Judul: Effect of Grafting Models on Durian Plants Growth (Durio
zibethinus Murr.).
Abstrak: Durian (Durio zibethinus Murr.) merupakan salah satu tanaman hutan yang memiliki permintaan pasar cukup tinggi, akan tetapi ketersediaan bibit berkualitas masih rendah sehingga pengembangan bibit durian perlu ditingkatkan dengan melakukan perbanyakan secara vegetatif, salah satunya dengan metode sambungan (grafting). Penelitian bertujuan mengetahui pengaruh model grafting terhadap keberhasilan dan pertumbuhan grafting durian di Rumah Kaca Rumpin Seed Source Nursery Center (RSSNC). Penelitian menggunakan metode Rancangan Acak Lengkap (RAL) dengan 3 ulangan yang terdiri atas 1 faktor yaitu model grafting dengan perlakuan berupa model baji di atas (G1), model sisip di atas (G2), model baji di bawah (G3), dan model sisip di bawah (G4). Berdasarkan hasil penelitian perlakuan model grafting memberikan pengaruh yang berbeda nyata terhadap persentase keberhasilan grafting, jumlah tunas, dan panjang tunas. Persentase keberhasilan tertinggi hingga terendah berturut-turut yaitu dihasilkan oleh perlakuan G4 sebesar 73% dengan rincian 63% grafting bertunas dan 17% grafting hidup, perlakuan G3 sebesar 53% dengan rincian 33% grafting bertunas dan 20% grafting hidup, serta perlakuan G2 sebesar 20% grafting bertunas dan G1 sebesar 7% grafting bertunas., Durian (Durio zibethinus Murr.) is one of the forest plants that have high market demand, but the availability of quality seedlings is still low. Hence, the development of durian seedlings needs to be improved by vegetative propagation, one of which is the grafting method. The study aims to determine the effect of grafting models on the success and growth of durian grafting in the Rumpin Seed Source Nursery Center (RSSNC) Greenhouse. This study used a completely randomized design (CRD) method with 3 replications consisting of 1 factor, namely the grafting model with treatments in the form of the top cleft model above (G1), the side model above (G2), the top cleft model below (G3), and the side model below (G4). Based on the research results, the grafting model treatment had a significantly different effect on the percentage of grafting success, number of shoots, and shoot length. The highest to lowest percentage of success in a row is produced by the G4 treatment of 73% with details of 63% sprout grafting and 17% live grafting, G3 treatment of 53% with details of 33% sprout grafting and 20% live grafting, and G2 treatment of 20% sprout grafting and G1 of 7% sprout grafting.
Keyword: Durian, Grafting, Model baji, Model sisip

Judul: Studi Keberhasilan Grafting Jati (Tectona grandis L.f)
Abstrak: Jati merupakan salah satu jenis kayu komersial yang banyak diminati. Jati yang unggul dapat dipertahankan dengan teknik vegetatif grafting. Salah satu kendala pada grafting yaitu inkompatibilitas batang atas (scion) dan batang bawah (rootstock). Oleh karena itu, diperlukan penentuan umur pohon induk, umur dan kondisi scion sebagai bahan grafting. Penelitian ini bertujuan menguji sumber scion terhadap keberhasilan grafting jati. Percobaan pertama menggunakan scion yang cenderung tua dan tidak diketahui umurnya. Percobaan kedua menggunakan scion berumur 8 hari. Percobaan ketiga menggunakan scion dari bibit Jati Plus Perhutani berumur 8 bulan. Penelitian dilakukan di Taman segitiga Departemen Silvikultur (DSVK) dan Rumah Kaca DSVK IPB pada bulan April hingga Juni 2022. Prosedur penelitian diawali dengan pemilihan rootstock, pemilihan scion, penyambungan, pemeliharaan, hingga analisis data. Penyambungan dilakukan dengan metode sambung sisip dan top cleft grafting pada percobaan pertama dan kedua. Percobaan ketiga hanya menggunakan metode top cleft grafting. Rancangan yang digunakan adalah RAL (rancangan acak lengkap) satu faktor dengan perlakuan A (teras rumah kaca) dan B (dalam rumah kaca). Data dianalisis dengan software SAS 9.0. Hasil penelitian menunjukkan percobaan pertama dan kedua mengalami kegagalan total. Adapun percobaan ketiga total persentase keberhasilan sebesar 20,84%., Superior teak can be maintained with vegetative grafting techniques. One of the obstacles to grafting is the incompatibility of scions and rootstocks. Therefore, it is necessary to determine the age of the seed trees, the age and condition of the scion as a grafting material. This study aims to test the source of scion against the success of teak grafting. The first experiment used a scion which tends to be old and its age is unknown. The second experiment used an 8-day-old scion. The third experiment used scion from 8-month-old Perhutani Jati Plus seedlings. The study was conducted in the Triangular Park of the Silviculture Department (DSVK) and the DSVK IPB Greenhouse in April to June 2022. The procedure begins with rootstock selection, scion selection, splicing, maintenance, and data analysis. Splicing is carried out by the method of connecting the insert and top cleft grafting in the first and second experiments. The third experiment used only the top cleft grafting method. The design used was a one-factor RAL (complete random design) with treatment A (greenhouse terrace) and B (in greenhouse). The data was analyzed with SAS 9.0 software. The results showed that the first and second experiments failed miserably aand third experiment, the total success percentage was 20.84%.
Keyword: grafting, jati, rootstock, scion

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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