Judul: Growth and Production of Asystasia gangetica L. at Different Doses of Chicken Manure
Abstrak: Asystasia gangetica (L.) merupakan gulma merugikan lahan pertanian. A. gangetica (L.) dapat dimanfaatkan sebagai sayuran. Di Indonesia A. gangetica dikenal sebagai gulma dibandingkan tanaman budi daya. Gulma ini dapat dijadikan sayuran dan termasuk kedalam sayuran introduksi. A. gangetica (L.) berpotensi untuk diproduksi secara komersial karena kandungan gizi serta manfaatnya yang dimiliki. Pupuk kandang ayam merupakan pupuk organik yang digunakan oleh petani dalam budidaya tanaman sayuran. Penelitian ini dilaksanakan di Kebun Percobaan Cikabayan Bawah, Institut Pertanian Bogor, Bogor, Jawa Barat. Tujuan ialah penelitian ini untuk mengetahui pengaruh beberapa dosis pupuk kandang ayam terhadap pertumbuhan dan produksi sayuran A. gangetica (L.). Penelitian menggunakan Rancangan Acak Kelompok (RAK) satu faktor yaitu pupuk kandang ayam yang diberikan dalam 5 taraf perlakuan yaitu 0, 50, 100, 150, dan 200 g per tanaman dengan 3 ulangan. Peubah yang diamati meliputi karakter vegetatif dan hasil tanaman. Hasil penelitian menunjukkan pemberian pupuk kandang ayam tidak berpengaruh nyata terhadap tinggi tanaman dan jumlah cabang; berpengaruh secara nyata terhadap jumlah daun 2-8 MST, bobot basah, bobot kering dan bobot layak konsumsi tanaman A. gangetica (L.) pada panen yang pertama (5 MST) dan panen yang kedua (9 MST). Dosis 50 g per tanaman memberikan hasil paling tinggi yaitu 69,96 g., Asystasia gangetica (L.) is a detrimental weed in agricultural fields. It can be utilized as a vegetable. In Indonesia, A. gangetica is commonly known as a weed rather than a cultivated plant. This weed can be transformed into a vegetable and categorized as an introduced vegetable. A. gangetica has the potential to be commercially produced due to its nutrition content and benefits. Chicken manure is an organic fertilizer used by farmers for cultivating vegetable crops. The research was conducted at the Cikabayan Bawah Experimental Station, Bogor Agricultural University, Bogor, West Java. The purpose of this study was to investigate the effect of different doses of chicken manure fertilizer on the growth and yield of A. gangetica (L.) vegetables. The study utilized a Randomized Complete Block Design (RCBD) with a single factor, i.e. the chicken manure. It was applied at five levels: 0, 50, 100, 150, and 200 g per plant, with three replications. The variables observed included vegetative characteristics and crop yield. The study's results indicated that the application of chicken manure fertilizer did not significantly affect plant height and branch number. Chicken manure fertilizer had a significant effect on the leaf number 2-8 weeks after planting (WAP), fresh weight, dry weight, and marketable shoot weight of A. gangetica in the first harvest (5 WAP) and second harvest (9 WAP). A dose of 50 g per plant gave the highest yield, namely 69.96 g.
Keyword: bobot tanaman, panen, pupuk kandang ayam, chicken manure, harvest, plant weight

Judul: Evaluasi pemberian pupuk pada pertumbuhan dan produksi Asystasia gangetica L.
Abstrak: Penelitian ini bertujuan untuk menganalisis evaluasi pengaruh pemberian pupuk kandang dan NPK terhadap pertumbuhan dan produksi Asystasia gangetica L. Penelitiaan ini mengggunakan Rancangan Acak Lengkap dengan rincian 10 perlakuan dan 5 ulangan yaitu Kontrol (P0), Pupuk kandang 125 gram/polybag + pupuk NPK 0.125 gram/polybag (P1), Pupuk kandang 250 gram + pupuk NPK 0.125 gram (P2), Pupuk kandang 375 gram + pupuk NPK 0.125 gram (P3), Pupuk kandang 125 gram + pupuk NPK 0.188 gram (P4), Pupuk kandang 250 gram + pupuk NPK 0.188 gram (P5), Pupuk kandang 375 gram + pupuk NPK 0.188 gram (P6), Pupuk kandang 125 gram + pupuk NPK 0.250 gram (P7), Pupuk kandang 250 gram + pupuk NPK 0.250 gram (P8), Pupuk kandang 375 gram + pupuk NPK 0.250 gram (P9). Penelitian ini dilakukan selama 50 hari dengan parameter tinggi tanaman, jumlah daun, jumlah cabang, jumlah ranting, bobor segar, berat kering tanaman, dan kandungan nutrien. Analisis statistik menggunakan aplikasi SPSS. Matriks ANOVA Unbalanced, jika ada faktor yang berbeda signifikan diuji dengan uji lanjut Duncan. Hasilnya menunjukan bahwa penambahan pupuk kandang 375 gram/polybag dan pupuk NPK 0.125 gram/polybag memberikan peningkatan jumlah daun, jumlah polong biji, jumlah bunga, berat segar daun dan cabang.
Keyword: Asystasia gangetica L, hijauan, pertumbuhan, produksi, pupuk

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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