Beyond Oil Palm Monoculture: Phase-Specific Multi cropping, Livestock Integration and Inclusive Value Chains for Sustainable Plantation

Oil palm landscapes are central to rural livelihoods in Indonesia, yet production systems face interacting concerns about ecological simplification, ageing palms, yield gaps, income volatility and uneven market participation. Diversifying land use within established plantations has been proposed as a pathway towards environmental, social and economic sustainability, but its feasibility varies substantially between immature and mature plantation phases. This qualitative literature review synthesises peer-reviewed research published during 2020–2026, examining intercropping, managed understorey vegetation, crop–livestock integration, smallholder livelihoods, ecological restoration and value-chain governance. Using an interpretive thematic approach rather than a systematic review or meta-analysis, the article distinguishes direct oil-palm evidence from transferable findings in other agricultural systems. Six linked themes emerge: phase-dependent biophysical suitability; conditional ecological multifunctionality; livestock feed and biosecurity constraints; profitability and household risk; seed, labour and offtake bottlenecks; and institutional capacity. The proposed phase-specific decision architecture prioritises food and horticultural crops during the immature stage, and carefully managed understory forage or livestock options during the mature stage, subject to site assessments. Diversification alone is neither a guaranteed yield gain nor an adequate substitute for forest protection, sound palm agronomy or equitable contracts. A market-first, pilot-before-scale programme with measurable ecological safeguards, enterprise budgets and negotiated benefit sharing provides a more defensible implementation pathway. The review identifies comparative trials and longer-term socioeconomic monitoring as priorities for validating landscape-level sustainability gains.