Judul: The Effects of Biocontrol Application on Production of Four Varieties of Chilli Pepper (Capsicum spp.) for Industries
Abstrak: Cabai rawit merupakan komoditas yang penting bagi masyarakat Indonesia. Penelitian ini bertujuan mengetahui pengaruh aplikasi biokontrol terhadap karakter produksi pada empat varietas cabai rawit sehingga didapatkan rekomendasi varietas cabai dengan karakter produksi terbaik dan agen biokontrol terbaik. Penelitian dilaksanakan pada bulan Desember 2018 sampai dengan bulan Juli 2019 di Kebun Percobaan 2 PKHT (Pusat Kajian Hortikultura Tropika) Institut Pertanian Bogor, Tajur, Bogor dan di Laboratorium Pasca Panen, Departemen Agronomi dan Hortikultura, Fakultas Pertanian IPB. Rancangan percobaan yang digunakan adalah Split Plot RKLT (Rancangan Kelompok Lengkap Teracak) dua faktor. Petak utama adalah varietas cabai rawit yang terdiri dari empat taraf yaitu Rinta (R1), Kara (R2), Lentera (R3), dan Dewata (R4). Faktor kedua menjadi anak petak adalah perlakuan biokontrol yang terdiri dari empat taraf yaitu tanpa biokontrol (P0), Prima Gard (P1), PGPR Rhizomax (P2), dan kombinasi antara Prima Gard dengan Rhizomax (P3). Karakter produksi varietas Rinta, Kara, Lentera dan Dewata dapat ditingkatkan dengan memberikan perlakuan Rhizomax secara tunggal atau dikombinaksikan dengan Primagard. Varietas Lentera memiliki karakter produksi terbaik diikuti oleh varietas Kara. Produktivitas cabai rawit varietas Lentera pada penelitian ini mencapai 11,07 ton ha-1. Perlakuan biokontrol juga efektif menekan kejadian penyakit yang menyerang selama penelitian berjalan., Cayenne pepper is an important commodity for the people of Indonesia. This study aimed to determine the effects of biocontrol applications on the production of four varieties of cayenne pepper so that the recommendations regarding chili varieties with the highest production and the best biocontrol agent could be obtained. The research was carried out from December 2018 to July 2019 at the PKHT 2 Experimental Station (Center for Tropical Horticulture Studies), IPB University, Tajur, Bogor and at the Post-Harvest Laboratory, Department of Agronomy and Horticulture, Faculty of Agriculture, IPB University. The experimental design used was a two-factor split plot randomized complete block design. The main plot was the variety of cayenne pepper consisting of four levels, namely Rinta (R1), Kara (R2), Lentera (R3), and Dewata (R4). The second factor being a subplot was the biocontrol treatment consisting of four levels, namely without biocontrol (P0), Prima Gard (P1), PGPR Rhizomax (P2), and the combination of Prima Gard and Rhizomax (P3). The production of the Rinta, Kara, Lentera and Dewata varieties can be increased by giving Rhizomax treatment alone or in combination with Primagard. Lentera variety has the highest production followed by Kara variety. The productivity of Lentera chili varieties in this study reached 11,07 tons ha-1. The biocontrol treatment was also effective in suppressing the incidence of disease during the study.
Keyword: Plant Growth Promoting Rhizotobacter (PGPR), Pseudomonas sp., Bacillus sp., Cryptococcus sp.

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: 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: