Utilizing yield, profitability, and environmental sustainability in terms of soil quality as the goal variables, we created a methodological protocol for a thorough assessment of nutrient management (NM) technologies for feasibility and optimized fenugreek production employing organic sources of nutrients in the acid soil of Northeast India. Five organic nutrient management technologies were tried and tested comprising T₁: absolute control; T₂: 2.5 t ha⁻¹ vermicompost (VC) + 250 kg ha⁻¹ lime; T₃: 5 t ha⁻¹ farmyard manure (FYM) + 250 kg ha⁻¹ lime; T₄: 10 t ha⁻¹ FYM + 250 kg ha⁻¹ lime; and T₅: 5 t ha⁻¹ VC + 250 kg ha⁻¹ lime with four replications laid out in a randomized block design for two consecutive growing seasons during 2018–2020. Results indicated that across the differential levels of organic amendments (treatments) employed, the addition of maximum doses of VC and FYM, in general, excelled over the other treatments concerning fenugreek seed yield, its yield attributes, soil properties, and better economic returns. Thus, the overall findings elucidated that the addition of higher doses of organic amendments (VC and FYM) can sustainably improve fenugreek productivity, soil properties, and economic returns for fenugreek growers in the acid soil of Northeast India.