Judul: Pertumbuhan Tanaman, Produksi dan Mutu Benih Kacang Panjang sebagai Respon terhadap Pupuk Urea dan KNO3
Abstrak: Nitrogen dapat diberikan dalam bentuk nitrat atau amonium. Kalium nitrat merupakan sumber nitrogen dalam bentuk nitrat, sementara Urea dalam bentuk amonium. Penelitian ini bertujuan mendapatkan informasi pertumbuhan tanaman, produksi, dan mutu benih kacang panjang dari tanaman yang diberi pupuk N berupa KNO3 dan Urea. Penelitian dilaksanakan dalam rancangan petak terbagi dengan rancangan lingkungan acak kelompok. Jenis pupuk sebagai petak utama (KNO3 dan Urea) dan dosis N sebagai anak petak (50%, 100%, dan 150% rekomendasi). Penanaman dilakukan di Desa Darmaraja pada bulan April hingga Juni 2021. Pengujian mutu benih dilakukan di Laboratorium Penyimpanan dan Pengujian Mutu Benih IPB. Hasil penelitian menunjukkan jenis pupuk N dan dosis yang berbeda tidak mempengaruhi pertumbuhan dan perkembangan tanaman kacang panjang. Pupuk KNO3 dan dosis N tinggi (150% rekomendasi) meningkatkan hasil benih. Mutu fisiologis benih kacang panjang KP-1 tidak dipengaruhi oleh jenis pupuk N dan dosis yang diberikan. Pupuk KNO3 pada dosis yang lebih tinggi meningkatkan bobot kering dan ukuran benih., Nitrogen can be provided in the form of nitrate or ammonium. Potassium nitrate is a source of nitrogen in the form of nitrate, while Urea is in the form of ammonium. This study aims to obtain information on plant growth, production, and quality of yard-long bean seeds from plants fed with N fertilizers in the form of KNO3 and Urea. The experiment was arranged in a split-plot design with the completely randomized block design as an environmental design. The main plot was the type of N fertilizer (Urea and KNO3) and the subplots are fertilizer doses (50%, 100%, and 150% of the recommendation). Planting was carried out in Darmaraja Village from April to June 2021. Seed quality testing was carried out at the IPB Seed Storage and Quality Testing Laboratory. The results showed that the type of N fertilizer and the different doses did not affect the growth and development of yard-long beans. KNO3 fertilizer and high N dose (150% recommendation) increase seed yield. The physiological quality of KP-1 long bean seeds was not affected by the type of N fertilizer as well as the dose. KNO3 fertilizer at higher doses increased seed dry weight and seed size.
Keyword: KP-1, seed physical quality, viability, vigor

Judul: Pengaruh aplikasi pupuk organik dan pupuk anorganik terhadap pertumbuhan, produksi serta mutu benih kacang tanah (Arachis hypogaea L.)
Abstrak: The research was carried out at the Seed Science and Technology Laboratory, Soil Science Laboratory, Laboratory of Biology and Laboratory of Plant Ecology IPB Darmaga, Bogor from March to July 2006. The aim of the research was to study the effect of organic and inorganic fertilizers on growth, yield and seed quality of peanut (Arachis hypogaea L.). A single factor experiment with 9 treatments was arranged in a Randomized Block Design with 3 replications. The treatments consist of : recommended dosage of inorganic fertilizer (20 kg/ha Urea, 45 kg/ha TSP, 50 kg/ha KCI) = PI, Goat manure (5 ton/ha) = P2, combination of Goat manure (5 ton/ha) and inorganic fertilizer (20 kg/ha Urea, 45 kg/ha TSP and 50 kg/ha KCI) = P3, Rhizobium inoculant (40 g/2000 m2) = P4, combination of Rhizobium inoculant and inorganic fertilizer (10 kg/ha Urea, 22.5 kg/ha TSP and 25 kg/ha KCI) = P5, Biocompos (5 ton/ha) = P6, combination of Rhizobium inoculant (40 g/2000 m2) and Biocompos (5 ton/ha) = P7, MTM (200 g/ha) = P8, combination of MTM (200 g/ha) and inorganic fertilizer (20 kg/ha Urea, 22.5 kg/ha TSP and 25 kg/ha KCI) = P9. Results of the experiment showed that application of organic fertilizer and its combination with inorganic fertilizer could produce high seed yield similar to the recommended dosage of inorganic fertilizer, 17.30 -22.03 g /plant. However application of Rhizobium inoculant or Biocompos alone produced lower seed yield, 12.27 - 13.57 g /plant, than the recommended inorganic fertilization. MTM was the best treatment producing the highest seed yield and better performance where 4 of plant growth variables including branch number, leave width, dry and fresh weight of nodule significantly higher than those of the recommended inorganic fertilization. For seed viability and vigor as seed quality variables, there was no significant difference among the treatments.
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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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