Judul: Budidaya tebu (Saccharum officinarum L.) lahan kering di PG Madukismo PT Madubaru Yogyakarta dengan aspek khusus pemupukan beberapa kategori tanaman tebu lahan kering
Abstrak: The internship was conducted at PG Madukismo PG Madubaru Yogyakarta beginning 14 February 2012 to 15 Mei 2012. The special purpose is study fertilization of some category of upland sugarcane at PG Madukismo PT Madubaru Yogyakarta. Fertilization in PG Madukismo is important because one in order to achieve high productivity is a good fertilizer. Most of the fields in the PG Madukismo was upland. There are two types of cultivated sugar cane that is PC (Plant Cane) and RC (Ratoon Cane) Fertilizer used in PG Madukismo is the dose recommended by the P3GI and considered by PG Madukismo and farmers. Parties responsible for the extraction of manure from the barn to the application to sugarcane was foreman and field assistant. Dosage fertilizer for PC (Plant Cane) are 11 ku/ha Madros, 5 ku/ha ZA and 5 ku/ha Phonska while for RC (Ratoon Cane) are 5 ku/ha ZA and 5 ku/ha Phonska. The data obtained were analyzed using t-test. From the results obtained for plants PC or RC I obtained the best productivity of sugarcane grown on land that has a typology mild soil type, irrigation well (pump) and the current drainage there are Kledokan field in Magelang which have productivity 598 ku /ha and Sikendal field in Temanggung which have productivity 693 ku/ha.
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Judul: Sugarcane Management (Saccharum officinarum L.) at Madukismo Sugar Factory with Special Aspects Inorganic Fertilization Efficiency
Abstrak: Gula merupakan salah satu komoditas penting yang keberadaannya sangat dibutuhkan dari skala rumah tangga sampai skala industri. Budidaya tebu yang baik akan berpengaruh terhadap produksi gula yang optimal. Pupuk menjadi salah satu input penting dalam kegiatan budidaya tebu, sehingga aplikasi dosis pemupukan harus dilakukan dengan baik sehingga menciptakan efisiensi yang diinginkan. Magang ini bertujuan meningkatkan kemampuan profesional dalam memahami proses kerja nyata dan menganalisis efisiensi pemupukan anorganik pada budidaya tebu lahan kering. Dilaksanakan di PT Madubaru PG Madukismo, Bantul, Kasihan, Yogyakarta dari 24 Januari sampai 24 Mei 2022. Dosis pemupukan yang dilakukan tidak berbeda nyata pada ketiga varietas (PS 862, KK, dan BL). Nilai efisiensi teknis tertinggi terdapat pada kebun dengan varietas BL dengan dosis total pupuk 940 kgha-1, setiap satu kg pupuk efisien terhadap peningkatan 0,654 ku hasil. Efisiensi biaya menurut analisis usaha tani menunjukkan bahwa kebun dengan varietas BL paling efisien dengan nilai R/C 1.47.
Keyword: dosis pemupukan, efisiensi pemupukan, nilai R/C

Judul: Kekonsistenan Hamiltonian pada Gerak Gelombang Interfacial
Abstrak: The interfacial wave is an internal wave that occurs at boundary of two layers fluid. It appears because there is difference of mass density between the two layers. The objective of this thesis is to formulate the motion of internal wave with flat base and flat as well as free upper bound surface. The motion equation obtained is a Hamiltonian system. The Hamiltonian in this system is expressed by variable of wave deviation and horizontal component of potential velocity. Under assumption that interfacial wave moves only in one direction, it can be shown that the Hamiltonian depends on the solution of the wave motion equation. The coefficients of the equation depend on the physical characteristics of the two layers of fluid, i.e. thickness and mass density. The numerical results show that Hamiltonian in the system is constant. It is consistent with Hamiltonian characteristic, which does not depend on time.
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