Judul: Pertumbuhan Vegetatif dan Produktivitas Tanaman Kesum (Persicaria odarata) pada Kombinasi Media Tanam dan Jenis Pupuk Kandang yang Berbeda
Abstrak: Kesum (Persicaria odorata) adalah tanaman rempah yang memiliki banyak manfaat dan mudah dalam proses pembudidayaannya. Dalam sebuah pembudidayaan tanaman termasuk kesum, peran dari media tanam dan penyedia unsur seperti pupuk kandang sebagai pendukung pertumbuhan menjadi sangat penting. Tujuan dari penelitian ini mempelajari pertumbuhan vegetatif dan mengetahui produktivitas tanaman kesum (Persicaria odorata) pada kombinasi media tanam dan jenis pupuk kandang yang berbeda. Penelitian dimulai dari bulan Januari 2023 hingga bulan April 2023 di Gunung Batu, Bogor. Penelitian menggunakan metode rancangan kelompok lengkap teracak dua faktor. Faktor pertama yakni kombinasi media tanam, yaitu: topsoil, topsoil + arang sekam (1:1 v/v), topsoil + kompos (1:1 v/v), dan topsoil + cocopeat (1:1 v/v). Faktor kedua yakni jenis pupuk kandang, yaitu: tanpa pukan, pukan sapi, pukan kambing, pukan ayam pedaging, dengan dosis pukan 100 g/polybag. Penelitian menggunakan tiga ulangan, dan hasilnya dianalisis ragam menggunakan ANOVA serta uji lanjut DMRT dengan α 5%. Hasil percobaan menunjukkan seluruh jenis kombinasi media tanam baik menggunakan pupuk kandang ataupun tidak, dapat digunakan untuk membudidayakan tanaman kesum., The Kesum plant (Persicaria odorata) is a spice with many benefits and is easy to cultivate. In the cultivation of plants, including kesum, the role of the planting medium and providers of elements such as manure as growth support is very important. This study aims to study vegetative growth and determine the productivity of kesum plants (Persicaria odorata) in different combinations of planting media and types of manure. The study runs from January 2023 to April 2023 in Gunung Batu, Bogor. The study used the design of a randomized complete group with two factors. The first factor is the combination of planting media, namely: topsoil, topsoil + rice hull charcoal (1:1 v/v), topsoil + compost (1:1 v/v), and topsoil + cocopeat (1:1 v/v). The second factor is the type of manure fertilizer: without manure, cow manure, goat manure, and chicken manure, with a dosage of manure fertilizer 100 g/polybag. The study used three repeats, and the results were analyzed variously using ANOVA, and DMRT further tests with α 5%. The result showed that all types of combined planting media, whether using manure or not, can be used to cultivate kesum plants.
Keyword: Kesum plant, Polygonaceae, production factor, shoot cuttings

Judul: The Effect of Goat Manure Fertilizer on The Growth and Yield of Kesum (Persicaria odorata)
Abstrak: Tanaman kesum (Vietnamese mint) merupakan tanaman terna yang dimanfaatkan masyarakat sebagai bumbu penyedap dan obat. Peningkatan produksi tanaman kesum harus didukung budidaya optimum, salah satunya pemberian dosis pupuk kandang yang tepat. Penelitian ini bertujuan untuk mempelajari pengaruh dosis pupuk kandang kambing terhadap pertumbuhan dan hasil tanaman kesum. Penelitian dilaksanakan pada bulan Februari hingga April 2024 di Gunung Batu, Bogor Barat, Jawa Barat (6°35'36"S 106°46'21"E) dengan ketinggian ± 231 mdpl. Rancangan percobaan yang digunakan yaitu rancangan acak kelompok (RAK) faktor tunggal dengan 3 ulangan. Perlakuan dosis pupuk terdiri dari 5 taraf yaitu 0, 10, 20, 30 dan 40 g tanaman-1 sehingga terdapat 15 satuan percobaan. Hasil penelitian menunjukkan bahwa perlakuan dosis pupuk kandang kambing berpengaruh nyata terhadap pertumbuhan dan hasil tanaman. Dosis pupuk organik kandang kambing sebesar 40 g tanaman-1 memberikan pengaruh terbaik dalam meningkatkan produksi kesum. Tidak didapat dosis optimum karena kurva respons antara dosis 0–40 g tanaman-1 dengan semua peubah masih linier positif. Perlu penelitian dengan dosis pupuk kandang kambing lebih lanjut untuk didapat dosis optimum., The Effect of Goat Manure Fertilizer on The Growth and Yield of Kesum Plants (Persicaria odorata). Supervised by Sandra Arifin and Ahmad Junaedi. Vietnamese mint is a terna plant used by the community for seasoning and medicine. Increasing the production of Persicaria odorata must be supported by optimum cultivation, one of which is giving the right dose of manure. This research aims to study the effect of goat manure doses on the growth and yield of kesum plants. The research was conducted from February to April 2024 at Gunung Batu, West Bogor, West Java (6°35'36 "S 106°46'21 "E) with an altitude of ± 231 meters above sea level. The experimental design used was a single-factor randomized group (RAK) with 3 replications. The fertilizer dose treatment consisted of 5 levels, namely 0, 10, 20, 30, and 40 g plant-1 so there were 15 experimental units. The results showed that the dose treatment of goat manure significantly affected plant growth and yield. The dose of goat manure organic fertilizer of 40 g plant-1 had the best effect in increasing kesum production. The optimum dose was not obtained because the response curve between 0–40 g plant-1 doses with all parameters was still linear. Further research with goat manure doses is needed to get the optimum dose.
Keyword: Organic fertilizer, plant productivity, vegetative growth, vietnamese mint

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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