Judul: Cultivation, Harvest, and Postharvest of Cut Foliage Monstera deliciosa LIebm, Cordyline fruticosa (L.) A.Chev., and Asparagus virgatus Baker at PT Pesona Daun Mas Asri, Bogor, Jawa Barat
Abstrak: Produksi daun potong merupakan industri yang sedang berkembang di Indonesia; daun potong digunakan untuk rangkaian bunga dan dekorasi. Kegiatan magang dilaksanakan di PT Pesona Daun Mas Asri selama 4 bulan dimulai 24 Januari hingga 24 Mei 2022. PT Pesona Daun Mas Asri merupakan kebun pembibitan khususnya untuk produksi daun potong. Magang bertujuan untuk meningkatkan wawasan dan kemampuan mahasiswa pada aspek teknis dan manajerial pengelolaan perusahaan pertanian. Magang juga menambah kemampuan mahasiswa dalam berinteraksi dengan karyawan kebun, meningkatkan wawasan mahasiswa pada pemasaran daun potong di pasar bunga secara langsung, serta meningkatkan networking mahasiswa. Kegiatan magang meliputi kegiatan teknis produksi dan manajerial, mulai dari penanaman, panen, hingga penanganan pascapanen daun potong. Teknik budi daya, panen, hingga pascapanen yang tepat diperlukan untuk memperoleh daun potong berkualitas. Pertumbuhan tanaman dari ketiga spesies juga diamati setiap minggu selama 7 minggu selama 4 bulan magang dilaksanakan. Daun Monstera deliciosa dapat dipanen pada minggu ke 5 dan panen selanjutnya 2-3 minggu kemudian sejak daun baru tumbuh, daun Cordyline fruticosa dapat dipanen pada minggu ke 3 selanjutnya 2-3 minggu kemudian sejak daun baru tumbuh, sedangkan daun Asparagus virgatus dapat dipanen pada minggu ke 7 dan panen selanjutnya 7 minggu setelah anakan baru tumbuh. Budi daya daun potong M. deliciosa dan C. fruticosa dilakukan pada shadehouse paranet, sedangkan budi daya A. virgatus dilakukan pada shadehouse plastik UV. Penanganan pascapanen terdiri dari pembersihan, sortasi, grading, dan pengemasan. Tangkai daun potong dilapisi kapas basah untuk menjaga kesegaran daun potong. Sistem pemasaran daun potong terdiri dari pelanggan trader dan pelanggan end user., Cut foliage production is a growing industry in Indonesia; they are used mainly for floral arrangements and indoor decoration. An internship was conducted at PT Pesona Daun Mas Asri for 4 months starting from 24th January until 24th May 2022. PT Pesona Daun Mas Asri is a nursery that specializes in the production of tropical foliages. The internship aimed to expand student knowledge and practical experience on technical and managerial aspects of managing an agricultural farm. The internship can improve student ability in interaction between farm employee, improve student knowledge about cut foliages marketing system in flowers market, also improve student networking with others. The internship activities include technical and managerial activities, from production, harvest, and postharvest of the cut foliages. Cultivation, harvest, and postharvest techniques are needed to obtain quality of cut foliage. Plant growth of the three species were measured every week for 7 weeks during the 4 months internship. Monstera deliciosa leaves can be harvested on the 5th week and the next harvest in 2-3 weeks after the new leaves grow, Cordyline fruticosa can be harvested on the 3rd week and the next harvest in 2-3 weeks after the new leaves grow, meanwhile Asparagus virgatus leaves can be harvested on the 7th week and the next harvest in 7 weeks after the new tillers grow. M. deliciosa and C. fruticosa are grown in shadehouses with net roof, while A. virgatus grown under shadehouses with UV plastic roof. Postharvest handling consists of cleaning, sorting, grading, and packaging. The stalks of cut foliage are covered by wet cotton to maintain the
Keyword: filler, leaf ornamental plants, production, marketing system

Judul: Manajemen Produksi dan Pascapanen Daun Potong Asparagus  umbellatus Link, Philodendron xanadu Croat, Mayo & J.Boos, dan Phlebodium aureum (L.) J. Sm. di Kwekerij Figaro B.V., Naaldwijk, Belanda Selatan
Abstrak: Kegiatan magang dilaksanakan di Kwekerij Figaro selama empat bulan, mulai 1 Maret hingga 31 Juni 2023. Kegiatan magang bertujuan untuk meningkatkan pengetahuan dan keterampilan mahasiswa secara teknis dan manajerial khususnya dalam budidaya, penanganan panen dan pascapanen daun potong Asparagus umbellatus, Philodendron xanadu, dan Phlebodium aureum yang terdapat di Kwekerij Figaro. Metode yang digunakan dalam kegiatan magang adalah metode langsung dengan melakukan pengamatan secara langsung di lapang serta mengikuti semua kegiatan teknis budidaya tanaman hias daun mulai dari penanaman sampai pascapanen. Metode tidak langsung dilakukan dengan mempelajari data sekunder, berupa arsip perusahaan, laporan perusahaan dan studi psustaka. Berdasarkan hasil kegiatan magang diketahui bahwa tanaman hias daun dibudidayakan di dalam greenhouse agar dapat disesuaikan dengan suhu optimal dan kondisi pertumbuhan untuk tanaman. Total luas lahan greenhouse perusahaan seluas 21.200 m², dengan pembagian area produksi Asparagus umbellatus seluas 8.800 m² (41,5%) dapat memproduksi hingga sebanyak 86.650 tangkai dalam periode 1 bulan, Philodendron xanadu sebesar 1920 m² dapat memproduksi hingga sebanyak 50.480 tangkai dalam periode 1 bulan, dan Phlebodium aureum sebesar 480 m² dapat memproduksi hingga sebanyak 12.200 tangkai dalam periode 1 bulan. Setelah panen, daun potong disimpan dalam cooling room pada suhu 12℃. Kualitas daun potong yang dihasilkan oleh Kwekerij Figaro serta rantai pemasaran yang baik membuat 99,40% produksi dapat dipasarkan. Setelah mengikuti kegiatan magang ini, mahasiswa mendapat keterampilan teknik budidaya, panen dan pasca panen khususnya penentuan kriteria panen, pembuatan buket Asparagus umbellatus dan alur produksi ketiga spesies daun potong., The internship was conducted at Kwekerij Figaro for four months, from March 1 to June 31, 2023. The internship aimed to improve students' knowledge and skills technically and managerially, especially in cultivation, harvest handling and postharvest of cut foliage of Asparagus umbellatus, Philodendron xanadu, and Phlebodium aureum at Kwekerij Figaro. The method used in internship activities was direct method by making direct observations in the field and following all technical activities of leaf ornamental crop cultivation from planting to postharvest. The indirect method is carried out by studying secondary data, in the form of company archives, company reports, and literature studies. Based on the results of internship activities, it is known that ornamental plants are cultivated in the greenhouse to provide optimal temperature and growing condition for the crops. The total area of the company's greenhouse is 21.200 m², with the division of Asparagus umbellatus production area of 8.800 m² (41,5%) can produce up to 86.650 stems, Philodendron xanadu of 1.920 m² can produce up to 50.480 stems, and Phlebodium aureum of 480 m² can produce up to 12.200 stems, all in a period of 1 month. After harvesting, cut leaves are stored in a cooling room at 12°C. The good quality of cut leaves produced by Kwekerij Figaro and a good marketing chain make 99,40% of production marketable. After participating in this internship, students obtained skills in cultivation, harvesting and post-harvest techniques, specifically in determining harvesting criterias, Asparagus umbellatus bouquet making and production flows of the three species of cut foliage.
Keyword: cut foliage, leaf ornamental crop, greenhouse, production

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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