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All Journal Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Jurnal Ilmu Pertanian Indonesia Pastura; Journal Of Tropical Forage Science Jurnal Penelitian Hasil Hutan Journal of Tropical Crop Science Jurnal Abdimas Dedikasi Kesatuan

Sudradjat Sudradjat

Departemen Agronomi Dan Hortikultura, Institut Pertanian Bogor

Author-ID : 388344

Religion Agriculture, Biological Sciences & Forestry Humanities Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Environmental Science Public Health Social Sciences Other

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PENGARUH PENGGUNAAN KATALIS ZEOLIT DALAM ESTERIFIKASI TERHADAP RENDEMEN DAN KUALITAS BIODIESEL MINYAK JARAK PAGAR (Jatropha curcas L.) Sudradjat, Sudradjat; Marsubowo, Agung; Yuniarti, Karnita
Jurnal Penelitian Hasil Hutan Vol 27, No 3 (2009): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Esterifikasi merupakan salah satu tahapan dalam pembuatan biodiesel yang bertujuan untuk menurunkan nilai bilangan asam lemak bebas pada minyak nabati yang digunakan sebagai bahan baku pembuatan biodiesel. Pada umumnya proses esterifikasi dilakukan dengan menggunakan katalis asam cair seperti HCl dan H2SO4. Katalis padat, seperti zeolit, berpotensi untuk dikembangkan lebih lanjut dalam proses esterifikasi minyak jarak pagar. Penelitian bertujuan untuk mengetahui pengaruh penggunaan zeolit sebagai katalis pada proses esterifikasi minyak jarak pagar terhadap rendemen dan kualitas biodiesel yang dihasilkan. Hasil yang diperoleh menunjukkan bahwa zeolit teraktivasi dengan kadar 3% (b/b) dari minyak yang diesterifikasi memiliki potensi yang besar untuk dikembangkan lebih lanjut sebagai katalis pada proses esterifikasi minyak jarak pagar karena menurunkan kadar asam lemak bebas dalam minyak secara signifikan. Penggunaan ulang zeolit untuk proses esterifikasi minyak jarak pagar pada prinsipnya dapat dilakukan setelah zeolit dicuci dengan air atau alkohol, akan tetapi berpotensi menurunkan kualitas biodiesel yang dihasilkan.

Influence of Manure, Nitrogen, Phosphorus and Potassium Fertilizer Application on Growth of One-year-old Oil Palms on Marginal Soil in Jonggol, Bogor, Indonesia Sudrajat, Sudradjat; Sukmawan, Yan; Sugiyanta, Sugiyanta
Journal of Tropical Crop Science Vol 1 No 2 (2014): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

The oil palms (Elaeis guineensis Jacq.) are highlyefcient oil producers. It produces ve to seven timesmore vegetable oil per hectare than soybean, sunower,and rapeseed. The objectives of this research were tostudy the role of organic and N, P, and K fertilizers ongrowth of one-year-old immature oil palm on marginalsoil in Jonggol. The research was conducted at IPBCargill Teaching Farm (ICTF) of Oil Palm, Jonggol,Bogor,West Java from March 2013 to March 2014. Theexperiment was arranged in a factorial experimentfollowing a randomized block design with threereplications. The rst factor was organic fertilizer(manure) consisting of 0 (O), 15 (O1) and 30 (O2) kg pertree per year. The second factor was inorganic fertilizerconsisting of 0 (S0); 0.25 kg N + 0.25 kg P O + 0.39 kg 2 5K O(S ) 0.50 k N+ 0.50 kg P O + 0.78 kg K O(S ) 2 25 2 1and g 2per tree. The results demonstrated that application ofmanure up to 30 kg per tree per year did not affect thegrowth of one-year-old oil palm. Application of 0.50 kg N+ 0.50 kg P O + 0.78 kg K O highest 2 5 2 per tree gave theresult in increasing frond production, stem girth, and leafnutrient concentration. The results of leaf analysis andplant growth responses suggested that the rates ofmanure and inorganic fertilizers applied in this study arenot sufcient to improve young oil palm growth inmarginal soil in Jonggol.Keywords: cow manure, critical nutrient level, inorganicfertilizer, soil fertility, vegetative growth

The Roles of Asystasia gangetica (L.) T. Anderson and Ridge Terrace in Reducing Soil Erosion and Nutrient Losses in Oil Palm Plantation in South Lampung, Indonesia Asbur, Yenni; Yahya, Sudirman; Murtilaksono, Kukuh; Sudradjat, Sudradjat; Sutarta, Edy Sigit Sutarta Sigit
Journal of Tropical Crop Science Vol 3 No 2 (2016): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Asystasia gangetica (L.) T. Anderson is a weed commonly found on oil palm plantations and can be used as cover crop for mature oil palm plantations due to its tolerance to shading. The use of cover crop is a soil conservation technique to support sustainable availability of soil nutrients by reducing erosion and nutrients loss, particularly during the rainy seasons. This research aims to determine the roles of A. gangetica as cover crop for measures against erosion and nutrients loss in mature oil palm plantation. This research was conducted in oil palm plantation, Unit Rejosari, PT Perkebunan Nusantara (PTPN) VII, District of Natar, South Lampung Regency from August 2014 to April 2015. The research used split block design in randomized complete block design with two factors and six replications. The main plots were ridge terrace, namely with and without ridge terrace. The sub plots were cover crops, namely with and without cover crops A. gangetica. The results show that using A. gangetica as cover crops in mature oil palm plantations effectively minimized erosion and loss of organic C, N, P, and K by 95.7%, 93.4%, 96.0%, and 90.0 %, respectively. The use of cover crop became more effective when combined with ridge terrace and reduced erosion by 94.1% and loss of organic C, N, P and K by 99.1%, 99.2%, 90.0% and 98.5%, respectively.

PKM Uji Kompetensi Bidang Keahlian Akuntansi Di SMK Bina Sejahtera Kota Bogor Sudradjat, Sudradjat; Djanegara, Moermahadi Soerja
Jurnal Abdimas Dedikasi Kesatuan Vol 1 No 1 (2020): JADKES Edisi Juli 2020
Publisher : LPPM Institut Bisnis dan Informatika Kesatuan

Uji Kompetensi Keahlian (UKK) merupakan proses penilaian melalui pengumpulan bukti yang relevan apakah seseorang kompeten atau belum kompeten pada suatu klasifikasi tertentu. UKK diikuti oleh siswa dan siswi Sekolah Menengah Kejuruan (SMK). UKK disusun berdasarkan skema sertifikasi sesuai dengan jenjang kualifikasi peserta UKK yang memuat kemampuan untuk melaksanakan pekerjaan spesifik, operasional dan penjaminan mutu. Peraturan Menteri Pendidikan dan Kebudayaan Nomor 34 tahun 2018 tentang Standar Nasional Pendidikan SMK/MAK, tujuan penilaian hasil belajar adalah: (1) mengetahui tingkat capaian hasil belajar siswa; (2) mengetahui pertumbuhan dan perkembangan peserta didik; (3) mendiagnosis kesulitan belajar peserta didik; (4) mengetahui efektivitas proses pembelajaran; dan (5) mengetahui pencapaian kurikulum. Sedangkan tujuan pelaksanaan Ujian Kompetisi Keahlian (UKK) adalah: (a) mengukur pencapaian kompetensi siswa SMK yang telah menyelesaikan proses pembelajaran sesuai kompetensi keahlian yang ditempuh; (b) memfasilitasi siswa SMK yang akan menyelesaikan pendidikannya untuk mendapatkan sertifikat kompetensi dan/atau sertifikat uji kompetensi; (c) mengoptimalkan pelaksanaan sertifikasi kompetensi yang berorientasi pada capaian kompetensi lulusan SMK sesuai Kerangka Nasional Indonesia; (d) memfasiliasi kerjasama SMK dengan dunia usaha/industri dalam rangka pelaksanaan uji kompetensi sesuai kebutuhan dunia usaha dan dunia industri. Kompetensi keahlian akuntansi adalah salah satu bagian dari bidang keahlian bisnis manajemen di SMK Bina Sejahtera yang mendapat minat dari masyarakat selain bidang keahlian bisnis manajemen yang lain seperti pemasaran dan administrasi perkantoran. Kata Kunci : Kompetensi, SMK, Siswa

PKM Uji Kompetensi Bidang Keahlian Akuntansi di SMK Pembangunan Kota Bogor Sudradjat, Sudradjat; Amyar, Firdaus
Jurnal Abdimas Dedikasi Kesatuan Vol 1 No 1 (2020): JADKES Edisi Juli 2020
Publisher : LPPM Institut Bisnis dan Informatika Kesatuan

Uji Kompetensi Keahlian (UKK) bertujuan untuk mengukur pencapaian kompetensi siswa pada level tertentu sesuai kompetensi keahlian yang ditempuh selama masa pembelajaran di SMK. UKK dilaksanakan oleh satuan pendidikan dalam bentuk ujian praktik yang menguji aspek pengetahuan, keterampilan, dan sikap. UKK dilaksanakan menggunakan standar yang ditetapkan oleh industri, Lembaga Sertifikasi Profesi, dan/atau perangkat uji yang dikeluarkan oleh Kementerian Pendidikan dan Kebudayaan. Satuan pendidikan yang menyelenggarakan UKK harus dinyatakan layak sebagai tempat uji kompetensi oleh koordinator Ujian Nasional Tingkat Provinsi atau Lembaga Sertifikasi Profesi. Sebagaimana tahun sebelumnya, nilai UKK akan diperhitungkan sebagai Nilai Ujian Sekolah untuk mata pelajaran kompetensi kejuruan. Perangkat UKK yang dikeluarkan oleh Kementerian Pendidikan dan Kebudayaan bersifat terbuka dan peserta uji dapat berlatih menggunakan perangkat ujian tersebut sebelum pelaksanaan ujian. Secara umum perangkat Uji Kompetensi Keahlian terdiri atas : (1) Soal Praktik Kejuruan (SPK) adalah berupa penugasanbagi peserta uji untuk membuat atau proses dan mengerjakan suatu produk/jasa; (2) Pedoman Penilaian Soal Praktik (PPSP) adalah instrumen yang digunakan untuk pemberian skor setiap komponen penilaian. Lembar penilaian memuat komponen penilaian, sub-komponen penilaian, pencapaian kompetensi, dan kriteria/rubrik penilaian; dan (3) Instrumen Verifikasi Penyelenggara Ujian Praktik Kejuruan (InV) adalah instrumen yang digunakan untuk menilai kelayakan satuan pendidikan atau institusi lain sebagai tempat penyelenggaraan ujian Praktik Kejuruan. Instrumen verifikasi memuat standar persyaratan peralatan utama, standar persyaratan peralatan pendukung,standar persyaratan tempat/ruang serta memuat persyaratan penguji yang terdiri atas penguji internal dan eksternal. Kata Kunci : Kompetensi, Pembelajaran, Siswa

Optimasi Dosis Pupuk Majemuk NPK dan Kalsium pada Bibit Kelapa Sawit (Elaeis guineensis Jacq.) di Pembibitan Utama Rizki Fauziah Ramadhaini; Sudradjat .; Ade Wachjar
Indonesian Journal of Agronomy Vol. 42 No. 1 (2014): Jurnal Agronomi Indonesia
Publisher : Indonesia Society of Agronomy (PERAGI) and Department of Agronomy and Horticulture, Faculty of Agriculture, IPB University, Bogor, Indonesia

ABSTRACTThis research was aimed to evaluate the rates of NPK and calcium fertilizers for the growth of oil palm seedling at main nursery. It was conducted in IPB Experimental Station, Cikabayan, Darmaga, Bogor from December 2011 to November 2012. The two factors, NPK and calcium, were arranged in a randomized block design with three replications. The rates of NPK fertilizer (15-15-15) were 0, 115, 230 and 460 g seedling-1. The rates of calcium fertilizer were 0, 5, 10 and 20 g seedling-1. There was no interaction effect observed between NPK and calcium fertilizer. NPK fertilizer, however had the significant quadratic effect on plant height, leaf number, stem diameter and chlorophyll content. Based on morphology variables, recommended optimum rate of NPK 15-15-15 fertilizer was 333 g seedling-1 for eight months. Thus, NPK rates were 7.00, 7.00, 19.45, 59.25, 66.3, 61.55, 58.97 and 54.16 g seedling-1 from first to eight month respectively. The optimum rate of calcium fertilizer was not determined in this experiment.Keywords: NPK 15-15-15, nutrient, optimum rates, recommendation

Optimasi Dosis Pupuk Organik dan NPK Majemuk pada Tanaman Kelapa Sawit Belum Menghasilkan Irwan Siallagan; Sudradjat ,; Hariyadi ,
Indonesian Journal of Agronomy Vol. 42 No. 2 (2014): Jurnal agronomi indonesia
Publisher : Indonesia Society of Agronomy (PERAGI) and Department of Agronomy and Horticulture, Faculty of Agriculture, IPB University, Bogor, Indonesia

ABSTRACTOptimum fertilization is not only proposed for obtaining desireable quality and quantity of the plant, but also to avoid excess fertilizer causing toxicity and environmental damage. The objective of this research was to study and to determine an optimum rate of organic and NPK compound fertilizers for immature oil palm. The experiment was carried out at IPB-Cargill Oil palm Teaching Farm, Jonggol, from March 2013 to March 2014. The treatments was laid out in a factorial randomized complete block design with three replications. The first factor was organic fertilizer, i.e. 0, 15, 30 and 45 kg organic fertilizer plant-1, and the second was NPK compound fertilizer, i.e. 0, 0.65, 1.3, 1.95 and 2.6 kg NPK compound fertilizer plant-1. The result showed that vegetative growth increases with fertilizer application. The height and stem girth of plant were significantly affected by interaction between organic and NPK compound fertilizers, however there was no significant effect on frond production, frond length and leaf area. N, P leaf content of plant were affected by interaction between organic and NPK compound fertilizers, however there was no effect on K leaf content, chlorophyll and number of stomata. Based on the height and stem girth regression equation, the optimum recommendation rate of organic and NPK compound fertilizers for immature first year oil palm are 40.7 kg organic fertilizer plant-1 and 1.9 kg NPK compound plant-1 Keywords: inorganic fertilizers, nutrient level, stem girth, vegetative growth

Optimasi Dosis Pupuk Nitrogen dan Fosfor pada Bibit Kelapa Sawit (Elaeis guineensis Jacq. ) di Pembibitan Utama Sudradjat ,; Anita Darwis; Ade Wachjar
Indonesian Journal of Agronomy Vol. 42 No. 3 (2014): Jurnal Agronomi Indonesia
Publisher : Indonesia Society of Agronomy (PERAGI) and Department of Agronomy and Horticulture, Faculty of Agriculture, IPB University, Bogor, Indonesia

ABSTRACTThe total area of oil palm plantation has grown rapidly in Indonesia since the last three decades. Oil palm extensification and replanting need high quality seedlings. Accurate rate of nitrogen and phosphor fertilizer are key factors to obtain high quality seedlings. The objective of this experiment was to determine the optimum rate of nitrogen and phosphorus fertilizers for oil palm seedling (Elaeis guineensis Jacq.) in main nursery and to obtain seedlings ready for field planting. This experiment was carried out at IPB Experimental Station, Cikabayan Dramaga, Bogor, from November 2011 to May 2012. The experiment was arranged in a factorial randomized block design with three replications. The first factor was N i.e. 0, 8.51, 17.02, and 34.04 g N plant-1 and the second was P i.e. 0, 2.28, 4.56, and 9.12 g P plant-1. The result of the experiment showed that vegetative growth increased with fertilizer application. The height of plant were affected by interaction between N and P significantly. The total leave number and stem diameter increased quadratically with fertilizer rate of N and were linearly increased with application of P. Application of N fertilizer influenced the chlorophyl content only at 5 months after planting, and did not significantly affect the stomatal density. The result of leaf analysis showed that nitrogen and phosphor content respectively were 3.43% and 0.28%, where both of them were above the critical level. The optimum rate of N for oil palm seedling during six months at the main nursery was 20.06 g plant-1, whereas P was 4.24 g plant-1.Keywords: fertilizer recommendation, physiological respons, vegetative growth

Optimasi Dosis Pupuk Kalsium dan Magnesium pada Bibit Kelapa Sawit (Elaeis guineensis Jacq.) di Pembibitan Utama Eltis Panca Ningsih; Sudradjat ,; Supijatno ,
Indonesian Journal of Agronomy Vol. 43 No. 1 (2015): Jurnal Agronomi Indonesia
Publisher : Indonesia Society of Agronomy (PERAGI) and Department of Agronomy and Horticulture, Faculty of Agriculture, IPB University, Bogor, Indonesia

Oil palm is one of the important plantation crops in the plantation sector. Increased oil palm plantation area causes the need for the availability of oil palm seedlings in large quantities. Good quality oil palm seedlings were obtained through intensive maintenance especially fertilization. Fertilizers needed for the growth of oil palm seedlings include calcium and magnesium fertilizers. The objective of this experiment was to determine the optimum rates of calcium and magnesium fertilizer for oil palm seedling (Elaeis guineensis Jacq.). This experiment was conducted at Cikabayan Experimental Station, IPB Darmaga, Bogor, from December 2011 to November 2012. The experimental design used was factorial randomized block design with three replications. The first factor was Ca fertilizer rates i.e., 0, 5, 10, and 20 g CaCO3 plant-1. The second factor was Mg fertilizer rates, i.e., 0, 24, 48, and 96 g MgSO4 plant-1. The results showed that calcium affected stomatal density, whereas magnesium fertilizer affected morphological and physiological variables (stomatal density and chlorophyll content) of oil palm seedling. Based on the plant height and stem diameter, the recommended rate of magnesium fertilizer for 8 months oil palm seedlings in the main nursery was 58 g plant-1. This total rate should be applied at different amount every month from 1-8 month, at 2.0, 2.0, 8.0, 9.3, 8.8, 9.3, 9.4 and 9.3 g MgSO4 plants-1, respectively. The optimum rate of calcium fertilizer was not able to be determined in this research. Keywords: chlorophyll, leaf, morphology, physiology

Peran Pupuk Organik dalam Meningkatkan Efektivitas Pupuk NPK pada Bibit Kelapa Sawit di Pembibitan Utama Vira Irma Sari; Sudradjat ,; Sugiyanta ,
Indonesian Journal of Agronomy Vol. 43 No. 2 (2015): Jurnal Agronomi Indonesia
Publisher : Indonesia Society of Agronomy (PERAGI) and Department of Agronomy and Horticulture, Faculty of Agriculture, IPB University, Bogor, Indonesia

Main nursery is the first step affecting oil palm’s age and productivity. Good plant growth will produce high quality and yield of oil palm. The demand of oil palm seedlings for extensification and replantation increases continuously, and therefore this need to be supported by precise fertilization programs. The objectives of this experiment were to investigate the role of organic fertilizer and to obtain the best organic-NPK fertilizer combination in increasing the effectiveness of the use of NPK fertilizer for the growth of oil palm (Elaeis guineensis Jacq.) seedling in the main nursery. The experiment was conducted from December 2011 to September 2012 at IPB Teaching Farm Dramaga Bogor. The treatment was arranged in a factorial randomized block design with three replications. The first factor was amount of organic fertilizer consisted of 0:6, 1:6, 2:6, and 3:6 of the soil volume (6 kg). The second factor was NPK fertilizer rates, i.e., 0.0, 127.5, 255, and 382.5 g NPK per plant. The results showed that application of organic fertilizer increased the effectiveness of NPK fertilizer and could be a substitute for NPK fertilizer in oil palm seedlings. The best combination treatment was 2:6 (organic fertilizer:top soil) and 382.5 NPK g per plant with effectiveness of 158.9, 209.1 and 170.1 % for plant height, leaf number and stem diameter, respectively. The efficiency of N, P, and K application were 56.2, 11.1, and 29.0% for the same variables, respectively. Based on morphological variables, recommended rate of an NPK compound fertilizer 15-15-15 was in the range of 396.05 g per seedling for eight months. Recommended NPK were 7.00, 12.59, 37.58, 56.41, 36.74, 87.00, 86.60, and 72.97 g per seedling for first to eighth months, respectively.Keywords: chlorophyll, fertilizer recomendation, morphological and physiological response, nutrient balance

Co-Authors Ade Wachjar Ade Wachjar Afifah Farida Jufri Agung Marsubowo, Agung Anita Darwis Eko Sulistyono Eltis Panca Ningsih, Eltis Panca Feni Shintarika Firdaus Amyar H. Soedarmadi Hariyadi , Hidayat Saputra Irwan Siallagan Karnita Yuniarti, Karnita Kukuh Murtilaksono Luh Putu Ratna Sundari M A Chozin M. Ghulamahdi Moermahadi Soerja Djanegara Muhammad Hasyim Bintoro MUNIF GHULAMAHDI Natalia Puteri Widiastuti Ratih Kemala Dewi Rizki Fauziah Ramadhaini Saijo Saijo Selvie D. Anis Selvie Diana Anis Soedarmadi Hardjosoewignyo Sofyan Zaman SUDIRMAN YAHYA Sudirman Yahya sudirman Yahya Sugiyanta Supijatno, . Sutarta, Edy Sigit Sutarta Sigit Vira Irma Sari Yan Sukmawan Yan Sukmawan, Yan Yenni Asbur

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