For the maintenance of replanted slopes in reclaimed land, method of sodding by spraying seeds is widely adopted. However, only sodding is not sufficient for seeds to germinate well. Some plants wither before their transition to local species. Outcome of replanting depends on the state of maintenance. We examined the effect of additional application of fertilizer (topdressing) to develop a relatively convenient method of maintenance. As a result, topdressing applied once in a later period enabled grasses to grow well, and the rate of canopy was improved. The effect of fertilizer persisted even 4 years after sodding. Since other species than the originally sprayed ones were able to grow, the sustained effect of fertilizer enabled the vegetation to succeed to local species.