The impact of rubber cultivation on soil can be assessed precisely if the changes are monitored in the same field itself at different stages of growth. Accordingly two fields in the second cycle of rubber cultivation in the farm of Rubber Research Institute of India, Kottayam, were selected and monitored for soil organic carbon, pH and available nutrients at the begining of the cycle, after eight years and the end of the cycle. A decline in soil organic carbon status was observed in both the fields after eight years. However, after 25 years, in both the fields a significant increase was noted. Available phosphorus and potassium improved towards the end of the cycle. It is observed that the available calcium was maintained at the end of the cycle, though an increase was noted in between. The changes in available magnesium status in soil was different in the two fields, however, both the fields maintained the medium status throughout the period of cultivation. Siol pH changes were also slightly different in the two fields. In one field, a slight decrease was noted compared to the initial status while in the other a reverse trend was recorded. In general, in both the fields an increase in organic carbon and available form of nutrients in soil was observed towards the end of the cultivation cycle.