Judul: Aplikasi Tandan Kosong dan POME sebagai Pupuk Organik pada Tanaman Kelapa Sawit (Elaeis guineensis Jacq.) di Kebun Inti Petapahan PT Peputra Masterindo, Kampar, Riau
Abstrak: Pengolahan minyak kelapa sawit dari tandan buah segar (TBS) akan menghasilkan limbah tandan kosong dan lumpur berupa solid dan Palm Oil Mill Effluent (POME). Limbah tersebut dapat digunakan sebagai pupuk organik pada area perkebunan. Kegiatan magang dilaksanakan di Kebun Inti Petapahan PT Peputra Masterindo, Kampar, Riau pada tanggal 18 Januari sampai 17 Mei 2021. Kegiatan magang bertujuan untuk meningkatkan keterampilan teknis dan manajerial perkebunan kelapa sawit dengan bekerja secara langsung di lapangan serta mendalami aspek pemanfaatan limbah kelapa sawit. Pengamatan aspek khusus yang dilakukan meliputi kegiatan pemeliharaan blok kontrol, aplikasi tandan kosong dan aplikasi POME, ketepatan dosis pupuk organik, sex ratio, serta produktivitas blok kontrol, aplikasi tandan kosong dan aplikasi POME. Kegiatan pemeliharaan blok terdapat perbedaan pada pemberantasan gulma di gawangan sedangkan pada rencana pemupukan anorganik tidak terdapat perbedaan. Ketepatan dosis pupuk organik di Kebun Inti Petapahan belum sesuai dosis rekomendasi setiap tahunnya. Sex ratio dan produktivitas selama 3 bulan (Januari-Maret) pada tahun 2021 menunjukkan blok aplikasi POME berbeda nyata lebih tinggi daripada blok kontrol, sedangkan blok aplikasi tandan kosong tidak berbeda nyata baik dengan blok kontrol maupun dengan blok aplikasi POME., Processing of palm oil from fresh fruit bunches will produce waste as empty fruit bunches and mud in the form of solid and POME. The waste can be used as organic fertilizer in plantation areas. The internship activity was carried out at the Petapahan Nucleus Plantation of PT Peputra Masterindo, Kampar, Riau on January 18 to May 17, 2021. The internship aims to improve technical and managerial skills of oil palm plantations by doing activities directly as a worker and exploring aspects of the utilization of oil palm waste. Observations of the specific aspects contained control block maintenance activities, empty bunches application and POME application, accuracy of organic fertilizer dosage, inflorescence sex ratio, as well as productivity at the control block, empty bunches application and POME application. There are differences in the block maintenance activities in weeds control in the gates area, while in inorganic fertilization application there is no difference dosage. The accuracy of the dosage of organic fertilizer in the Petapahan Nucleus Plantation is not eventually in accordance with the recommended portion per year. Observation on sex ratio and productivity for 3 months (January-March) in 2021 showed that POME application block are significantly higher than that of the control block, whereas on empty bunch application area has no significant with the POME application block, as well as with control blocks.
Keyword: fresh fruit bunch, productivity, sex ratio, waste

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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