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All Journal Buletin Agrohorti Jurnal Agroqua: Media Informasi Agronomi dan Budidaya Perairan Journal of Tropical Crop Science International Journal of Global Operations Research Indonesian Accounting Research Journal Policy Brief Pertanian, Kelautan, dan Biosains Tropika
Sudradjat
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Agriculture, Biological Sciences & Forestry Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Engineering Environmental Science Mathematics Social Sciences

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Jati Diri Insan Akademik : Jati Diri Insan Akademik IPB, DGB; Sarma, Ma'mun; Damar, Ario; Sudradjat; Tarigan, Suria Darma; Setiyono, Agus; Sumiati; Siregar, Ulfah Juniarti; Hariyadi, Purwiyatno; Hasim; Kolopaking, Lala M.; Fahmi, Idqan; Oktariza, Wawan; Damayanthi, Evy; Setiadi, Mohamad Agus; Nahrowi; Sri Purwaningsih, Sri
Policy Brief Pertanian, Kelautan, dan Biosains Tropika Vol 6 No 2 (2024): Policy Brief Pertanian, Kelautan dan Biosains Tropika
Publisher : Direktorat Kajian Strategis dan Reputasi Akademik IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/agro-maritim.0602.856-862

Abstract

Perguruan tinggi sebagai tempat insan akademik berkiprah saat ini mengalami berbagai tantangan dan ancaman yang dapat mengganggu fungsinya sebagai pusat pengembangan ilmu pengetahuan dan teknologi (iptek), serta menjadi penjaga keberlanjutan peradaban dan moralitas insan akademik agar tidak terdistorsi dan tererosi. Kemajuan teknologi (khususnya teknologi informasi), dekadensi moral global, tekanan ekonomi, orientasi praktis dan fokus pada pencapaian jangka pendek, perubahan paradigma pendidikan serta iklim ketidakpastian, menjadikan nilai-nilai tradisional perguruan tinggi terancam tergeser menjadi mesin penghasil tenaga kerja semata. Perguruan tinggi, yang seharusnya berperan sebagai benteng terakhir penjaga nilai-nilai akademik, serta sebagai agen perubahan (agent of change) yang berorientasi pada nilai kebaikan dan penjaga nilai moral (guardian of value), perlu jati diri insan akademik yang unggul, sehingga peran dan fungsi perguruan tinggi dapat tetap dipertahankan. Untuk memberikan pertimbangan dalam upaya menjaga tersebut, Policy Brief ini disusun melalui serangkaian proses diskusi anggota tim PAH Jati Diri Insan Akademik dan proses FGD yang melibatkan narasumber internal dan eksternal IPB. Policy Brief ini diakhiri dengan rekomendasi yang dapat diusulkan kepada penyelenggara pendidikan tinggi Indonesia agar fungsi perguruan tinggi dan insan akademik dapat tetap terjaga
Assessment of Nitrogen Volatilization and Greenhouse Gas Emissions from Urea with N-stabilizer in a Productive Oil Palm Plantation (Elaeis guineensis Jacq.) Waraqi, Bismo; Agusta, Herdhata Herdhata; Sudradjat; Hariyadi
Journal of Tropical Crop Science Vol. 11 No. 03 (2024): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jtcs.11.03.260-267

Abstract

Nitrogen fertilization plays a crucial role in supporting plant growth. However, nitrogen in the soil can be lost through rainwater leaching. To address this issue, the concept of fertilizing N-stabilizer-coated urea was proposed. The aim is to reduce nitrogen loss on the field due to vaporization and minimize greenhouse gas (GHG) emissions. The study was conducted to assess the effectiveness of this N-stabilizer-coated urea in reducing nitrogen loss through vaporization, improving GHG emissions, and its impact on plant growth and leaf quality. The research was conducted at IPB-Cargill Jonggol, Bogor, West Java, oil palm education and research station from August 2021 to March 2022. The experimental design employed a completely randomized block design. The fertilizer treatments included four types of nitrogen fertilizers: urea (46% N), coated urea with N-stabilizer (46% N), ZA (21% N), and NPK (15-15-15, 15% N). Additionally, a control treatment without any fertilizer application was included. All treatments were replicated three times. Data analysis was done using the SAS (Statistical Analysis System) 9.0 program. The F-test was conducted, followed by DMRT (Duncan Multiple Range Test) advanced tests at a 5% error level. The results revealed that urea with N-stabilizer fertilization significantly reduced NH3-vaporization by 53% in the first week compared to the application of normal urea. NH3-vaporization level from ZA and NPK was < 1% compared to urea application. Field application of urea with N-stabilizer showed no significant difference in greenhouse gas emission (GHG) compared to the other nitrogen fertilizer types. The GHG values ranged from 7.10 to 7.29 g CO2-e.m-2 per day. The use of N-stabilizer-coated urea could be an effective approach to minimize nitrogen loss through vaporization and reduce greenhouse gas emissions while maintaining comparable results to other nitrogen fertilizer types in terms of GHG emissions on the field.
Sistem Panen Kelapa Sawit di Sekunyir Estate, Kalimantan Tengah Saputra, Aris Adi; Sudradjat
Buletin Agrohorti Vol. 12 No. 3 (2024): Buletin Agrohorti
Publisher : Departemen Agronomi dan Hortikultura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/agrob.v12i3.54535

Abstract

Palm oil (Elaeis gueenensis Jacq) is an important vegetable oil in Indonesia. Palm oil productivity is influenced by various factors including harvest management. This research had specific objectives to be achieved, namely studying and understanding the management of palm oil harvesting, and analyzing the factors that influence the effectiveness and efficiency of palm oil harvesting. The research was conducted at Sekunyir estate, Central Kalimantan from February to May 2014. Data collection was obtained by direct and indirect methods. Field observations were conducted by following 8 harvesters on the Division of Labour (DOL) system and 4 harvest teams on the 1 Cutter and 2 Carrier (C1R2) system. This research concluded that changing the harvest system from the DOL system to the C1R2 system had a good impact on crop management and the productivity of the harvest team. The C1R2 system had a yield of 5-7% higher than the DOL system in obtaining ripe fruit and had a smaller number of rotten fruits which was around 2.6% compared to the DOL system which reached 8%. Keywords: harvest efficiency, C1R2 system, DOL system, harvesting technique, labor
Manajemen Pemanenan Kelapa Sawit (Elaeis guineensis Jacq.) di Labuhanbatu, Sumatera Utara Idiatsyah, Rully Amelia; Ahmad Junaedi; Sudradjat
Buletin Agrohorti Vol. 12 No. 3 (2024): Buletin Agrohorti
Publisher : Departemen Agronomi dan Hortikultura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/agrob.v12i3.59490

Abstract

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. Penelitian bertujuan mengevaluasi perencanaan panen, pelaksanaan panen, dan evaluasi panen. Penelitian dilaksanakan di Labuhanbatu, Sumatera Utara dari bulan Januari hingga Mei 2022. Data hasil pengamatan dianalisis menggunakan rata-rata, persentase, dan uji komparatif (t-student) pada taraf 5%. Hasil penelitian menunjukkan rotasi panen terpanjang mencapai 13 hari, sedangkan standar kebun adalah 10 hari. Penggunaan alat pelindung diri (APD) tergolong cukup baik walaupun terdapat beberapa pemanen yang tidak menggunakan helm dan face shield. Kapasitas panen terdapat perbedaan yang signifikan karena pekerja memperoleh basis upah harian yang ditetapkan. Rata-rata AKP sebesar 20.18% dan rata-rata varian sebesar 2.41%. Kebutuhan tenaga panen ideal dengan 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 per jam. Persentase mutu buah sesuai dengan standar kebun 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 per pokok. Penerapan sistem evaluasi, denda, dan premi panen dilakukan untuk menjaga tercapainya basis dan kualitas panen. Kata kunci: kehilangan hasil, kriteria matang panen, rotasi panen, tenaga panen
TRANSFORMASI INOVASI:PEMANFAATAN LIMBAH BATU BARA MENJADI PUPUK Wentasari, Risa; Zadzali, Helmi; Sidiq, Egi Nur Muhamad; Anam, Khairul; Sridanti, Irma Lisa; Agusta, Herdhata; Sudradjat; Hariyadi; Bintoro, Mochamad Hasjim
Jurnal Agroqua: Media Informasi Agronomi dan Budidaya Perairan Vol 22 No 2 (2024): Jurnal Agroqua
Publisher : University of Prof. Dr. Hazairin, SH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32663/ja.v22i2.4551

Abstract

Studi literatur ini bertujuan melakukan review terhadap perkembangan teknologi dalam pemanfaatan batu bara sebagai pupuk. Metode yang digunakan dalam kajian ini adalah sistematik review. pencarian artikel dilakukan menggunakan google scholar dengan kata kunci “Coal for Fertilizer” dan “Pupuk Batubara”. Pada akhir pencarian ditemukan 14 artikel terdiri dari 7 berbahasa Indonesia dan 7 berbahasa Inggris, selanjutnya dilakukan naratif review. Kesimpulan dari kajian ini adalah pemanfaatan batu bara sebagai pupuk dikembangkan dengan memanfaatkan bahan batu bara mutu rendah dan limbah batu bara: fly ash, bottom ash, asam humat dan brown coal. Teknologi pemanfaatannya segai pupuk dilakukan dengan mengaplikasikan bersama pupuk kimia dan organik secara sederhana, maupun dalam bentuk pupuk granul dan slow release.
Pengaruh Pendapatan Asli Daerah (PAD), Dana Perimbangan, Dan Sisa Lebih Perhitungan Anggaran (SiLPA) Terhadap Belanja Modal Pada Pemerintah Kabupaten Bandung Barat Tahun 2014-2021 Ulhaq, Hafizh Dhiya; Sudradjat
Indonesian Accounting Research Journal Vol. 5 No. 2 (2025): Indonesian Accounting Research Journal (Februari 2025)
Publisher : Jurusan Akuntansi Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/iarj.v5i2.5200

Abstract

The main sources that can fill regional finances and can be used as a source of financing for regional expenditures including capital expenditures are Local Own Revenue (PAD), Balancing Funds, and Utilization of Overtime Budget Calculations (SiLPA). This study aims to determine the effect of regional original income, balancing funds, and SiLPA on capital expenditure in West Bandung Regency in 2014-2021. This research is a quantitative research with a descriptive approach. The data to be used comes from the 2014-2021 APBD Realization Report. Data collection techniques in this study used literature study techniques and documentation methods. The method of analysis is descriptive analysis. The prerequisite analysis test uses the classical assumption test, namely the normality test, multicollinearity test, heteroscedasticity, and autocorrelation statistical tests. Multiple regression analysis and hypothesis testing using the coefficient of determination test, t statistical test and f statistical test. The results of the study show that Regional Original Income (PAD), Balancing Funds, and SiLPA both partially and simultaneously have an effect on capital expenditure.
Application of Queue Theory in Campus Transportation at Padjadjaran Jatinangor University Using a Multiserver Queue System Model Aufhar, Ihkam Amalul; Sudradjat; Nahar, Julita
International Journal of Global Operations Research Vol. 6 No. 3 (2025): International Journal of Global Operations Research (IJGOR), August 2025
Publisher : iora

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47194/ijgor.v6i3.386

Abstract

Trasnportation system on campus is an important aspect that supports the mobility of the Academic Community and the relations or partners of Padjadjaran University. Currently, Padjadjaran Jatinangor University provides several public transportation facilities that can be used around campus area, namely conventional motorcycle taxis, Beam electric bicycles, and campus transportation in the form of buses. Based on the results of a survey conducted by the author, campus transportation is a facility of public transportation that is more often used and in demand by the Academic Community compared to the other two facilities of public transportation. This study aims to analyze the performance of the passenger queuing system on that campus transportation using a multiserver queue system model. Data in the arrival rate of bus passenger ( ) and the rate of bus service ( ) were collected through direct observation. The results of the study showed that during the operating hours at 07:00-08:00, routes A, B, and C are optimal with number of buses as many as 5, 5, and 6 respectively. Then, during operating hours at 09:45-10:45, routes B and C are optimal with number of buses each as many as 3 buses. As for route A, it is necessary to reduce the number of buses by 1 piece. Then during operating hours at 13:00-14:00, all routes need to be reduced to 1 bus each.
Co-Authors Agus Setiyono AHMAD JUNAEDI Anam, M. Khairul Ario Damar Aufhar, Ihkam Amalul Evy Damayanthi Hariyadi Hasim Herdhata Agusta Idiatsyah, Rully Amelia Idqan Fahmi IPB, DGB Julita Nahar, Julita Lala M Kolopaking M Agus Setiadi Ma'mun Sarma Muhammad Hasjim Bintoro Djoefrie Hasjim Bintoro Djoefrie Nahrowi Oktariza, Wawan Purwiyatno Hariyadi Risa Wentasari Saputra, Aris Adi Sidiq, Egi Nur Muhamad Sri Purwaningsih, Sri Sridanti, Irma Lisa Sumiati Suria Darma Tarigan Ulfah Juniarti Siregar Ulhaq, Hafizh Dhiya Waraqi, Bismo Zadzali, Helmi