in January 2011 to March 2011. Experimental design used in this study was a randomized complete randimized design (RKLT) with one factor. This study used six treatments with four rplications. The treatment given is : (P1) Diuron 500 g/I SC with a dose of 0.5 i/ha, (P2)Diuron 500 g/l SC with a dose of 1.0/ha, (P3 Diuron 500 g/l SC with a dose of 2.0 i/ha, (P4) Diuron 500 g/l SC at a dose of 3.0 i/ha, (P5) Manual Weeding, (P6) Control. Diuron 500 g/l SC herbicide effectively suppress weed growth by 10 MSA. In statistical calculations, the average herbicide treatment with a dose of 0.5l/ha, 1.0l/ha, 2.0 l/ha, and 3.0 l/ha showed no significant difference in controlling weed growth an dsignificantly different from control treatment. During the trial found no symptoms of poisoning at treatment doses of 0.5-2.0 l/ha, but on treatment with a dose of 3.0.1 /ha showed mild toxicity scoring or not too harmful
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Judul: Studi efektivitas dua formulasi ametryne dalam mengendalikan gulma pada pertanaman tebu (Saccharum officinarum L.) dilahan kering
Abstrak: Tujuan penelitian ini adalah untuk mengetahui efektifitas dua formulasi ametryne pada beberapa tingkat dosis dalam mengendalikan gulma pada pertanaman tebu (Saccharum officinarum L.) di lahan kering. Penelitian dilaksanakan di perkebunan tebu lahan kering PTP XIV Jati Tujuh, Kabupaten Indramayu, Jawa Barat. Ketinggian tempat berada 13. 50 m di atas permu- kaan laut dengan jenis tanah mediteran ultik dan curah hujan rata-rata 1 834.1 mm/tahun. Penelitian dilaksanakan dari tanggal 28 Januari sampai 22 April 1995. Bahan penelitian yang digunakan adalah pertanaman tebu varietas ROC 11 yang berumur 4 hari sesudah tanam. Bahan perlakuan yang digunakan dalam penelitian yaitu ametryne 50% (w/v) dan ametryne 80% (w/w). Rancangan percobaan yang digunakan adalah Rancangan Petak Terbagi yang disusun secara faktorial, dengan rancangan lingkungan Rancangan Acak Kelompok. Perlakuan terdiri dari dua faktor yaitu jenis formulasi sebagai petak utama yang terdiri dari dua formulasi yaitu ametryne 50% (w/v) dan ametryne 80% (w/w), dan dosis herbisida sebagai anak petak yang terdiri atas 6 taraf yaitu 0, 1, 2, 3, 4 1(kg)/ha dan 2 1(kg)/ha (herbisida pembanding).
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Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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