Judul: Improvement Contribution and Efficiency Estimation in Application of "Precipalm" Fertilizer Dosage Recommendation at PT Kalimantan Agro Nusantara, East Kutai, East Kalimantan
Abstrak: Asesmen lapangan dilaksanakan di PT Kalimantan Agro Nusantara, Kebun Nusantara, Kutai Timur, Kalimantan Timur pada bulan Januari 2020 sampai April 2020. Kegiatan studi bertujuan mengestimasi neraca nitrogen untuk mengetahui jejak nitrogen dan efisiensi penerapan dosis pemupukan nitrogen Precipalm pada perkebunan kelapa sawit. Estimasi neraca nitrogen di PT KAN Kebun Nusantara kondisi pra pemupukan diperoleh -85.67 kg N ha-1 tahun-1, sedangkan untuk kondisi pasca pemupukan diperoleh untuk kedua perlakuan dosis pemupukan baik PPKS dan Precipalm sebesar 23.56 kg N ha-1 tahun-1 dan 25.24 kg N ha-1 tahun-1. Defisit N terjadi pada kondisi pra pemupukan jika tidak mempertimbangkan input sumber dan proses dekomposisi alami akibat dari tidak adanya pemupukan selama dua tahun terakhir, sedangkan pada kondisi pasca pemupukan terjadi surplus N untuk kedua perlakuan. Jejak nitrogen produksi diperoleh untuk pra pemupukan sebesar 1.45 kg N ton TBS-1 serta untuk pasca pemupukan perlakuan PPKS dan Precipalm sama besar yaitu 3.19 kg N ton TBS-1 3.22 kg N ton TBS-1. Data jejak nitrogen produksi menunjukkan bahwa dinilai pada parameter jejak nitrogen keadaan tidak dipupuk lebih ramah lingkungan dibandingkan dengan keadaan setelah dipupuk. Estimasi efisiensi nitrogen untuk perlakuan dosis PPKS dan Precipalm diperoleh masing-masing sebesar 69.98% dan 70.09% untuk efisiensi input eksternal dan 89.53% dan 88.80% jika mempertimbangkan input internal, yang mana nilai tersebut tidak berbeda nyata., The study was carried out at PT Kalimantan Agro Nusantara, Kebun Nusantara, East Kutai, East Borneo from January 2020 to April 2020. The purpose of the study was to estimating the nitrogen balance to find out the nitrogen footprint and the application efficiency estimation of Precipalm nitrogen fertilizer application in oil palm plantations. Estimation of nitrogen balance at PT KAN Kebun Nusantara in pre-fertilization conditions was obtained -85.67 kg N ha-1 year-1, while for post-fertilization conditions obtained for the two treatments, both PPKS and Precipalm fertilization doses were 23.56 kg N ha-1 year-1 and 25.24 kg N ha-1 tahun-1. The N deficit occurs in the pre-fertilization condition if it does not consider the source input and natural decomposition process due to the absence of fertilization for the last two years, while in the post-fertilization condition there is a surplus of N for both treatments. Production nitrogen footprint obtained for pre-fertilization were 1.45 kg N ton TBS-1 and for post fertilization treatment PPKS and Precipalm were 3.19 kg N tons TBS-1 and 3.22 kg N tons TBS-1. Production nitrogen footprint data show that assessed on the nitrogen footprint parameter the unfertilized condition is more environmentally friendly than the post-fertilization condition. Estimation of nitrogen efficiency for PPKS and Precipalm dosage treatment were 69.98% and 70.09% for external input efficiency and 89.53% and 88.80%, respectively, when considering internal input, where these values were not significantly different.
Keyword: Precipalm, Neraca Nitrogen, Jejak Nitrogen, Efisiensi Pemupukan

Judul: Fertilization Management and Monitoring of Oil Palm (Elaeis guineensis Jacq.) PreciPalm Demonstration Plots at PT Kalianusa, East Kutai, East Kalimantan
Abstrak: Kegiatan magang dilaksanakan selama empat bulan dimulai Januari hingga Mei 2023 di PT Kalianusa, Kutai Timur, Kalimantan Timur. Pemupukan yang baik dan benar menjadi aspek penting yang perlu diperhatikan dalam manajemen perkebunan kelapa sawit. Pengamatan dilakukan dengan mengamati konsep 5T (tepat jenis, dosis, waktu, cara, dan tempat) terhadap kegiatan pemupukan yang dilakukan di PT Kalianusa serta monitoring terkait sex ratio, jumlah buah hitam, dan produksi pada demplot PreciPalm. Hasil pengamatan menunjukkan proses pemupukan di PT Kalianusa telah dilakukan sesuai dengan standar perusahaan yang dilihat dari konsep 5T, kecuali pada aspek tepat dosis yang masih perlu ditingkatkan lagi. Presentase mutu kegiatan pemupukan yang didapatkan berdasarkan konsep 5T sebesar 82,94%. Rasio pupuk terhadap produksi TBS diamati dengan membandingkan produksi ton ha-1 tahun-1 dengan jumlah pupuk yang direalisasikan. Rasio pupuk terhadap produksi TBS pada blok kontrol sebesar 39,46 sedangkan pada blok PreciPalm sebsar 40,77., The internship was carried out for four months from January to May, 2022 at PT Kalianusa, East Kutai, East Kalimantan. Good and correct fertilization is an important aspect that needs to be considered in the management of oil palm plantations. Observations were done by observing the 5T concept (right type, dose, time, method, and place) of fertilization activities carried out at PT Kalianusa as well as monitoring related to sex ratio, number of black fruits, and production on PreciPalm demonstration plots. The results of the observation showed that the fertilization process at PT Kalianusa had been realized out in accordance with company standards as seen from the 5T concept, except for the right dose aspect which still needed to be improved. The percentage of quality of fertilization activities obtained based on the 5T concept is 82.94%. The ratio of fertilizer to FFB production was observed by comparing the production of ton ha-1 year-1 with the amount of fertilizer realized. The ratio of fertilizer to FFB production in the control block was 39.46 while in the PreciPalm block it was 40.77.
Keyword: pemupukan, konsep 5T, kelapa sawit, PreciPalm

Judul: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology