Judul: Harvesting Management of Oil Palm (Elaeis guineensis  Jacq.) in Utara Petapahan Plantation, PT Peputra Masterindo, Kampar, Riau.
Abstrak: Kelapa sawit merupakan salah satu komoditas perkebunan penting sebagai sumber pemasukan devisa Negara Indonesia. Keberhasilan panen akan menunjang peningkatan produktivitas tanaman sehingga kegiatan pemanenan kelapa sawit merupakan salah satu kegiatan yang penting dalam pengelolaan perkebunan kelapa sawit. Kegiatan magang dilaksanakan di Kebun Utara Petapahan, PT Peputra Masterindo, Kampar, Riau pada tanggal 18 Januari hingga 17 Mei 2021. Kegiatan magang memiliki tujuan untuk menambah pengetahuan, memperoleh pengalaman, dan keterampilan kerja tentang budidaya kelapa sawit dengan aspek khusus yang diamati tentang manajemen pemanenan kelapa sawit. Aspek khusus yang diamati meliputi perencanaan panen, pelaksanaan panen, dan evaluasi panen. Data pengamatan dianalisis secara kuantitatif dan deskriptif dengan menggunakan rata rata, persentase, serta uji komparasi (t-student). Kegiatan pemanenan di Kebun Utara Petapahan sudah berjalan cukup baik, terlihat dari hasil produksi harian yang sesuai dengan taksasi produksi dengan nilai varian rata-rata di bawah 5% dan muatan panen pada alat truk yang sudah sesuai kapasitas. Walaupun demikian beberapa hal masih perlu diperbaiki dan ditingkatkan seperti rotasi panen yang masih panjang, pengadaan alat pelindung diri (APD) kaca mata dan kepatuhan dalam penggunaan helm yang masih dibawah angka 100%, mutu buah busuk yang sudah diatas standar sebesar 1,69% dari batas toleransi 1% , kapasitas pemanen rata-rata masih belum mencapai basis panen, kehilangan hasil berupa berondolan yang tidak terkutip dan buah matang tidak dipanen masih ditemukan pada saat pemeriksaan hanca., Oil palm is one of the important plantation commodities as a source of income for Indonesian. The successful harvest will support to increased the productivity, so oil palm harvesting is an important activity in management of oil palm plantations. Internship was held at Utara Petapahan Plantation, PT Peputra Masterindo, Kampar, Riau from January 18th until May 17th 2021. The internship activity aims to increase knowledge, gain experience and work skills about oil palm cultivation with specific aspects observed about harvest management of oil palm. Specific aspects that were observed included harvest planning, harvest implementation, and harvest evaluation. Observation data were analyzed quantitatively and descriptively using averages, percentages, and a comparative test (t-student). Harvesting activities in Utara Petapahan plantation have been running quite well, as seen from the daily production results in accordance with production estimates with an average variant value of below 5% and the fruit transportation with trucks are compatible with capacity. However several things still need to be improved such as harvesting rotation which is still long, procurement of personal protective equipments (PPE) for glasses and compliance with helmet use which is still below 100%, the quality of rotten fruit that has been above the standard is 1.69% of the tolerance limit 1%, average harvesting capacity is still has not reached the basis of harvest, lost yields have been found from not collected fruit and ripe fruit that wasn’t harvested are still found during the region inspection.
Keyword: capacity harvester, harvesting management, harvest planning, oil  palm, capacity harvester, harvesting management, harvest planning, oil palm

Judul: Harvesting Management of Palm Oil (Elaeis guineensis Jacq.) in Negeri Lama Selatan Estate, PT Hari Sawit Jaya, Labuhanbatu, North Sumatera
Abstrak: Panen merupakan salah satu kegiatan yang penting pada pengelolaan tanaman kelapa sawit. Keberhasilan panen dicapai dengan menghasilkan produktivitas tandan buah yang tinggi dengan kandungan rendemen minyak yang tinggi serta kandungan asam lemak bebas (ALB) yang rendah sehingga manajemen panen harus dilaksanakan secara optimal. Kegiatan magang mempelajari manajemen pemanenan kelapa sawit yaitu perencanaan panen, pengorganisasian panen, pelaksanaan panen, dan evaluasi panen. Kegiatan magang dilaksanakan di Kebun Negeri Lama Selatan, PT Hari Sawit Jaya, Labuhanbatu, Sumatera Utara mulai bulan Januari hingga Mei 2022. Kegiatan magang bekerja secara langsung sebagai pekerja harian lepas (PHL), pendamping mandor, dan pendamping asisten afdeling untuk mempelajari aspek teknis dan manajerial. Manajemen panen merupakan aspek khusus yang diamati dalam kegiatan magang. Rotasi panen terpanjang mencapai 13 hari, sedangkan standar perusahaan adalah 10 hari. Penggunaan alat pelindung diri (APD) tergolong cukup baik. Kapasitas panen terdapat perbedaan yang signifikan karena pekerja memperoleh basis harian yang ditetapkan. Rata-rata AKP sebesar 20,18% dan rata-rata varian sebesar 2,41%. Kebutuhan tenaga panen diperoleh taksasi sebesar 15,61 dan realisasi sebesar 14,20. Transportasi panen relatif singkat dengan rata-rata waktu yang ditempuh 12,13 menit, rata-rata jarak 2,16 km, dan rata-rata kecepatan 10,88 km jam-1. Persentase mutu buah sesuai dengan standar perusahaan dengan tidak ada buah mentah, buah matang 96,74%, buah terlalu matang 2,55%, dan buah busuk 1,71%. Kehilangan hasil di lapangan sebesar 1,88 butir pokok-1. Penerapan sistem evaluasi, denda, dan premi panen dilakukan untuk menjaga tercapainya basis dan kualitas panen., Harvesting is one of the most important activities in oil palm management. Successful harvesting is achieved by producing high fruit bunch productivity with high oil yield and low free fatty acid (FFE) content, so harvest management must be carried out optimally. The internship studies oil palm harvesting management, namely harvest planning, harvest organization, harvest implementation, and harvest evaluation. The internship was carried out at Negeri Lama Selatan Estate, PT Hari Sawit Jaya, Labuhanbatu, North Sumatera from January to May 2022. Interns work directly as casual daily workers, accompanying field supervisor, and accompanying afdeling assistant to learn technical and managerial aspects. Harvest management is a specific aspect observed in the internship. The longest harvest rotation reached 13 days, while the company standard is 10 days. The use of personal protective equipment (PPE) is quite good. There is a significant difference in harvesting capacity because workers get a set daily basis. The average plant harvest density (AKP) is 20.18% and the average variance is 2.41%. The demand for harvesters was estimated at 15.61 and realized at 14.20. Harvest transportation is relatively short, with an average time taken of 12.13 minutes, an average distance of 2.16 km, and an average speed of 10.88 km h-1. The percentage of fruit quality is in accordance with company standards, with no unripe fruit, 96.74% ripe fruit, 2.55% overripe fruit, and 1.71% rotten fruit. The yield loss in the field was 1.88 loose fruit plant-1. A system of evaluation, penalty, and harvest reward was implemented to maintain the achievement of yield basis and quality.
Keyword: harvest labor, harvest maturity criteria, harvest rotation, yield loss

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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