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: 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.
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