Judul: Pelaksanaan pemupukan tanaman tebu (Saccharum officinarum L.) lahan kering di PT Gula Putih Mataram Lampung
Abstrak: PT. Gula Putih Mataram merupakan perkebunan tebu dan pabrik gula milik perusahaan swasta yang terletak di Lampung Tengah berjarak ± 144 km dari Bandar Lampung. Total areal perkebunan dan pabrik gula adalah 40 788.33 ha, tanah didominasi oleh tanah Ultisol dan termasuk iklim tipe B menurut Schmidt dan Ferguson. Tanah Ultisol memiliki kemasaman tinggi, kandungan bahan organik dan unsur hara yang rendah. Untuk mengatasi masalah tersebut dilakukan pemupukan, penambahan bahan organik dan pengapuran. Pemupukan dilaksanakan dua kali yaitu pada saat tanam dan pada saat tanaman berumur 1.5-2.0 bulan dengan menggunakan pupuk Urea (46% N), SP 36 (36% P₂Os) dan KCI (60%K2O). Dosis pupuk yang digunakan ditentukan berdasarkan hasil analisis tanah dan daun. Dalam kondisi yang mendukung, pemupukan dilaksanakan dengan Fertilizer applicator. Bahan organik yang digunakan adalah blotong dan abu bagas dengan dosis 50 ton/ha yang diaplikasikan sebelum pengolahan tanah secara manual. Kegiatan pengapuran dilaksanakan sebelum penanaman. Bahan yang digunakan adalah dolomit dengan dosis 1.5 ton/ha. Dolomit diaplikasikan secara manual dengan cara tebar di alur tanam. Berdasarkan hasil analisis tanah, tanah di areal PT. Gula Putih Mataram memiliki pH <5.5, C-organik <2.0%, N <2.0%, P tersedia 10.92 ppm (sub soil), K, Ca dan Mg dapat dipertukarkan masing-masing <0.2, <0.9 dan ≤3.0 meq/100g dan KTK ≤9.0. Hara yang terkandung dalam tanaman berdasarkan hasil analisis berada pada kisaran 1.59-1.78%N, 0.57-0.62 %P2O5 dan 1.72-1.86 %K₂O. Dengan demikian, konsentrasi hara dalam tanaman berada dalam kisaran kecukupan sampai berlebih.
Keyword: Agronomy, Sugar cane

Judul: Pengelolaan tebu (Saccharum officinarum L.) di PT Gula Putih Mataram, Lampung Tengah dengan aspek khusus aplikasi blotong pada tanaman tebu lahan kering
Abstrak: Internship activities was be held in PT Gula Putih Mataram, Lampung Central 15 March until 15 July 2010. The purpose of this internship is to learn the techniques of sugarcane cultivation in dry land. The method is the direct and indirect methods. to specific aspects of application management filtercake observed. Observations made among others, the shape and nature of filtercake, filtercake per hectare needs, priorities of land given filtercake, the process of transporting filtercake from the factory, how the spread of filtercake in the fields, and observing the effect on sugarcane crop. Filtercake is the result of solid waste in processing sugarcane juice purification. Filtercake shaped like land and having the main content of C (35.52 %), N (0.82 %), P (0.97 %), K (0.26 %), Ca (1.83 %), Mg (0.23 %), dan S (0.09 %) . Filtercake needs for one hectare of land is 40 tons. However, based on field observations the average amount filtercake are given per hectare of land that is 54.60 tons. Priority determination of land based on mileage dumptruck from the factory (< 10 km). Filtercake applied directly to the land by way of land sown before processing. Transportation of filtercake is using dumptruck with a capacity of 8-10 tons. Spread of filtercake by using human power with a capacity of 24-30 kg/person. Observations indicate that the application of filtercake did not effect significantly on the growth of sugarcane crop. Filtercake application is intended to overcome the sugar mill waste, so that less attention filtercake application techniques.
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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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