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All Journal AGROEKOTEKNOLOGI Jurnal Penelitian Kelapa Sawit
Kemala Sari
Universitas Sumatera Utara
Agriculture, Biological Sciences & Forestry

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Pengaruh Pemberian Fosfat Alam dan Bahan Organik pada Tanah Sulfat Masam Potensial Terhadap P-Tersedia Tanah dan Produksi Padi (Oryza sativa L.) M. Alfaddli Purba; Fauzi Fauzi; Kemala Sari
Jurnal Agroekoteknologi Vol 3, No 3 (2015)
Publisher : Universitas Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (260.364 KB) | DOI: 10.32734/jaet.v3i3.10937

Abstract

This research was conducted to study the effect of phosphate fertilizer and organic matter in a potential acid sulphate to P-soil available and production of rica (Oryza sativa L.) at Karang Anyar Village, Secanggang Districk. This  research was designed by factorial randomized design with 2 factor and 3 replication . Sample soils were taken with 3 replice randomly at 0-20 cm depth. The first factor is dose phosphate fertilizer are control (P0), 0.64 g (P1), 1.28 g (P2), 1.92 g (P3) and dose of organic matter are control (P0), blotong 40 g (B1), manure 40 g (P2), blotong and manure mixed (P3). The results of this study showed that of natural phosphate in acid sulphate soils can increase the P-available soil at a dose of 1.28 g / 8 kg dose equivalent 1 ton/ha , the highest weight of 1000 grains at a dose of 1.92 g / 8 kg dose equivalent 1.5 ton/ha and the lowest percentage of grain at a dose of 1.92 g / 8 kg . Giving filter cake showed the highest P-available soil. Organic matter showed the highest 1000 grain weight in a mixture of filter cake and manure at a dose of 10 tons / ha. The percentage of low grain in manure 10 tons / ha. Interaction between phosphate at a dose of 1.28 g / 8 kg dose  equivalent 1 ton/ha with a mixture of manure and filter cake, showed the highest P-available soil. Interaction between phosphate at a dose of 1.92 g / 8 kg dose equivalent 1.5 ton/ha with a mixture of filter cake and manure showed the lowest percentage of empty grains. Keywords : Phosphate fertilizer, Organic matter, Interaction, P-available and Production.
Dampak Air Terhadap Perubahan Sifat Fisik, Kimia, dan Struktur Mikro Biochar dari Tandan Kosong Kelapa Sawit Benny Hidayat; Syarifa Mayly; Dini Mufriah; Fachri Muhammad; Kemala Sari
Jurnal Penelitian Kelapa Sawit Vol 34 No 1 (2026): Jurnal Penelitian Kelapa Sawit
Publisher : Pusat Penelitian Kelapa Sawit

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22302/iopri.jur.jpks.v34i1.366

Abstract

Water is essential to life, and immersion treatment has been shown to significantly alter the properties of biochar, particularly by converting its hydrophobic nature into a hydrophilic one and others. This transformation leads to various changes in the material's physicochemical characteristics. In this study, biochar produced through pyrolysis of oil palm empty fruit bunches (EFB) using a kiln method was analyzed to assess its physical properties before and after immersion in distilled water. Surface morphology and elemental composition were evaluated using Scanning Electron Microscopy coupled with Energy Dispersive X-ray Spectroscopy (SEM-EDX), while specific surface area was measured using the Brunauer–Emmett–Teller (BET) method. Additional analyses, including pH, bulk density, water holding capacity, and moisture content, were conducted at the National Research and Innovation Agency (BRIN) and the Soil Biology Laboratory, Faculty of Agriculture, University of North Sumatra. The results demonstrated that water immersion induced notable changes in biochar characteristics. The pH of the biochar slightly decreased from 10.09 in dry EFB biochar to 9.54 in the soaked sample. While the soaked biochar exhibited higher concentrations of most nutrient elements, the carbon (C) content remained higher in the dry biochar at 65.06%. BET analysis revealed that the surface area of dry biochar (79.446 m²/g) was substantially greater than that of the soaked biochar (38.783 m²/g). Conversely, the soaked biochar showed superior performance in terms of bulk density (0.34 g/cm³), water holding capacity (10.51%).
Co-Authors Benny Hidayat Dini Mufriah Fachri Muhammad Fauzi Fauzi M. Alfaddli Purba Syarifa Mayly