Judul: Growth and Productivity of Two New Superior  Varieties of Red Cayenne Pepper under Various Cultivation Technologies
Abstrak: Cabai rawit (Capsicum frutescens L.) menjadi salah satu komoditas sayuran utama di Indonesia yang memiliki nilai ekonomi tinggi. Produktivitas cabai rawit di tahun 2023 sebesar 7,79 ton ha-1 masih rendah jika dibandingkan dengan potensinya sebesar 20 ton ha-1.. Penelitian ini bertujuan mempelajari pengaruh interaksi antara perlakuan teknik budi daya dan perlakuan varietas terhadap pertumbuhan dan produktivitas, serta mengetahui perlakuan terbaik untuk meningkatkan produktivitas dari masing-masing varietas. Penelitian dilaksanakan dari bulan September 2023 hingga April 2024 menggunakan Rancangan Kelompok Lengkap Teracak (RKLT) - faktorial dengan dua faktor yaitu paket budi daya dan varietas. Perlakuan budi daya terdiri atas 5 taraf dan perlakuan varietas terdiri atas 2 taraf. Perlakuan teknologi budi daya terdiri atas kombinasi pemupukan dan perlakuan pemangkasan yang dijelaskan sebagai berikut, P1: pupuk kandang fermentasi + NPK + Gandasil + pangkas tunas lateral, P2: pupuk kandang fermentasi + NPK + Gandasil + tanpa pemangkasan, P3: pupuk kandang fermentasi + AB Mix + pangkas tunas lateral, P4: pupuk kandang fermentasi + AB Mix + tanpa pemangkasan, P5: pupuk kandang tidak difermentasi + NPK + Gandasil + tanpa pemangkasan. Dua varietas yang digunakan yaitu Bonita IPB IPB dan Feira IPB. Terdapat interaksi antara perlakuan varietas dan budi daya pada karakter jumlah buah per tanaman, bobot buah per tanaman, jumlah buah layak, dan potensi produktivitas. Perlakuan terbaik untuk varietas Bonita IPB adalah perlakuan P1 dengan potensi produktivitas sebesar 13,34 ton ha-1. Perlakuan terbaik untuk varietas Feira IPB adalah P5 dengan potensi produktivitas sebesar 12,53 ton ha-1., Red cayenne pepper (Capsicum frutescens L.) is one of the main vegetable commodities in Indonesia with high economic value. The productivity of red cayenne pepper in 2023 was 7.79 tons ha-1 which is still low compared to its potential productivity of 20 tons ha-1. This research aims to study the influence of the interaction of cultivation techniques and variety on growth and productivity, as well as to identify the best treatment to increase the productivity of each variety. The research was conducted from September 2023 to April 2024 using a Randomized Complete Block Design (RCBD) - factorial with two factors, cultivation technologies and varieties. The cultivation technologies consisted of 5 levels and the variety treatments consisted of 2 levels. The cultivation technology were a combination of fertilization and pruning treatments described as follows: P1: fermented manure + NPK + Gandasil + pruning of shoots, P2: fermented manure + NPK + Gandasil + without pruning, P3: fermented manure + AB Mix + pruning of shoots, P4: fermented manure + AB Mix + without pruning, P5: non fermented manure + NPK + Gandasil + without pruning. The two varieties used were Bonita IPB and Feira IPB. There was an interaction between variety and cultivation treatments on the characteristics of the number of fruits per plant, fruit weight per plant, number of marketable fruits and potential of productivity. The best treatment for Bonita IPB was P1, with a productivity potential of 13.34 ton ha-1. The best treatment for Feira IPB was P5, with a productivity potential of 12.53 ton ha-1.
Keyword: Pupuk, Bonita IPB, Feira IPB, Pemangkasan, Pruning

Judul: Performance and Yield Evaluation Seven Genotype of IPB Hybrid and Non Hybrid Red Cayenne Pepper (Capsicum frutescens L.)
Abstrak: Cabai rawit merah (Capsicum frutescens L.) merupakan salah satu komoditas hortikultura yang penting dan mempunyai nilai ekonomi tinggi bagi masyarakat Indonesia. Hal ini menjadikan kegiatan pemuliaan tanaman cabai rawit merah perlu untuk dilakukan. Penelitian ini bertujuan mengevaluasi keragaan dan daya hasil tiga genotipe cabai rawit merah hibrida dan empat genotipe cabai rawit non hibrida dengan 3 varietas pembanding. Penelitian dilaksanakan dari bulan September 2022 sampai Maret 2023 di Kebun Percobaan Leuwikopo IPB. Penelitian terdiri dari satu faktor yaitu genotipe (7 genotipe dan 3 varietas pembanding). Penanaman menggunakan rancangan kelompok lengkap teracak dengan tiga ulangan. Hasil penelitian menunjukkan bahwa terdapat perbedaan keragaan dan daya hasil antar genotipe cabai rawit merah. Umur berbunga semua genotipe uji berkisar 41,33-45,67 HST dengan umur panen yang berkisar antara 83,33-92,67 HST. Persentase tanaman hidup yang diamati pada akhir panen berkisar antara 37,50-70,83% dengan varietas pembanding Rawita F1 yang memiliki persentase terendah sebesar 37,50%. Genotipe F1.372340 merupakan genotipe dengan produktivitas yang paling tinggi mencapai 4,80 ton ha-1. Produktivitas genotipe tersebut masih lebih tinggi dibandingkan produktivitas varietas pembanding yang berkisar 1,48-2,72 ton ha-1. Genotipe uji memiliki daya simpan berkisar 9,30-15,00 HSP yang sama atau lebih baik daripada varietas pembanding yang berkisar 9,67-12,33 HSP., Red cayenne pepper (Capsicum frutescens L.) is one of the important horticultural commodities and has high economic value for the people of Indonesia. This makes the chili plant breeding activities necessary to do. This research aims to evaluate the performance and yield of three genotypes of hybrid red cayenne pepper and four genotypes of non hybrid red cayenne pepper with three differences varieties. The research was carried out from September 2022 to March 2023 at the Leuwikopo Experimental Garden, IPB. The research consisted of one factor, which is genotype (7 genotypes and 3 control varieties). Planting using a randomized complete block design with three replications. The results showed that there were differences in performance and yield between red cayenne pepper genotypes. The flowering ages of all genotypes ranged from 41.33-45.67 DAP with the harvest ages ranging from 83.33-92.67 DAP. The percentage of live plants observed at the end of harvest ranged from 37.50-70.83% with the Rawita F1 variety having the lowest percentage of 37.50%. The F1.372340 genotype was the genotype with the highest productivity, reaching 4.80 tonnes ha-1. The productivity of these genotypes was still higher than the productivity of the control varieties, which ranged from 1.48 to 2.72 tons ha-1. The test genotypes had shelf life ranging from 9.30-15.00 DAH which was the same or better than the control varieties which ranged from 9.67-12.33 DAH.
Keyword: cayenne pepper, evaluation, hybrid, non hybrid, productivity

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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