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: 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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