SoilREns merupakan jurnal ilmiah ilmu tanah pertanian dan lingkungan. Berisi kumpulan hasil penelitian terkini mengenai isu-isu ilmu tanah pertanian dan lingkungan. Diterbitkan atas kerjasama antara Departemen Ilmu Tanah dan Sumberdaya Lahan Fakultas Pertanian UNPAD, bekerjasama dengan Himpunan Ilmu Tanah Indonesia (HITI).
Dept Ilmu Tanah & Sumberdaya Lahan Fakultas Pertanian Universitas Padjadjaran
Kajian Sifat Fisika Tanah Pada Perkebunan Kelapa Sawit (Elaeis guineensis Jacq) di Kecamatan Tambang, Kampar
This study aims to identify and analyze the physical properties of soils in oil palm plantation areas in Tambang District, Kampar Regency. Soil sampling was conducted purposively at depths of 0–30 cm and 30–60 cm, and the samples were analyzed in the laboratory for parameters including permeability, moisture content, bulk density (BD), particle density (PD), total pore space (TPS), organic carbon (C-organic), and organic matter. The results showed soil permeability at the 0–30 cm depth was classified as slow (0.47 cm·hour⁻¹), while at the 30–60 cm depth it was moderately slow (1.026 cm·hour⁻¹). Moisture content decreased from 17.63% in the upper layer to 10.14% in the lower layer. BD and PD values were very low, at 0.2171 g·cm⁻³ and 0.6391 g·cm⁻³ in the upper layer, and 0.1382 g·cm⁻³ and 0.5428 g·cm⁻³ in the lower layer. Total pore space was extremely high, at 66.04% and 74.54%, respectively. Organic carbon and organic matter contents were classified as very high at both depths, with values ranging from 56.77% to 57.1% and 97.8% to 98.44%, respectively. The high organic matter content results in low bulk density, high porosity, and substantial water holding capacity; however, the dominance of macropores in the lower layer leads to relatively lower moisture content. These conditions reflect the characteristics of peat soils, which are highly porous but require proper water and nutrient management to optimize oil palm productivity.
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Karakteristik Kimia Biochar Limbah Bonggol Jagung pada Berbagai DurasiPirolisis: pH, Kapasitas Tukar Kation, dan C-Organik
Biochar is a soil amendment material that can be produced through the pyrolysis of biomass,including corn cobs. This study aimed to determine the effect of pyrolysis duration on the chemical properties of corn cob biochar based on pH, cation exchange capacity (CEC), and organic carbon (Corganic) content. The study was conducted from May to July 2026 using a pyrolysis reactor at a temperature of 400 °C with four pyrolysis durations: 3 h (P1), 4 h (P2), 5 h (P3), and 6 h (P4), with three replications for each treatment. The observed parameters were pH, CEC, and organic carbon content. The data were analyzed using analysis of variance followed by Duncan's Multiple Range Test at the 5% significance level when significant differences were detected. The results showed that increasing the pyrolysis duration increased the pH and organic carbon content of the biochar. The pH values were 8.12, 8.31, 8.53, and 8.66 for P1 to P4, respectively, while the organic carbon content increased from 62.40% to 71.80%. CEC increased from 32.53 cmol kg⁻¹ in P1 to 42.40 cmol kg⁻¹ in P3, followed by a decrease to 40.40 cmol kg⁻¹ in P4. Treatment P4 produced the highest pH and organic carbon content, whereas P3 resulted in the highest CEC. Thus, pyrolysis durations of 5–6 hour produced favorable chemical characteristics of corn cob biochar based on the evaluated parameters.
Variasi Sifat Fisika Tanah pada Berbagai Posisi Lereng di Lahan Agak Curam: Studi Kasus di Kiarapayung, Jatinangor
Topography, particularly slope position, plays an important role in determining soil physical variability, which affects land productivity. This research aims to analyse the effect of slope position on soil physical properties, such as soil texture, bulk density, soil porosity, and soil permeability. Study was conducted in Cilayung village, Jatinangor, Sumedang Regency at ± 850 m asl. We used survey, descriptive, and comparative methods. Stratified sampling was conducted based on three slope positions: upper slope, middle slope, and lower slope. Five samples were collected from each slope position at each sampling site, resulting in a total of 30 samples. Statistical analyses were performed using analysis of variance (ANOVA), followed by Duncan’s multiple range test (DMRT) at a 5% significance level. The results showed that slope position significantly affected the proportions of sand, silt, and clay, as well as soil bulk density and soil permeability. The upper slope had the highest clay content and porosity but exhibited the lowest bulk density and permeability. In contrast, the middle slope had the highest sand content and bulk density, while the highest soil permeability was observed at the lower slope. These findings indicate that slope position is an important factor to consider in conservation-based land management.
Respon Pertumbuhan Pakcoy (Brassica rapa L. var. chinensis) Terhadap Variasi Komposisi Media Tanam
The growth of bok choy (Brassica rapa L. var. chinensis) is affected by the type and composition of growing media. This study evaluated the growth response of pakcoy to five media combinations: P1: Soil + Rice Husk Charcoal (2:1), P2: Soil + Rice Husk Charcoal + Cow Manure Compost (2:1:1), P3: Soil + Rice Husk Charcoal + Cocopeat (2:1:1), P4: Soil + Rice Husk Charcoal + Vermicompost (2:1:1), and P5: Soil + Cow Manure Compost + Vermiculite + Malang Sand (2:1:1:1). Growth was assessed based on plant height, leaf number, root length, shoot fresh weight, and root fresh weight. The data were subjected to analysis of variance (ANOVA), followed by Duncan’s Multiple Range Test (DMRT) at a 5% significance level (α = 0.05). The results indicated that media composition significantly affected all growth parameters. Among the treatments, P4 produced the most favorable growth response, recording a plant height of 22.33 cm, 12 leaves, a root length of 50.83 cm, a shoot fresh weight of 31.00 g, and a root fresh weight of 25.42 g. Higher growth observed under P4 was likely associated with the role of rice husk charcoal through improved aeration and porosity, while vermicompost supplied essential nutrients and enhanced beneficial microbial activity, thereby creating more favorable growing conditions for bok choy compared with the other treatments.