Judul: Root Distribution Study of Bonita Cayenne Peppers using the Wenner Configuration Geoelectric Method
Abstrak: Kadar air pada tanaman cabai sangat penting bagi pertumbuhan tanaman. Kebutuhan air tanaman cabai dipengaruhi oleh akar yang akan menyerap nutrisi dan air pada media tanam. Tujuan penelitian ini adalah menentukan pengaruh ukuran akar dengan tingkat resistansi dan aliran arus listrik pada tanaman cabai rawit Bonita serta menampilkan citra dari pertumbuhan akar tanaman cabai rawit Bonita. Pertumbuhan akar yang menjalar ke tanah dapat diukur melalui metode geolistrik salah satunya tomografi resistivitas listrik. Cara kerjanya adalah tingkat resistivitas sebuah bidang diukur guna mencari adanya material di dalamnya. Pengukuran menggunakan pot 0.4 m dengan ditanami benih cabai di tengahnya. Konfigurasi yang digunakan yaitu konfigurasi Wenner karena sederhana dan cocok untuk bidang yang relatif kecil. Interpretasi tahanan jenis dilakukan dengan aplikasi RES2DINV yang menghasilkan citra 2D pertumbuhan akar. Hasil citra konfigurasi Wenner menunjukan bahwa adanya pertumbuhan akar cabai dari hari ke-0 hingga hari ke-35. Nilai resistivitas akar cabai semakin besar dari hari ke hari menunjukan bahwa adanya pertumbuhan. Pertumbuhan akar kurang signifikan karena adanya pengaruh dari tegangan yang diinjeksikan saat pengukuran, tegangan listrik dapat menghambat pertumbuhan tanaman., Water content in chili plants is very important for plant growth. The water needs of chili plants are influenced by the roots that will absorb nutrients and water in the planting medium. The purpose of this research is to determine the effect of the root size with resistance levels and electric current flow in Bonita cayenne pepper plants and displays images of root growth of Bonita Cayenne Pepper plants. Root growth that spreads to the ground can be measured by one of the geoelectric method, it is electrical resistivity tomography. The way it works is the level of resistance of a plane is measured to find the material in it. Measurements using a 0.4 m pot with chili seeds that planted in the middle. The configuration used is the Wenner configuration because it is simple and suitable for relatively small fields. Interpretation of resistivity was carried out using RES2DINV application which produced a 2D image of root growth. Result of Wenner configuration image shows that there is growth of chili roots from day 0 to day 35. The resistivity value of chili roots is getting bigger from day to day. Hence, days indicate that there is growth. Root growth is less significant due to the influence of the stress injected when measurement undergo, the electric voltage can inhibit plant growth.
Keyword: Akar cabai, Konfigurasi Wenner, Pertumbuhan, Resistivitas

Judul: Effect of Soil P and K Content on Growth and Yield of Cayenne Pepper in Pangalengan  Inceptisol Soil
Abstrak: Tanaman cabai rawit (Capsicum frutescens L.) merupakan komoditas hortikultura yang bernilai ekonomi tinggi dan menjadi salah satu jenis cabai yang paling banyak ditanam di Indonesia. Produktivitas cabai rawit masih dapat ditingkatkan dengan menerapkan pendekatan teknik budidaya yang berbeda seperti menggunakan sistem irigasi dan pemupukan presisi. Penelitian ini bertujuan mengetahui kesesuaian PUTK dalam mengukur status hara P dan K tanah untuk pertumbuhan tanaman cabai rawit di tanah Inceptisol Pangalengan. Penelitian ini dilaksanakan di Rumah Plastik Kebun Percobaan Tajur PKHT IPB, Kecamatan Bogor Selatan, Kota Bogor, Jawa Barat menggunakan Rancangan Kelompok Lengkap Teracak (RKLT) dengan satu faktor berupa taraf status hara P dan K (Rendah, Sedang, Tinggi) berdasarkan perangkat uji tanah kering (PUTK). Analisis status hara P pada tanah inceptisol menggunakan PUTK terhadap tanaman cabai rawit tidak berbeda nyata antar status hara sedangkan pada status hara K menunjukkan hasil berbeda nyata. PUTK dapat digunakan untuk menentukan status hara K pada tanaman cabai rawit., Cayenne pepper (Capsicum frutescens L.) is a horticultural commodity with high economic value and is one of the most widely planted tipes of chili in Indonesa. The productivity of cayenne pepper can still be increased by adopting a different approach on cultivation technique such as using irrigation system and precision fertilization. This study aims to determine the suitability of PUTK in measuring soil P and K nutrient status for growth of cayenne pepper in Pangalengan Inceptisol soil. This research was conducted at the Plastic House of the Tajur Experimental Garden PKHT IPB, South Bogor District, Bogor City, West Java using Randomized Complete Block Design (RCBD) with one factor in the form of levels of P and K nutrient status (Low, Medium, High) based on soil test kits (PUTK). Analysis of P nutrient status on inceptisol soil using PUTK on cayenne pepper was not significantly different between nutrient statuses while the K nutrient status showed significantly different results. The soil test kits can be used to determine the nutrient status of K in cayenne pepper plants.
Keyword: Analisis, Bonita, PUTK, Rekomendasi, Analysis, Bonita, Recommendation

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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