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¹ Ahi Evran Üniversitesi, Ziraat Fakültesi, Tarla Bitkileri Bölümü, Kırşehir DOI : 10.21566/tarbitderg.323592 - This study was carried out to determine the effects of three different cutting stages on forage yield and quality of pea (Pisum sativum L.) and oat (Avena sativa L.) mixtures in Kırşehir ecological conditions in 2013- 2015. In this study, which was conducted in randomized complete split-block design, pure sowings and five different mixture ratios of pea and oat were investigated. Cutting stages (beginning of flowering, full flowering, and pod binding) were designed as main plot, mixtures (100% P, 100% O, 70% P + 30% O, 60% P + 40% O, 50% P + 50% O, 40% P + 60% O, and 30% P + 70% O) as subplot. When considered mixture and cutting stage separately, the highest forage yield was obtained from 30% pea + 70% oat mixture (509.1 kg/da) and pod binding stage (465,9 kg/da). In mixture, the lowest ADF and NDF with highest crude protein ratios were obtained from in pure sowing of pea as 30.33%, 40.15%, and 17.54% respectively. At the beginning of flowering in cutting stages, these values were 32,53%, 42,27%, and 15.39% in the same order. The results showed that when the proportion of oat in planting of mixtures increased, forage yield increased. However, ADF and NDF ratios increasing with forage yield caused decreases in forage quality parameters such as crude protein, TDN and RFV values. It was determined that when cutting stages progress from the beginning of flowering to pod binding period, forage yields increased, but quality characteristics decreased. To conclude, 30% pea + 70% oat mixture can be grown to obtain higher forage yield. When evaluated the quality parameters with forage yield, suggesting that 60% pea + 40% oat or 50% pea + 50% oat mixtures can be harvested at the beginning of flowering. Keywords : Pea, oat, mixture, forage yield, forage quality