Sustainable intensification of forage production in arid regions requires strategies that enhance yield while minimizing environmental impacts. Organic amendments improve soil health by increasing soil organic matter; however, their effectiveness compared to mineral fertilizers with increased cutting frequency remains unclear. A two-year field study (2022-2023) evaluated the effects of nitrogen sources, including control (CK), urea (UF), cow manure compost (CMC), and poultry manure compost (PMC), and cutting frequencies (3 and 5 cuttings/ year) on forage yield, quality, and greenhouse gas (GHG) emissions in alfalfa-tall fescue mixtures in arid conditions. Increasing cutting frequency from 3 to 5 resulted in a 5.8 % to 6.2 % increase in dry matter yield (DMY), 5.9 % to 15.4 % increase in crude protein yield (CPY), 4.3 % to 6.7 % increase in relative feed value (RFV), and 5.6 % to 5.8 % increase in nitrogen use efficiency (NUE) with urea fertilization, but had no significant effect with CK, CMC, and PMC. Urea fertilization with 5 cuttings (UF-5) produced the highest DMY (13,721 kg ha-1 and 14,074 kg ha-1) and CPY (1989 kg ha-1 and 2376 kg ha-1) in 2022 and 2023, respectively, outperforming organic amendments. UF-5 also reduced fiber contents (ADF and NDF), improving forage quality. Although urea fertilization increased nitrous oxide (N2O) fluxes, the global warming potential (GWP) and greenhouse gas intensity (GHGI) were lowest with UF-5, due to increased methane (CH4) uptake and reduced carbon dioxide (CO2) emissions. Organic composts improved soil organic carbon (SOC) but did not maintain high productivity. These findings demonstrate that urea fertilization with increased cutting frequency optimizes forage yield while minimizing GHGI in arid grasslands. The slow nitrogen release from organic amendments limits their effectiveness, making mineral nitrogen sources more efficient in intensified cutting regimes.