The soil is very central to crop production and fertility management of rubber at the juvenile stage is critical to the productivity of rubber at maturity. the field study was conducted in 2018 and 2019 cropping season to determine the effects of rubber effluent and NPK 15:15:15 applications following cropping with rubber and snake on some post-harvest soil chemical properties in a three and four years old rubber plantation. The treatments involved a combination of sole and intercropped combination with NPK and rubber effluent application rates laid out in a randomized complete block design in three replications. Pre and Post-harvest soil analysis was carried out and data were collected on Particle size, Soil pH, Available Phosphorus, Exchangeable bases, total nitrogen and exchangeable acidity. The chemical analysis of the rubber effluent used for the study showed that it was moderately acidic with total dissolved solids, chemical oxygen demand and biochemical oxygen demand at safe levels (Table 2). It contained total N, available P, organic C, K, Mg, Na and Ca in appreciable amount. However, the composition of the effluent varies with sources. The results of the post-harvest fertility status of the soil, showed that the soil was improved, which implies that rubber effluent and NPK reduced soil acidity as the reaction changed from strongly acidic to moderately acidic. The soil analysis after the harvest of snake tomato showed that the soils benefited from the amendment with fertilizers (NPK and rubber effluent) and the soils improved with the application of NPK and rubber effluent.