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: Evaluation of Variability and Yield on Cayenne Pepper Genotypes (Capsicum frutescens L.) Collection of PKHT IPB
Abstrak: Cabai rawit (Capsicum frutescens L.) merupakan hortikultura yang bernilai ekonomi tinggi di Indonesia. Tingginya permintaan akan meningkatkan permintaan produktivitas tanaman. PKHT IPB memiliki koleksi beberapa sumberdaya genetik cabai rawit yang perlu dievaluasi keragaman genetik dan karakteristik genotipenya untuk pengembangan selanjutnya. Penelitian ini bertujuan mengevaluasi keragaman dan daya hasil genotipe cabai rawit koleksi PKHT IPB. Penelitian dilaksanakan pada bulan Desember 2021 sampai Juni 2022 di Kebun Percobaan Pasir Kuda. Sembilan genotipe (HCR 17-002, HCR 17-003, HCR 17-006, HCR 17-009, CRP 2, CRP 4, CRP 5, CRP 7, dan Bonita) disusun menggunakan Rancangan Kelompok Lengkap Teracak (RKLT) dengan tiga ulangan. Terdapat keragaman karakter kualitatif genotipe uji, kecuali bentuk penampang batang, posisi dan bentuk bunga, serta bentuk biji. Analisis sidik ragam menunjukkan keragaman antara genotipe yang dievaluasi, kecuali diameter batang, jumlah buah per tanaman, bobot buah per tanaman, dan persentase jumlah buah rusak per tanaman. HCR 17-003 menunjukkan karakter lebar buah, bobot buah, jumlah biji per buah, bobot 1000 biji, dan bobot buah per tanaman yang lebih tinggi dibandingkan dengan varietas Bonita, serta bobot buah per bedeng dan produktivitasnya sebanding dengan varietas Bonita. HCR 17-006 memiliki panjang buah yang lebih panjang dibandingkan dengan varietas Bonita dan CRP 7 memiliki jumlah buah per tanaman yang lebih banyak dibandingkan dengan varietas Bonita., Cayenne pepper (Capsicum frutescens L.) is high economic value horticultural in Indonesia. The high demand for demand increase of crop productivity. PKHT IPB has a collection of genetic resources of cayenne pepper that the genetic variability and genotype characteristics need to evaluate for further development. This study aimed to evaluate the diversity and yield components of the PKHT IPB’s cayenne pepper. The research was conducted from December 2021 to June 2022 at PKHT IPB Pasir Kuda Experimental Field. Nine genotypes (HCR 17-002, HCR 17-003, HCR 17-006, HCR 17-009, CRP 2, CRP 4, CRP 5, CRP 7, and Bonita) were arranged under a Randomized Complete Block Design (RCBD) with three replications. The genotype qualitative characteristics varied except to the stem cross-sectional shape, the flower shape and position, and the seed’s shape. The analysis of variance showed a significant difference among evaluated genotypes except for stem diameter, fruits number per plant, fruit weight per plant, and percentage of defect fruit per plant. HCR 17-003 showed fruit width, fruit weight, the number of seeds per fruit, 1000 seeds, and the weight of fruit per plant higher than the Bonita variety, and weight per plot and productivity compare to Bonita's. HCR 17-006 has a longer fruit length than the Bonita variety and CRP 7 has a greater number of fruits per plant than the Bonita variety.
Keyword: productivity, qualitative character, quantitative character

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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