Judul: Application of Gandasil D Foliar Fertilizer on the Growth and Yield of Four Accessions of Katuk (Sauropus androgynus (L.) Merr.)
Abstrak: Katuk memiliki banyak manfaat dan berpotensi memenuhi kebutuhan pangan keluarga. Penelitian ini mengevaluasi pengaruh perbedaan aksesi dan aplikasi pupuk daun Gandasil D terhadap pertumbuhan dan produksi tanaman katuk (Sauropus androgynus (L.) Merr.). Perlu dilakukan penelitian untuk mengetahui keragaman aksesi dan pengaruh aplikasi pupuk daun terhadap pertumbuhan dan produksi terbaik. Rancangan yang digunakan adalah petak tersarang dengan dua perlakuan pupuk (kontrol, dipupuk daun) tersarang dalam empat aksesi (Ciaruteun Ilir 1, Pager Jangkung 1, Ciaruteun Ilir 2, Pager Jangkung 2). Aksesi Ciaruteun Ilir 1 dan Aksesi Pager Jangkung 1 secara umum menunjukkan pertumbuhan dan produksi yang lebih besar dari aksesi lainnya. Aksesi Ciaruteun Ilir 1 menunjukkan hasil paling tinggi pada parameter jumlah cabang dan panjang cabang panen. Aksesi Ciaruteun Ilir 1 menghasilkan bobot panen per bedeng lebih banyak dari aksesi Ciaruteun Ilir 2 dan aksesi Pager Jangkung 2 tetapi tidak berbeda dengan aksesi Pager Jangkung 1. Aksesi Pager Jangkung 1 menunjukkan jumlah daun dan jumlah cabang yang lebih banyak dari aksesi Pager Jangkung 2 tetapi tidak berbeda dengan aksesi Ciaruteun Ilir 1 dan aksesi Ciaruteun Ilir 2. Aksesi Ciaruteun Ilir 1 dan aksesi Pager Jangkung 1 menunjukkan estimasi bobot panen per hektar yang lebih tinggi dari aksesi lainnya, yaitu masing-masing sebesar 1333,8 kg ha-1 dan 1131,6 kg ha-1. Penambahan pupuk daun Gandasil D mampu meningkatkan pertumbuhan dan produksi tanaman katuk. Pengaruh interaksi Aksesi Ciaruteun Ilir 1 dan dipupuk daun menunjukkan panjang cabang panen yang paling tinggi., Katuk (Sauropus androgynus (L.) Merr.) has numerous benefits and potential to meet family food needs. This study evaluates the effects of different accessions and foliar application of Gandasil D fertilizer on the growth and production components of katuk. Research is needed to understand the diversity of accessions and the impact of foliar fertilizer application on optimal growth and production. A nested plot design was used with two fertilizer treatments (control, foliar fertilized) nested within four accessions (Ciaruteun Ilir 1, Pager Jangkung 1, Ciaruteun Ilir 2, Pager Jangkung 2). Results showed that Ciaruteun Ilir 1 and Pager Jangkung 1 generally have higher growth and yield compared to other accessions. Accession Ciaruteun Ilir 1 showed the highest results in the parameters of the number of branches and the length of harvested branches. This accession produced a higher harvest weight per bed than Accession Ciaruteun Ilir 2 and Accession Pager Jangkung 2, but there was no significant difference compared to Accession Pager Jangkung 1. Accession Pager Jangkung 1 exhibited a greater number of leaves and branches compared to Accession Pager Jangkung 2 but showed no significant difference compared to Accession Ciaruteun Ilir 1 and Accession Ciaruteun Ilir 2. Accession Ciaruteun Ilir 1 and Accession Pager Jangkung 1 demonstrated an estimated harvest weight per hectare that was higher than the other accessions, with 1333.8 kg ha-1 and 1131.6 kg ha-1, respectivelyAdding foliar application of Gandasil D significantly increased growth and production of katuk. Effect of interaction between Ciaruteun Ilir 1 and foliar fertilized resulted in highest harvest branch length.
Keyword: aksesi, pupuk daun, katuk, accession, foliar fertilizer, Sauropus androgynus

Judul: Response of Shade and Fertilizer Dosage on Growth and  Yield of Katuk (Sauropus androgynus (L.) Merr.).
Abstrak: Katuk (Sauropus androgynus (L.) Merr.) adalah salah satu jenis sayuran indigenous di Indonesia yang memiliki potensi untuk dikembangkan sebagai sayuran alternatif untuk memenuhi kebutuhan nutrisi. Penelitian ini bertujuan untuk mengetahui pengaruh intensitas naungan dan dosis pupuk yang sesuai guna meningkatkan pertumbuhan dan hasil produksi katuk. Percobaan dilakukan menggunakan Rancangan Kelompok Lengkap Teracak (RKLT) faktor Split plot dengan petak utama adalah naungan dan anak petak adalah dosis pemupukan. Intensitas naungan terdiri dari 4 taraf, yaitu N0 (tanpa naungan), N1 (naungan 55%), N2 (naungan 65%), dan N3 (naungan 75%). Dosis pemupukan juga terdiri dari 4 taraf, yaitu P1 (50 kg ha-1), P2 (100 kg ha-1), P3 (150 kg ha-1), dan P4 (200 kg ha-1). Penelitian dilakukan dengan 3 ulangan sehingga diperoleh 16 kombinasi, dengan 48 satuan percobaan. Hasil penelitian menunjukkan tidak terdapat interaksi antara naungan dan dosis pemupukan. Perlakuan tunggal dosis pemupukan tidak memberikan pengaruh terhadap seluruh parameter pengamatan. Perlakuan naungan berpengaruh terhadap seluruh peubah pengamatan kecuali pada diameter batang saat pengamatan 2 MST dan 3 MST. Bobot panen komersial yang dipanen pada 8 MST mencapai hasil optimum pada aplikasi naungan 65%. Kata kunci: paranet, sayuran indigenous, dan sayuran komersial, Katuk (Sauropus androgynus (L.) Merr.) is one of the indigenous vegetables in Indonesia which has the potential to be developed as an alternative vegetable to meet nutritional needs. This study aims to determine the effect of shade intensity and appropriate dose of fertilizer to increase growth and yield of katuk production. The experiment was carried out using a completely randomized block design (RKLT) with split plot factors with the main plot being shaded and sub-plots being the dose of fertilization. Shade intensity consisted of 4 levels, namely N0 (without shade), N1 (55%), N2 (65%), and N3 (75% shade). The fertilization dose also consisted of 4 levels, namely P1 (50 kg ha-1), P2 (100 kg ha-1), P3 (150 kg ha-1), and P4 (200 kg ha-1). The study was conducted with 3 replications so that 16 combinations were obtained, with 48 experimental units. The results showed that there was no interaction between shade and fertilization dose. Single treatment of dose fertilization did not give effect on all parameter of observation. Shade treatment affected all observation variables except for stem diameter at 2 WAP and 3 WAP. Commercial harvest weights harvested at 8 WAP achieved optimum yields at 65% shading applications. Keywords: commercial vegetable, indigenous vegetable, and paranet
Keyword: commercial vegetable, indigenous vegetable, paranet

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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