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: Fertilization Management of Palm Oil (Elaeis guineensis Jacq.) in Tandun Estate, PT Perkebunan Nusantara V, Kampar, Riau
Abstrak: Kegiatan magang dilaksanakan di Kebun Tandun, PTPN V pada tanggal 24 Januari hingga 24 Mei 2022. Kegiatan pemupukan sebagai salah satu kegiatan pemeliharaan dapat menjadi upaya dalam peningkatan produktivitas kelapa sawit. Efisiensi dan efektivitas pemupukan dapat tercapai dengan penerapan konsep lima tepat (5T) yaitu tepat jenis, tepat dosis, tepat waktu, tepat cara, dan tepat sasaran. Tujuan kegiatan magang untuk mempelajari manajemen pemupukan pada tanaman kelapa sawit yang berlokasi di Kebun Tandun, PT Perkebunan Nusantara V, Kabupaten Kampar, Riau. Hasil pengamatan menunjukkan bahwa pelaksanaan pemupukan sudah didasarkan pada kaidah 5T (tepat jenis, tepat dosis, tepat waktu, tepat cara, dan tepat tempat) dan sesuai dengan standar yang terdapat dalam Instruksi Kerja (IK) perusahaan, terlihat dari seluruh ketepatan mencapai nilai >90%. Ketidaksesuaian waktu pemupukan dengan rencana diakibatkan oleh tidak tersedianya pupuk di gudang. Perusahaan juga telah melaksanakan pemupukan sesuai dengan kriteria ISPO dan RSPO., The internship activity was carried out at Tandun Estate, PTPN V from January 24 to May 24, 2022. Fertilization activities as one of the maintenance activities can be an effort to increase palm oil productivity. The fertilization efficiency and effectiveness can be achieved by applying the rules of 5 Tepat (5T), namely the right type, the right dose, the right time, the right method, and the right place. The internship aimed to study the fertilization management on palm oil plantations in Tandun Estate, PT Perkebunan Nusantara V. Observations showed that the application of fertilization was based on the 5T rules (right type, right dose, right time, right method, and right place) and in accordance with the company’s standards operation procedures, seen from all accuracy reaching a value of >90% . The mismatch of fertilization time with the plan was caused by the unavailability of fertilizer in the warehouse. The company has also maintained the application of fertilization in accordance with ISPO and RSPO criteria.
Keyword: ISPO, kaidah 5T, RSPO

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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