The Relationship between Soil Conservation Techniques, Topsoil Depth and Vegetation Density in Oil Palm (Elaeis guineensis Jacq.) Plantation Areas at Nusantara IV Plantation Regional II Adolina
Abstract
This study aims to identify the soil conservation techniques applied and analyze their relationship with topsoil depth and weed vegetation density in oil palm areas at PT Perkebunan Nusantara IV Regional II Adolina. This research is important because oil palm is a strategic commodity whose productivity is influenced by soil conditions and land management. The study was conducted in April–May 2026 using a survey method with a descriptive approach. The study purposively selected samples based on differences in soil conservation techniques. Data were collected through field observations, measurements of topsoil depth, weed identification, and soil organic carbon (C) analysis. The results showed that topsoil depth ranged from 24 to 31 cm, with an average of 28.6 cm. Six weed species with a total of 4,645 individuals were identified, dominated by Lophatherum gracile (INP 66.70%) and Cenchrus purpureus (INP 65.10%). Soil organic carbon content ranged from 2.17% to 3.39%, with an average of 2.79%. This study indicates that effective soil conservation is associated with thicker topsoil, higher organic carbon content, and denser vegetation, thereby supporting sustainable land productivity.
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