Judul: The Effect of Pruning Height Difference on Three-leaved Chaste Tree (Vitex trifolia L.) Growth and Production
Abstrak: Tanaman legundi (Vitex trifolia L.) merupakan tanaman yang dimanfaatkan sebagai obat. Daun tanaman legundi mengandung flavonoid (viteksikarpin) dan minyak atsiri yang berkhasiat sebagai trakeospasmolitik, antiasma, dan repellent. Produktivitas daun perlu ditingkatkan dalam budidaya legundi, salah satunya melalui pemangkasan. Penelitian ini bertujuan mengetahui pengaruh tinggi pemangkasan berbeda terhadap pertumbuhan dan produksi legundi. Penelitian ini menggunakan rancangan tersarang (Nested) dengan faktor utama tinggi pangkasan (10 cm, 15 cm, 20 cm, tanpa pemangkasan) dari permukaan tanah dan jumlah cabang primer yang dipelihara (2 dan 3 cabang) sebagai faktor kedua yang tersarang pada faktor utama yang diulang sebanyak 3 kali yang terdiri dari 4 tanaman dalam setiap ulangannya sehingga terdapat 96 satuan percobaan. Penelitian ini menunjukan tanaman tanpa pemangkasan menunjukan hasil terbaik pada aspek pertumbuhan dan produksi, namun tanaman dengan perlakuan pemangkasan menunjukan kecepatan pertumbuhan yang lebih pesat dan berpotensi menyamai pertumbuhan tanaman tanpa pangkas. Tanaman dengan perlakuan tinggi pangkas 20 cm menunjukkan potensi terbaik pada aspek pertumbuhan dan produksi., Three-leaved chaste tree (Vitex trifolia L.) is a plant that being used as a medicine. It leaves contains flavonoid (vitexicarpin) and essential oil that can be use as tracheospasmolytic, anti asthma, and repellent. Leaves productivity on Vitex trifolia cultivation need to be improved and one of the way was by pruning. This study aims to study the effect of different pruning height on Vitex trifolia growth and production. This research consisted two factors and used nested design with 2 treatment factors. The main factor was prunning height difference (10 cm, 15 cm, 20 cm, without pruning) from the soil surface and number of remained primary branches (2 and 3 primary branches) as a second factor that nested on the main factor. This research repeated 3 times and consisted 4 plants in every repetition so that it had 96 experimental units. This research showed that the plants without pruning gave the best results in growth and production aspects, but the pruning treatment plants had faster growth and potentially surpass the without pruning plants growth. The 20 cm pruning height treatment plants potentially give the best results in growth and production aspects.
Keyword: Medicinal plant, Production, Pruning, Three-leaved Chaste Tree

Judul: The Effect of Cutting Material Types and Growing Medium Composition on the Growth of Three-leaved Chaste Tree (Vitex trifolia L.) cuttings
Abstrak: Legundi (Vitex trifolia L.) merupakan tanaman obat yang banyak digunakan dalam mengobati berbagai penyakit akan tetapi belum banyak penelitian tentang budi dayanya. Percobaan ini bertujuan mengetahui pengaruh jenis bahan setek dan komposisi media tanam terhadap pertumbuhan setek legundi di pembibitan. Percobaan menggunakan Rancangan Kelompok Lengkap Teracak dengan dua faktor perlakuan. Faktor pertama adalah bagian batang yang terdiri atas setek bagian pangkal, tengah, dan pucuk. Faktor kedua adalah media tanam yang terdiri atas media tanah, campuran media tanah + pupuk kandang sapi (1:1 v/v), dan campuran media tanah + pupuk kandang sapi + arang sekam (1:1:1 v/v). Hasil percobaan menunjukkan bahwa bahan setek berpengaruh nyata pada semua peubah yang diamati. Bagian batang yang baik yaitu bagian pangkal dan tengah. Komposisi media tanam berpengaruh nyata pada semua peubah yang diamati kecuali daya tumbuh dan jumlah tunas. Media tanam tanah memberikan hasil paling rendah. Tidak terdapat interaksi antara jenis bahan setek dan komposisi media tanam pada semua peubah yang diamati., Three-leaved chaste tree (Vitex trifolia L.) is medicinal plant to treat various diseases but there is not so many research about its cultivation. This experiment aims to determine the effect of cutting material types and growing medium composition on the growth of three-leaved chaste tree cuttings in nursery. The experiment used a Randomized Completely Block Design with two factors. The first factor is stem part consisted of basal, middle, and apical. The second factor is growing medium consisted of soil, mixture of soil + cow manure (1:1 v/v), and mixture of soil + cow manure + rice husk charcoal (1:1:1 v/v). The results showed that the cutting material significantly affected on all measured variables. The best stem part is basal and middle stem. The growing medium composition significantly affected on all measured variables except for the variables of the survival rate and shoot number. Growing medium consisted of soil gave the lowest result. There was no interaction between of cutting material types and growing medium composition on all measured variable.
Keyword: adventitious roots, Lamiaceae, rooting media, stem cuttings, vegetative propagation

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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