Judul: Vegetative Propagation of Cloves (Syzygium aromaticum) by Marcotting Method on Agroforestry Land in Ngambarsari Village, Wonogiri
Abstrak: Cengkih merupakan tanaman yang menghasilkan bunga dengan harga yang tinggi di pasar ekonomi dan banyak dibudidayakan di Indonesia, khususnya di Desa Ngambarsari, Wonogiri. Perbanyakan vegetatif cengkih dinilai lebih efektif dan unggul. Keunggulan utama dari perbanyakan vegetatif yaitu sifat bibit yang serupa dengan induknya. Salah satu perbanyakan vegetatif yang sering digunakan karena tingkat keberhasilannya tinggi pada tanaman berkayu adalah cangkok. Penelitian cangkok cengkih ini dilakukan selama 6 bulan (Desember 2021- Juni 2021) di lahan agroforestri Desa Ngambarsari, Wonogiri. Percobaan menggunakan Rancangan Acak Lengkap faktorial, dengan kombinasi perlakuan yang digunakan adalah jenis ZPT (Zat Pengatur Tumbuh) dan lama sayatan. Hasil percobaan menghasilkan cangkok cengkih berakar dengan rentang 0%-60%. Hasil sidik ragam menunjukan bahwa interaksi jenis ZPT dan lama sayatan tidak berpengaruh nyata terhadap persentase berakar, jumlah akar, dan panjang akar cangkok cengkih., Cloves are plants that produce fruit at high prices in the economic market and are widely cultivated in Indonesia, especially in Ngambarsari Village, Wonogiri. Vegetative propagation of cloves is considered more effective and superior .The main advantage of vegetative propagation is the similar nature of the seedlings to the parent. One of the vegetative propagations that is often used because of its high success rate in woody plants is marcotting. This clove marcotting research was carried out for 6 months (December 2021- June 2021) on agroforestry land in Ngambarsari Village, Wonogiri. The experiment used a factorial Complete Randomized Design, with the combination of treatments used being the type of ZPT (Growth Regulator) and the duration of the incision left. The results of the experiment produced rooted clove grafts in the range of 0%-60%. The results of the fingerprints showed that the interaction of ZPT type and incision duration was left with no noticeable effect on the percentage of roots, the number of roots, and the length of the clove graft roots.
Keyword: clove, incision left, marcotting, PGR, root

Judul: The growth of wilding cinnamomum iners and sandoricum koetjape by root cutting treatment and root and leaf’s stimulant applications
Abstrak: Pengadaan bibit dari cabutan alam seringkali mengalami hambatan karena persentase hidupnya yang rendah akibat kerusakan akar. Penelitian ini dilakukan untuk melihat daya hidup cabutan Cinnamomum iners dan Sandoricum koetjape serta melihat pengaruh penggunaan perangsang akar dan daun terhadap pertumbuhan cabutan alam. Rancangan percobaan yang digunakan adalah rancangan acak lengkap faktorial. Dua faktor perlakuan yang diujicobakan adalah faktor pemotongan akar (P) dan perangsang akar dan daun (B). Faktor P meliputi : P0 = tanpa pemotongan akar dan P1 = dengan pemotongan akar; sedangkan faktor B meliputi B0 = tanpa perangsang akar dan daun B1 = konsentrasi 2.50% B2 = konsentrasi 1.25% B3 = konsentrasi 0.83%. Pemberian perangsang akar dan daun pada Cinnamomum iners dan Sandoricum koetjape dapat meningkatkan jumlah daun dan panjang akar. Perlakuan pemotongan akar dapat meningkatkan pertumbuhan tinggi pada Sandoricum koetjape. Perlakuan yang tepat untuk meningkatkan pertumbuhan Cinnamomum iners dan Sandoricum koetjape adalah perlakuan tanpa pemotongan akar dan pemberian perangsang akar dan daun dengan konsentrasi 0.83%., Stock of the wilding often had problem because of the lower growth rate due to root damage. The objectives of this research were to consider the live rate of Cinnamomum iners and Sandoricum koetjape’s wilding and to consider the effect of root and leaf’s stimulant to the wilding’s growth. Factorial in completely randomized block design was used in this experimnent. The first factor was root and leaf’s cutting (P0 = no cutting, P1 = with cutting) and the second one was root and leaf’s stimulant application in concentration B0 = without stimulant, B1 = 2.5%, B2 = 1.25% and B3 = 0.83%. The used of root and leaf’s stimulant on Cinnamomum iners and Sandoricum koetjape’s wilding can stimulate the growth of leaves and root. The root’s cutting stimulated Sandoricum koetjape’s height. The combination treatment of root and leaf’s stimulant 0.83% and without root’s cutting showed the best effect to stimulate the growth of Cinnamomum iners and Sandoricum koetjape’s wildings.
Keyword: cabutan alam, Cinnamomum iners, perangsang akar dan daun, Sandoricum koetjape

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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