Akhiruddin Tanjung; Saroha Manurung; Aulia Juanda Djaingsastro. The Relationship Between Soil Conservation Techniques, Topsoil Depth, and Density of Vegetation Growing and Soil Organic C Content in Palm Oil (Elaeis Guineensis Jacq) Plant Areas at Plantation IV Regional II Pabatu North Sumatra Province, Indonesia. JUATIKA 2026, 8, 745 -.