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Slurry application with methods such as trailing shoe (TS) results in reduced emissions of ammonia (NH₃) compared with broadcast application using splashplate (SP). Timing the application during cool and wet weather conditions also contributes to low NH₃ emissions. From this perspective, we investigated whether reduced NH₃ emissions due to improved slurry application method and timing results in an increase in the nitrogen (N) fertilizer replacement value (NFRV). The effects of application timing (June vs. April) and application method (TS vs. SP) on the apparent N recovery (ANR) and NFRV from cattle slurry applied to grassland were examined on three sites over 3 yr in randomized block experiments. The NFRV was calculated using two methods: (i) NFRV_N based on the ANR of slurry N relative to mineral N fertilizer; and (ii) NFRV_DM based on DM yield. The TS method increased the ANR, NFRV_N, and …