Judul: Pengaruh Media Tanam dan Zat Pengatur Tumbuh Sitokinin (BA) terhadap Perbanyakan Tunas Pisang Raja Bulu (Musa Paradisiaca L.) dari Cacahan Bonggol.
Abstrak: Banana is the important and the highest production of Indonesian fruits. The propagation of banana using corm pieces known as the cheap and effective method, that also gives diseases resistance to shoots. Furthermore, this research aimed to determine the effect of growing media types and doses of BA to increase the healthy shoots and to make the propagation of Raja bulu banana from corm pieces faster. Research used Randomize Complete Block Design (RKLT) with two factors. The first factor were cytokines (BA) with four dosages (A1:10 ppm, A2:10 ppm, A3:20 ppm, and A4:30 ppm). The second factor was growing media composition consisting of B1: soil, B2: husk charcoal, B3: husk charcoal + soil, B4: and husk charcoal + cow manure. The results showed that no interaction between media and cytocines, except from dead corm percentage at 9 weeks after planting. The media's treatment only affected the variable number of buds on the hump, number of roots, number of root corms, number of roots of the root corms, and the dead corm percentage. The most number of buds on the hump was obtained from the husk charcoal + cow manure media at 2 weeks after planting. The highest of roots on 9 weeks after planting, the highest of root corms on 7 weeks after planting, and the highest of roots of the root corms on 9 weeks after planting were obtained from the husk charcoal media. The highest dead corm percentage was obtained from the soil media at 9 weeks after planting. Cytokines BA did have no significant influence to plantain bud multiplication of Raja bulu banana from corm pieces.The pests and diseases in the soil were reduced by using of husk charcoal + cow manure media. Hence, it was suggested to use husk charcoal + cow manure media without application of cytokines to produce Raja bulu banana’s shoots.
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Judul: Influence of Potassium on Growth of Raja Bulu Banana (Musa sp. AAB group) in Bogor, West Java
Abstrak: This experiment was conducted to assess the effect of potassium chloride fertilizer doses differences on growth of Raja Bulu banana in Kampung Ciherang Kaum, Ciherang Village, Kecamatan Darmaga, Bogor, West Java since December 2007 until June 2008. This experiment based on Fully Randomized Group Design with one factor, potassium chloride doses, which consist of 0 g/plant, 100 and 225 g/plant, 200 and 450 g/plant, 300 and 675 g/plant, and 400 dan 900 g/plant. Each treatment were repeated three times. The Raja Bulu banana used in this research were planted from three months old suckers. The fertilizer was applied twice, at 2 Months After Planting (MAP) and 5 MAP. The fertilizer was spread around banana plant and then piled with soil. Potassium chloride doses applied did not affect the height, leaf number and sucker number of Raja Bulu banana. They also did not affect the plant girth of Raja Bulu banana, except at 35 and 37 Weeks After Planting (WAP). Raja Bulu banana which fertilized with 200 and 450 g/plant potassium chloride significantly had the biggest plant girth at 35 and 37 WAP. The result of Raja Bulu banana leaf chemical analysis showed that the doses of potassium chloride applied were not enough to supply the Raja Bulu banana need of potassium. The conclusion of this experiment is that application of potassium chloride until 400 and 900 g/plant did not affect Raja Bulu bananas growth., Penelitian ini dilakukan untuk mengetahui pengaruh pemberian pupuk KCl terhadap pertumbuhan pisang Raja Bulu yang dilaksanakan di kebun pisang di Kampung Ciherang Kaum, Desa Ciherang, Kecamatan Darmaga, Bogor, Jawa Barat pada bulan Desember 2007 – Juni 2008. Percobaan menggunakan rancangan kelompok lengkap teracak satu faktor, yaitu dosis pupuk KCl yang terdiri dari 0 g/tanaman, 100 dan 225 g/tanaman, 200 dan 450 g/tanaman, 300 dan 675 g/tanaman, serta 400 dan 900 g/tanaman. Percobaan ini diulang sebanyak tiga kali, sehingga terdapat 15 satuan percobaan. Pisang Raja Bulu yang digunakan berasal dari anakan bonggol berumur tiga bulan. Pemupukan dilakukan saat 2 Bulan Setelah Tanam (2 BST) dan 5 BST. Pemupukan dilakukan dengan cara menabur pupuk di sekeliling tanaman dan kemudian ditimbun dengan tanah. Perlakuan dosis pupuk KCl yang diberikan tidak berpengaruh terhadap tinggi tanaman, jumlah daun dan jumlah anakan tanaman pisang Raja Bulu. Perlakuan dosis pupuk KCl juga tidak berpengaruh terhadap lingkar batang tanaman pisang Raja Bulu, kecuali pada 35 dan 37 MST. Pada 35 dan 37 MST, tanaman pisang Raja Bulu dengan perlakuan dosis pupuk KCl 200 dan 450 g/tanaman secara signifikan memiliki lingkar batang yang lebih besar dibandingkan perlakuan lainnya. Hasil analisis kimia pada daun pisang Raja Bulu menunjukkan bahwa perlakuan dosis pupuk KCl hingga 400 dan 900 g/tanaman menghasilkan kandungan kalium pada daun pisang yang masih berada di bawah batas kecukupan. Hal ini mengindikasikan bahwa kalium yang diberikan belum memenuhi kebutuhan kalium tanaman pisang Raja Bulu. Dari percobaan ini dapat disimpulkan bahwa perlakuan dosis KCl sampai dengan 400 dan 900 g/tanaman tidak berpengaruh terhadap pertumbuhan pisang Raja Bulu.
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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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