<![CDATA[Peanuts (Arachis hypogaea L.) are legumes that can improve soil fertility through nitrogen fixation by Rhizobium bacteria. Research on changes in soil nutrient content—specifically nitrogen (N), phosphorus (P), and potassium (K), before and after peanut planting, as well as root responses in coconut palm oil land, is important for establishing effective land management strategies. This study aims to determine the changes in nutrient content (N, P, and K) of land before and after planting peanuts as an intercrop in TBM land (land not yet producing) for coconut oil palm. The research was conducted at People's Garden Hill Bahorok Gate, Langkat Regency, from May 2025 to February 2026, using descriptive statistics. The researchers planted five beds with a total of 1,000 Gajah peanut seeds. The entire cultivation process was performed manually without the use of fertilizers, pesticides, fungicides, insecticides, or mulch, to assess the plant's natural ability to enhance soil nutrients. The results showed a peanut yield of 8.8 kg over three months, with 748 live plants. Soil analysis before planting indicated N content of 0.07%, P of 19.78 ppm, and K of 0.06 me/100 g. After planting, nutrient levels increased to N 0.08%, P 48.47 ppm, and K 0.19 me/100 g. The increase in nitrogen was influenced by the activity of Rhizobium bacteria. In contrast, the increases in phosphorus and potassium likely originated from the decomposition of organic matter and plant residues. This study shows that peanuts can increase soil fertility in oil palm TBM land while providing economic benefits for farmers.]]>
