Judul: Palm Oil Canopy Management (Elaeis guineensis Jacq.)  at PT Perkebunan Nusantara V Kebun Tandun Kampar Regency, Riau.
Abstrak: Magang dilaksanakan di Kebun Tandun PTPN V, Kabupaten Kampar, Riau. Kegiatan magang bertujuan menambah keterampilan aspek teknis dan manajerial perkebunan kelapa sawit terutama dalam penunasan. Pengamatan yang dilakukan meliputi sistem penunasan, kriteria dan prosedur penunasan, teknik penunasan, jumlah pelepah, pengukuran tajuk (m2 ), dan ILD. Sistem penunasan yang digunakan adalah sistem korektif untuk tanaman remaja sampai tua dan sistem periodik untuk tanaman muda. Penerapan teknik songgo sesuai SOP memiliki persentase di atas 65%. Jumlah pelepah dipertahankan berdasarkan SOP di atas 50%. Jumlah pelepah dipertahankan pada tanaman umur 4-7,7-12 dan di atas 12 tahun adalah 56-64, 48-56, dan 40-48 untuk varietas Marihat dan Socfindo. Blok J20A tanpa kondisi under pruning memiliki produksi lebih tinggi dibanding blok J24A yang mengalami kondisi under pruning mencapai 7,5%. Blok K18 dengan kondisi over pruning 25% memiliki produksi lebih baik dibanding Blok K24 dan K26 yang memiliki kondisi over pruning 37,51% dan 30,91%. Penunasan pada TM >9 tidak terlalu berpengaruh terhadap produktivitas. Varietas yang berbeda memiliki nilai ILD yang berbeda. Produksi tertinggi didapat pada varietas Asian Agri dengan nilai ILD 7,17 umur tanaman 7-12 tahun. Penunasan yang dilaksanakan belum sepenuhnya mengikuti SOP yang telah ditetapkan., The internship was held at PTPN V Kebun Tandun , Kampar Regency, Riau. The internship activity aims increase skills technical and managerial aspects of oil palm plantations, especially in pruning. Observations were made including the pruning system, criteria and procedures of pruning, pruning technique, surviving fronds, crown measurement (m2 ), and LAI. The pruning system used is corrective system for young to old plants and periodic system for young plants. The application of songgo technique to SOP based has a percentage above 65%. The surviving frondbased on compliance SOP above 50%. The surviving fronds g for plants aged 4-7, 8-13 and over 13 years are 56-65, 48-56, and 40-48 for varieties Marihat and Socfindo. Block J20A without under pruning had a better production than block J24A which experienced under pruning reaching 7.5%. Block K18 with an over pruning 25% had better production than block K24 and K26 which had an over pruning condition 37.51% and 30.91%. Pruning on plant over the age of 13 did not significantly affect productivity. Different varieties have different LAI value. The highest production was obtained at an LAI value 6.45 with a plant age of 8-13 years. Pruning carried out have not fully followes the SOP that has been set.
Keyword: pruning, LAI, surviving fronds, palm oil

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: 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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