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 NPK Fertilizer on The Growth and Yield of Vietnamese Coriander (Persicaria odorata)
Abstrak: Kesum (Persicaria odorata) merupakan tanaman terna tahunan yang memiliki banyak manfaat dalam bidang kesehatan dan kuliner. Pembudidayaan tanaman kesum tidak lepas dari peran media tanam sebagai penyedia hara untuk menyokong pertumbuhan tanaman kesum. Salah satu cara untuk memenuhi ketersediaan hara adalah dengan menambahkan pupuk anorganik. Tujuan dari penelitian ini mempelajari pertumbuhan vegetatif dan produktivitas tanaman kesum dengan dosis pupuk NPK 16:16:16 yang berbeda. Penelitian dimulai dari bulan Januari hingga bulan April 2024 di Gunung Batu, Bogor. Penelitian menggunakan metode rancangan acak kelompok dengan satu faktor. Faktor perlakuan berupa dosis pupuk NPK 16:16:16 yang berbeda, yaitu: 0 (kontrol), 2, 4, dan 6 g/polybag. Penelitian menggunakan tiga ulangan setiap satuan percobaan terdiri dari dari tiga polybag dan hasil analisis ragam menggunakan ANOVA serta uji lanjut DMRT dengan a 5%. Hasil penelitian menunjukkan pemberian dosis pupuk NPK yang berbeda tidak memberi pengaruh nyata terhadap pertumbuhan vegetatif dan produksi tanaman kesum. Pemberian dosis pupuk tertinggi dengan dosis 6 g per polybag memiliki hasil tertinggi pada semua peubah kecuali jumlah daun pada 8 MST., Vietnamese coriander is a perennial herb known for its numerous benefits in both health and culinary applications. Vietnamese coriander cultivation is inseparable from the role of growing media as a nutrient provider to support the growth of Vietnamese coriander. One way to meet nutrient availability is by adding fertilizer. The research aims to study the growth and productivity of Vietnamese coriander with different doses of NPK 16:16:16 fertilizer. The research started from January to April 2024 in Gunung Batu, Bogor, Indonesia. The study used a randomized complete block design with one factor. The treatment NPK fertilizer, namely: 0(control), 2, 4, and 6 g/polybag. The research used three replications, each unit consisted of 3 polybags, and the results were analyzed for variance using ANOVA and further tested with DMRT at a 5% significance level. The research showed that giving 6 g/polybag NPK significantly increased the leaf area and color of the Vietnamese coriander as a leaf vegetable plant. NPK fertilizer at a dose of 6 g/polybag had the highest results for all variables except the leaf number at 8 WAP. However, giving different doses to Vietnamese coriander did not affect the overall weight of Vietnamese coriander plants.
Keyword: NPK Fertilizer, Stem cuttings, Vegetative growth, Vietnamese coriender

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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