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: Fertilization Management of Palm Oil (Elaeis guineensis Jacq.) at Inti Utara Plantation, PT Peputra Masterindo, Kampar, Riau
Abstrak: Pemupukan merupakan salah satu bagian penting dari budidaya kelapa sawit dan bertujuan menjaga tanaman kelapa sawit agar sehat sehingga berproduksi optimal. Tujuan umum kegiatan magang adalah mempelajari aspek teknis, manajerial budidaya kelapa sawit, bertujuan khusus mempelajari pemupukan kelapa sawit meliputi manajemen perencanaan, pelaksanaan, dan evaluasi pemupukan. Kegiatan magang dilaksanakan di Kebun Inti Utara Petapahan, PT Peputra Masterindo, Kabupaten Kampar, Riau, pada bulan Januari hingga Mei 2021. Pengamatan dilakukan secara langsung meliputi aspek 5 T (tepat jenis, tepat dosis, tepat waktu, tepat tempat, tepat cara), kehilangan pupuk, dan keterampilan kerja. Data yang diperoleh dianalisis secara deskriptif dan kuantitatif meliputi rata-rata (dosis, cara, tempat pemupukan, gejala defiseinsi hara), dan persentase hasil pengamatan. Hasil rata-rata diuji menggunakan t-student dan uji-f tukey pada taraf 5%. Aplikasi pemupukan tepat jenis, tepat tempat, dan tepat cara sudah dilaksanakan dengan baik sesuai standar perusahaan, tetapi pada aplikasi pemupukan tepat dosis dan waktu belum sesuai dengan standar perusahaan. Rata-rata jarak penaburan pupuk yang dilakukan sebesar 152,73 cm lebih tinggi dari standar perusahaan 150 cm pada area tanaman menghasilkan, sedangkan rata-rata 48,15 cm lebih rendah dari standar perusahaan 50 cm pada area tanaman belum menghasilkan. Realisasi waktu pemupukan masih belum sesuai dengan standar karena aplikasi pupuk selain KCl dan borate tidak dilakukan sesuai rencana. Gejala defisiensi hara yang terjadi didominasi pada unsur hara K dengan nilai 8,67% pada sampel TM dan 5,33% pada sampel TBM. Kehilangan pupuk di Kebun Inti Utara Petapahan masih dapat ditoleransi dengan nilai kehilangan 2%. Pengalaman kerja berpengaruh pada keterampilan kerja pada saat aplikasi pemupukan., Fertilization is an important part of oil palm cultivation. It is aimed at keeping the oil palm plants healthy and productive. The general objective of this activity is studying the technical and managerial aspects of oil palm cultivation. The specific objectives of studying oil palm fertilization are planning management, implementation, and evaluation of fertilization. The internship activity was undertaken at Petapahan North Core Plantation, PT Peputra Masterindo, Kampar Regency, Riau, from January to May 2021. The observation is conducted directly on 5 T aspects (right type, right dose, right time, right place, right method), fertilizer loss, and work skill. The data was analyzed descriptively and quantitatively. It included the average (dose, method, place of fertilization, symptoms of nutrient deficiency), and the percentage of observation. The average results were tested by using the t-student and Tukey's f-test at the 5% level. The application of the right fertilizer, the right place, and the right way had been implemented well according to the company standard. Meanwhile, the application of fertilizer at the right dose and time was not accordance with the company standard. The average spacing of fertilizers was 152.73 cm higher than the company's standard of 150 cm in mature plantation areas, while the average was 48.15 cm lower than the company's standard of 50 cm in immature plantation areas. The realization of fertilizing time was not up to the standard yet because the use of fertilizer other than KCl and borate was not carried out to the plan. The symptoms of nutrient deficiency were dominated by K nutrients with a value of 8.67%
Keyword: palm oil, precision, losses, work skills

Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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