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: Analysis of Variations in PKHT IPB’s Cayenne Pepper Genotypes Collected from Blitar
Abstrak: Cabai rawit (Capsicum frutescens L.) merupakan salah satu komoditas yang dibudidayakan secara luas dan bernilai ekonomi tinggi di Indonesia. Tingginya permintaan cabai rawit mendorong upaya untuk meningkatkan produktivitas tanaman. Perakitan varietas baru merupakan salah satu upaya untuk meningkatan hasil. Salah satu tahap awal dari perakitan varietas baru yaitu eksplorasi dan karakterisasi plasma nutfah. Tujuan dari penelitian ini adalah mengkarakterisasi keragaman fenotipe cabai rawit aksesi Blitar koleksi PKHT IPB berdasarkan karakter morfologi dan daya hasil. Penelitian dilaksanakan dari bulan Desember 2020 hingga Juli 2021 di Kebun Percobaan Pasir Kuda. Penelitian ini menggunakan rancangan kelompok lengkap teracak (RKLT) satu faktor, yaitu genotipe cabai rawit dan diuji lanjut dengan Tukey Beda Nyata Jujur. Hasil penelitian menunjukkan adanya keragaman pada 20 karakter kualitatif dan seluruh karakter kuantitatif yang diamati. Perbedaan karakter kualitatif genotipe uji dengan varietas pembanding terdapat pada warna daun, posisi buah, dan bentuk potongan membujur buah. Hasil analisis sidik ragam menunjukkan bahwa genotipe berpengaruh nyata terhadap semua karakter kuantitatif yang diamati. KCR5 dan KCR7 memiliki bobot buah per tanaman yang lebih tinggi dibanding varietas pembanding, Cayenne pepper (Capsicum frutescens L.) is one of the most widely cultivated and economically important commodities in Indonesia. The high demand for cayenne pepper has spurred efforts for higher-yielding crops. Breeding a new cultivar is one of the efforts to increase plant productivity. One of the early stages of breeding a new cultivar is germplasm exploration and characterization. The objective of this research was to characterize the phenotypic variation among PKHT IPB’s cayenne pepper collected from Blitar based on morphological traits and yield components. The research was carried out from December 2020 to July 2021 at PKHT IPB Pasir Kuda Experimental Station. The experiment was performed using single factor cayenne pepper genotypes under a randomized complete block design (RCBD), subsequently, Tukey’s Honest Significant Difference test was used to reveal differences among genotypes. The results showed there were variations in 20 qualitative and all quantitative characters. Differences in qualitative characteristics between the commercial cultivar used as a comparison and tested genotypes are in leaf color, fruit position, and fruit shape in the longitudinal section. Analysis of variance revealed that genotype has a significant effect on all observed quantitative characters. KCR5 and KCR7 have a higher yield than the commercial cultivar used in this experiment.
Keyword: bobot, daya hasil, karakterisasi, morfologi, pemuliaan

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: