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: Seed Growth Response 17 Varieties of Cayenne Pepper (Capsicum frutescens L.) in The Saline Environment.
Abstrak: Cabai rawit (Capsicum frustescens L.) adalah rempah penting Indonesia dalam menu sehari-hari dan bahan dalam industri makanan sehingga fluktuasi suplai dapat menyebabkan fluktuasi harga cabai rawit di pasar. Untuk memenuhi peningkatan permintaan, perlu dilakukan ekstensifikasi ke lahan marjinal seperti tanah salin yang makin luas. Penelitian ini bertujuan untuk mengetahui respons morfologi dari 17 varietas cabai rawit terhadap kondisi salin selama masa pembibitan. Penelitian ini dilaksanakan dari Oktober sampai Desember 2019 di Rumah Kaca Kebun Percobaan Cikabayan Bawah menggunakan rancangan acak lengkap (RAL) dengan dua faktor dan tiga ulangan. Faktor pertama yang digunakan adalah salinitas yang terdiri dari dua perlakuan, yaitu konsentrasi 0 g L-1 dan 5 g L-1, dan faktor kedua adalah varietas yang terdiri dari 17 varietas meliputi Pulaipila Putih, Pulaipila Hijau, Genie, Canon, Rinta F1, Sigantung, Kara, Bhaskara, Bonita, Sona, Tripang, Merapi, Catas, Lojana, Segana, Taruna, dan CR14. Hasil penelitian ini menunjukkan bahwa cekaman salinitas menghambat pertumbuhan vegetatif bibit yang terlihat dalam tinggi tanaman, jumlah daun, panjang dan lebar daun, bobot tanaman, dan jumlah tanaman mati. Berdasarkan analisis ragam, tidak terdapat interaksi signifikan antara perlakuan cekaman salin dengan varietas cabai rawit. Hal tersebut menunjukkan tidak adanya perbedaan respons dari varietas yang diuji dengan kondisi salinitas., Cayenne pepper (Capsicum frutescens L.) is an important Indonesian spices, that used in daily menu and as ingredient in food industry as well, therefore fluctuation in supply caused price fluctuation in the market. In order to fulfill the increase demand, extensification to marginal land such as salin soil is necessary. The research aimed to elucidate morphological response of 17 varieties of cayenne pepper to salin condition during seedling stage. This experiment was conducted from October to December 2019 at Cikabayan Bawah Research Station Greenhouse, using completely randomized design (CRD) with two factors and three replications. The first factor used in this research is salinity that consist of 2 levels, which is 0 g L-1 and 5 g L-1 concentration, and second factor is variety that consist of 17 genotype of Pulaipila Putih, Pulaipila Hijau, Genie, Canon, Rinta F1, Sigantung, Kara, Bhaskara, Bonita, Sona, Tripang, Merapi, Catas, Lojana, Segana, Taruna, and CR14. The result of this research showed that salinity stress inhibit seedling vegetative growth which could be seen in plant height, number of leaves, leaves length and width, plant weight, and number of dead plant. Based on analysis of variance, there are no significant interaction between salinity condition and varieties treatment, thats indicate that no response difference of varieties to salinity condition.
Keyword: growth inhabitation, leave characters, plant weight

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.
Keyword: