Judul: Manajemen Pemangkasan Pelepah Kelapa Sawit di Kebun Cikasungka Distrik Jawa Barat Banten KSO PTPN III
Abstrak: Kelapa sawit (Elaeis guineensis Jacq.) merupakan komoditas perkebunan penyumbang devisa terbesar bagi negara dibandingkan komoditas perkebunan lain seperti karet dan teh. Pemeliharaan pada kelapa sawit perlu diperhatikan untuk menjaga produktivitas tanaman, salah satunya pemangkasan pelepah. Kegiatan magang dilaksanakan di Kebun Cikasungka Distrik Jawa Barat Banten KSO PTPN III. Kegiatan magang bertujuan meningkatkan pemahaman keterampilan teknis dan manajemen tanaman kelapa sawit, serta mempelajari dan menganalisis kegiatan manajemen pemangkasan pelepah tanaman kelapa sawit di perkebunan. Pengamatan dilakukan pada beberapa aspek mengenai pemangkasan pelepah. Sistem pemangkasan yang diterapkan adalah sistem pemangkasan progresif, yang di Afdeling 1 masih belum terlaksana dengan maksimal. Teknik pemangkasan pelepah yang dilakukan adalah songgo 1 dengan rata-rata di 86,8%.Jumlah pelepah dipertahankan yang sesuai, yaitu 40-48 pelepah memiliki rata-rata 52,17%, di blok A1 mencapai 59,2%, A4 62,1%, dan A12 35,2%. Jumlah bunga dan produktivitas tanaman kelapa sawit berkaitan erat dengan jumlah pelepah yang dipertahankan, semakin sesuai jumlah pelepah dengan peraturan, semakin baik hasil yang didapat., Palm oil (Elaeis guineensis Jacq.) is a plantation commodity that has the largest foreign exchange earner for the country compared to other plantation commodities. Maintenance of oil palm needs to be considered to maintain plant productivity, one of which is pruning. The internship activity was carried out at Cikasungka Gardens West Java District Banten KSO PTPN III. The internship aims to improve the understanding of technical skills and management of oil palm plants, as well as to study and analyze oil palm frond pruning management activities in plantations. Observations were made on several aspects about pruning. Pruning system implemented is pruning progressive system, which in Afdeling 1 has not been implemented optimally. The pruning technique used is songgo 1 with average at 86.8%. The number of fronds that maintained, namely 40-48, in block A1 reached 59.2%, A4 62.1%, and A12 35.2%. The number of flowers and productivity of oil palm plants is closely related to the number of fronds that are maintained, the more in accordance with the number of fronds with regulations, the better the results obtained.
Keyword: Elaeis guineensis Jacq, number of fronds, pruning system, pruning technique, palm oil

Judul: Manajemen Pemupukan Kelapa Sawit (Elaeis guineensis Jacq.) di Kebun Cikasungka KSO PTPN III Distrik Jawa Barat Banten
Abstrak: Salah satu faktor yang mempengaruhi produksi crude palm oil adalah kegiatan pemupukan. Magang bertujuan mengetahui manajemen pemupukan kelapa sawit di perkebunan milik negara dan memahami kondisi lapangan. Kegiatan magang dilaksanakan pada Februari-Juni 2023 di Kebun Cikasungka Distrik Jawa Barat Banten Kerja Sama Operasional (KSO) PTPN III. Magang dilakukan dengan menjadi karyawan harian lepas (KHL), pendamping mandor, dan pendamping asisten afdeling. KHL melakukan semua aspek teknis di kebun, pendamping mandor membantu pengawasan pekerja dan aspek teknis, serta pendamping asisten afdeling membantu terkait aspek manajerial. Pengambilan data primer pada blok A2, A3, dan A4 selama 5 hari dilakukan dengan mengamati KHL pemupukan berkaitan takaran pupuk pokok-1 (320 unit pengamatan), jarak taburan terhadap pangkal pokok (320 unit pengamatan), alat yang digunakan (20 unit pengamatan), metode aplikasi pupuk (320 unit pengamatan), dan dosis tandan kosong ha-1 (blok A1 dengan 3 ulangan) serta mengamati mandor berkaitan kehadiran selama pemupukan. Data sekunder ketepatan waktu pemupukan diambil dari laporan perusahaan 2017-2023. Hasil pengamatan menunjukkan bahwa pelaksanaan pemupukan belum berjalan optimal. Perolehan ketepatan aplikasi dosis pupuk dan jarak aplikasi NPKMg 13.6.27.4 memiliki persentase 128% dan 39,03%. Waktu pemupukan NPKMg di Afdeling 1 memiliki ketepatan 66,7%. Alat pemupukan dan cara aplikasi memiliki kesesuaian 100%. Kehadiran mandor memiliki persentase 100%., Fertilization can affect crude palm oil production. The internship aims to know the management of oil palm fertilization in owned state plantations and understand field conditions. Internship activities were carried out in February- June 2023 at the Cikasungka Plantation. The internship is carried out by becoming a KHL perform all technical aspects, a foreman assistants help supervise workers, and a field assistant assistants help with managerial aspects. Primary data on blocks A2, A3, and A4 for 5 days was obtained by observing KHL related to the rate of fertilizer stand-1 (320 observation units), the distance of fertilizer to the stem base (320 observation units), the tools used (20 observation units), the method of fertilizer application (320 observation units), and the dose of empty bunches ha-1 (block A1 with 3 replications), and observing the foreman attendance during fertilization. Secondary data for fertilization timeliness was taken from the company report 2017-2023. Observations showed that the implementation of fertilization had not been optimal. The accuracy of fertilizer dose application and application distance of NPKMg 13.6.27.4 was 128% and 39.03%. The timing of NPKMg fertilization in Afdeling 1 had 66.7% accuracy. Fertilization tools and application methods had 100% conformity. The foreman attendance had 100% percentage.
Keyword: dose, fruit set, fruit to bunch, foreman, NPKMg

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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