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: Pengaruh Jenis Pupuk terhadap Pertumbuhan dan Hasil Empat Varietas Cabai (Capsicum annuum L.)
Abstrak: Cabai (Capsicum annuum L.) merupakan tanaman yang memiliki nilai ekonomi yang tinggi. Tingginya permintaan konsumsi cabai mendorong dilakukannya upaya budidaya untuk meningkatkan kualitas dan produktivitas cabai. Pemberian pupuk yang tepat merupakan salah satu upaya untuk menghasilkan kualitas karakter yang unggul dan produktivitas tinggi. Percobaan dilakukan di Kebun Percobaan PKHT Tajur 2 IPB pada bulan Januari hingga Juli 2021. Percobaan menggunakan rancangan perlakuan petak terbagi dalam rancangan kelompok lengkap teracak. Petak utama yaitu varietas: Harita IPB, Shiara, Genie dan Bara. Anak petak yaitu pemupukan: P1 (NPK 16:16:16 + gandasil B/D), P2 (NPK 15:15:15), P3 (AB mix). Varietas Harita IPB memiliki umur berbunga dan umur panen yang lebih cepat dibandingkan varietas lainnya. Varietas Shiara memiliki ukuran buah dan bobot buah lebih besar dari varietas lainnya. Jenis pupuk tidak berpengaruh nyata terhadap peubah yang diamati kecuali umur panen dan bobot buah. Varietas menunjukkan keragaman dalam umur berbunga, tinggi tanaman, ukuran dan bobot buah. Respon varietas terhadap jenis pupuk menunjukkan perbedaan yang nyata pada umur panen, ukuran daun dan diameter buah. Cabai varietas Bara memberikan produktivitas yang paling tinggi. Kata kunci: pemupukan, produktivitas, varietas, Chilli pepper is a plant that has high economic value. The high demand for consumption of chilli pepper encourages cultivation efforts to improve the quality and productivity of chilli pepper. Appropriate fertilizer application is one of the efforts to produce superior character quality and high productivity. This study was conducted at experimental stasion of PKHT Tajur 2 IPB from January to July 2021. Experiment was arranged in a split plot with randomized complete block design . Main plot factors was on varieties: Harita IPB, Shiara, Genie and Bara. The subfactors was on application of fertilizer: P1 (NPK 16:16:16 + gandasil B/D), P2 (NPK 15:15:15), P3 (AB mix). The Harita IPB variety has a faster flowering and harvesting age than other varieties. The Shiara variety has larger fruit size and fruit weigh than other varieties. Varieties showed diversity in flowering age, plant height, fruit size and weight. The response of varieties to the type of fertilizer showed significant differences in harvest age, leaf size, and fruit diameter. Bara variety gave the highest productivity. Keywords: fertilization, productivity, variety
Keyword: fertilization, productivity, variety

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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