This research study assessed the use of Pueraria phaseoloides crops as cover in oil palm (Elaeis guineensis) plantations to improve the ecological function of soils under tropical conditions. The plots examined (90 palms•ha -1 ) were established 5, 7, 11, and 30 years ago. The results showed a high and stable specific coverage index that ranged between 52 and 87%. This enhanced soil moisture by reducing the incidence of solar radiation. It also increased competitive capacity with the complex of weeds present and improved soil nutrient averages (1.60 mg/L N and 0.42 mg/L P). Fruit bunch average yields also improved in the short term, ranging from 10.6 to 22.4 t•ha -1 , with more frequent harvest events when compared to the control. It is concluded that Pueraria phaseoloides is a sustainable alternative to improve the establishment of plantations under tropical conditions.