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All Journal Buletin Agrohorti Jurnal Ilmu Pertanian Indonesia MANAJEMEN IKM: Jurnal Manajemen Pengembangan Industri Kecil Menengah Pastura; Journal Of Tropical Forage Science Jurnal Ilmu Lingkungan Jurnal Penelitian Hasil Hutan Jurnal Sumberdaya Alam dan Lingkungan Planta Tropika Journal of Tropical Crop Science JURNAL ILMIAH MAHASISWA AGROINFO GALUH BALANCE: Jurnal Akuntansi, Auditing dan Keuangan International Journal of Applied Business Research Jurnal Ilmiah Akuntansi Kesatuan Abdimas Galuh: Jurnal Pengabdian Kepada Masyarakat Riset: Jurnal Aplikasi Ekonomi Akuntansi dan Bisnis Jurnal Ilmiah Pariwisata Kesatuan Jurnal Abdimas Dedikasi Kesatuan Jurnal Aplikasi Bisnis Kesatuan International Journal of Electronics and Communications Systems Akuntansi dan Humaniora: Jurnal Pengabdian Masyarakat Indonesian Accounting Literacy Journal Jurnal Keuangan dan Akuntansi Terapan (KUAT) Journal of Accounting Research, Organization and Economics (JAROE) Perbal: Jurnal Pertanian Berkelanjutan Balance: Jurnal Akuntansi, Auditing, dan Keuangan
Sudradjat Sudradjat
Departemen Agronomi Dan Hortikultura, Institut Pertanian Bogor
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Journal : Journal of Tropical Crop Science

 1 
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (156.651 KB) | DOI: 10.29244/jtcs.1.2.18-24

Abstract

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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (215.122 KB) | DOI: 10.29244/jtcs.3.2.49-55

Abstract

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.
How Do Groundwater Levels and Soil Moisture Influence the Peat Fire Vulnerability Index in Oil Palm Plantations? Purnamayani, Rima; Tarigan , Suria Darma; Sudradjat, Sudradjat; Syahbuddin, Haris; Dariah, Ai; Kartiwa, Budi
Journal of Tropical Crop Science Vol. 12 No. 01 (2025): 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.12.01.235-245

Abstract

Peatland fires are a significant environmental issue, impacting local ecosystems and contributing to global climate change. This study evaluates the Peat Fire Vulnerability Index (PFVI) for sapric and hemic maturity levels under oil palm plantations in Pangkalan Pisang Village, Riau Province. Data on groundwater level, soil moisture, rainfall, and maximum temperature were collected from December 2021 to December 2022. The PFVI, modified from the Keetch-Byram Drought Index (KBDI), was calculated and correlated with these variables. The groundwater level varied from 3 cm to 76 cm below the surface, with an average of 36.23 cm. In sapric blocks, 29% of the groundwater level was less than 40 cm, while 73% were deeper. In hemic blocks, 44% were less than 40 cm, and 56% were deeper. Soil moisture in the top 10 cm layer fluctuated between 32% and 55% (v/v) Results showed significant negative correlations between PFVI and groundwater levels (r = -0.173 to -0.889) and soil moisture (r = -0.835 to -0.808), indicating that lower groundwater levels and soil moisture increase fire risk. High PFVI values in July corresponded with the lowest rainfall (59 mm) and groundwater levels below 40 cm. The study highlights the importance of monitoring hydrometeorological conditions and soil properties to effectively predict and mitigate peatland fires. Our findings are crucial for developing strategies to manage peatland sustainability and reduce fire hazards, especially in tropical regions with prevalent oil palm cultivation.
Effects of Gibberellin on Physical and Chemical Quality of Oil Palm (Elaeis guineensis Jacq.) Fresh Fruit Bunches Ramanis, Imelya; Sudradjat, Sudradjat; Saprudin, Deden
Journal of Tropical Crop Science Vol. 10 No. 02 (2023): 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.10.02.87-93

Abstract

The quality of crude palm oil (CPO) is influenced by the quality of fresh fruit bunches, crop culture, and postharvest handling. A delay in fruit processing can cause physical damages to the fresh fruit bunches. Gibberellic acid (GA3) can potentially reduce the physical damage due to delayed processing of the fresh fruit bunches. Our study aims to determine how GA3 affects the physical and chemical quality of oil palm fresh fruit bunches. The fresh fruit bunch samples were collected from the IPB-Cargill Palm Oil Education and Research, Jonggol, Bogor, Indonesia. This study used a randomized complete block design that consisted of four concentrations of GA3: 0, 12.5, 25 and 37.5 ppm. GA3 application reduced fruit loss, respiration rate, and maintain fruit moisture and firmness, increased the oil content, and stabilize the free fatty acid content. GA3 concentration of 12.5 ppm is the optimal concentration. Based on the correlation analysis, fruit softness has a strong correlation with free fatty acids.
Co-Authors Abdul Roup, Abdul Agung Marsubowo, Agung Agus Ismangil AI DARIAH Amanda, Dina Aminuyati Arief, Khozin Ariz, Nail Fadhillah Arvin, Amanda Thalia Arwan Gunawan Asep Saepulrohman Asyifa, Siti Aziz, Sepul Budi Kartiwa Callista, Christine Dahtiah, Neneng Deden Saprudin Dewi Riniarti Dhika Prita Hapsari Dwi Putri Wulandari Ervizal AMZU Fatimah Abdillah Febriyan, Febriyan Firdaus Amyar Furqoni, Hafith H. Soedarmadi Hafith Furqoni, SP., M.Si. Ph.D. Haris Syahbuddin Hariyadi, Hariyadi Herdhata Agusta Heri Sastra HUTAPEA, Riauli Susilawati Ishak, Jouzar Farouq Jan Horas Veryady Purba Jasmadeti, Jasmadeti Karnita Yuniarti, Karnita Kukuh Murtilaksono Larasati, Dinda Lawrence, Sabrina Lili Indrawati Luh Putu Ratna Sundari M A Chozin M. Ghulamahdi Maju Lumban Tobing Mochamad Umar Mai Moermahadi Soerja Djanegara Muhammad Hasjim Bintoro Djoefrie Mulia, Isnan Musa Hubeis Pienyani Rosawanti Prabowo, Aji Patra Aria Prasetia, Ega Nur Purnamayani, Rima Putra, Aprilian Putra, Yoga Adi Putri, Wulan Wahyuni Rossa Ramanis, Imelya Riptiandi, Akmal Firli Rosita Dewi Rovishany, Nabila Daffa Ruhadi Ruhadi Saijo Selvie D. Anis Setia, Budi Sudirman Yahya Sudirman Yahya Sudjali, Iwan Purwanto SURYA, Rendra Trisyanto Suryanti, Cecilia valentina Sri Hadi Sutarta, Edy Sigit Sutarta Sigit Syahrbanu Aqilah Nainawa Tarigan , Suria Darma Tri Marlina Tullah, Dewi Sarifah Wahyu Gendam Prakoso, Wahyu Gendam Yan Sukmawan, Yan Yanti Rufaedah, Yanti Yayat Hidayat Yayuk Nurjanah Yenni Asbur