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All Journal Ranah Research : Journal of Multidisciplinary Research and Development
Hari Gunawan
Institut Teknologi Sawit Indonesia, Medan, Indonesia
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Economics, Econometrics & Finance Law, Crime, Criminology & Criminal Justice Public Health Social Sciences Transportation Other

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Pengaruh Pemberian Bahan Organik Terhadap Sifat Fisik dan Sifat Kimia Tanah di Kebun Sei Putih PT. Perkebunan Nusantara IV Regional I Alfin Aziz; Hari Gunawan
Ranah Research : Journal of Multidisciplinary Research and Development Vol. 8 No. 3 (2026): Ranah Research : Journal Of Multidisciplinary Research and Development
Publisher : Dinasti Research

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38035/rrj.v8i3.2081

Abstract

This study aims to determine the effect of organic matter application on the physical and chemical properties of soil in oil palm plantations at Sei Putih Plantation of PT. Perkebunan Nusantara IV Regional I. The study was conducted from October to December 2025 using a composite sampling method at three treatment points, namely dead fences, oil palm empty bunch application areas (tankos), and plant discs, with a total of 15 samples. The parameters observed included soil physical properties (bulk density, porosity, and texture) and soil chemical properties (pH, organic C, total N, available P, and soil K). The results showed that the bulk density value ranged from 1.32–1.37 gr/cm³, with the lowest value in the organic matter application area. Soil porosity ranged from 48.17%–50.19%, showing an inverse relationship with bulk density. Soil texture was dominated by sandy loam and sandy clay loam. The chemical properties of the soil show a pH ranging from 5.26 to 5.60 (slightly acidic), organic C content of 1.23% to 2.01%, total N content of 0.58% to 0.85%, available P content of 10.65 to 12.13, and soil K content of 0.36 to 0.70. In general, the application of organic matter in the form of empty oil palm bunches has an effect on improving the physical and chemical properties of the soil, although statistical analysis does not show significant differences between treatments. However, the application of organic matter still has the potential to improve soil quality sustainably in oil palm plantations.
Analisis Populasi Mikroorganisme Tanah di Lahan Perkebunan Kelapa Sawit Kebun Adolina PT Perkebunan Nusantara IV Regional II Rolas Simanullang; Hari Gunawan
Ranah Research : Journal of Multidisciplinary Research and Development Vol. 8 No. 3 (2026): Ranah Research : Journal Of Multidisciplinary Research and Development
Publisher : Dinasti Research

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38035/rrj.v8i3.2108

Abstract

The population of soil microorganisms is an important indicator in maintaining the biological quality of soil in oil palm plantation ecosystems. Differences in land management zones such as plates, inter-row spaces, and dead grates are thought to affect soil environmental conditions and the dynamics of microorganism populations. This study aims to analyze the population of soil microorganisms in the form of bacteria and fungi in various oil palm land management zones at the Adolina Regional II Plantation of PT. Perkebunan Nusantara IV, Serdang Bedagai Regency, North Sumatra. The study was conducted from June 2025 to February 2026 using a non-factorial Completely Randomized Design (CRD) with three treatments, namely F1K (in plates), F2K (inter-row spaces), and F3K (dead grates), each replicated five times. Soil samples were taken as a composite at a depth of 20 cm and analyzed at the Soil Chemistry and Biology Laboratory of the University of North Sumatra. The parameters observed included the population of soil bacteria and fungi in CFU/g units, as well as supporting parameters in the form of soil pH and organic C content. The results showed that the highest bacterial population was found in the F2K treatment at 4.05 × 10⁷ CFU/g, while the highest fungal population was found in the F3K treatment at 4.75 × 10⁶ CFU/g. The highest C-organic content was found in the dead trellis at 0.90%, indicating a positive relationship between the accumulation of organic matter and increased activity of soil microorganisms. The results of the analysis of variance (ANOVA) showed that the treatment had no significant effect on the bacterial population (p = 0.372) or fungi (p = 0.591). However, descriptively there was a tendency for an increase in the population of microorganisms in the inter-row
Co-Authors Alfin Aziz Rolas Simanullang