The present study investigated the optimum additive ratio of wheat straw pellet as a substitute for beet pulp during oyster mushroom cultivation. The chemical properties across treatments were pH of 4.8–5.5, total carbon content of 45.9–46.5%, total nitrogen content of 1.5–1.7%, and carbon-to-nitrogen ratio of 27.8–31.0. Mycelial growth was the fastest in a medium containing 20% wheat straw pellet (at 88.2 mm in ‘Heuktari’ and 70.3–79.6 mm in ‘Suhan-1Ho’); however, there were no significant differences in mycelial density among the treatments. The characteristics of fruiting bodies by variety were as follows. In ‘Heuktari’, the valid stipe number per bottle (1,100 cc) was 22.5 and yield was 177.1 g/1,100 cc in the mixed medium containing 10% wheat straw pellet, with the values being comparable to those of controls. In ‘Suhan-1Ho’, the valid stipe number per bottle (1,100 cc) was 14.0 and yield was 151.2 g/1,100 cc in the mixed medium containing 10% wheat straw pellet, with the values being comparable to those of controls.

• 최준영(경기도농업기술원) | Jun-Yeong Choi (Gyeonggi-do Agricultural Research & Extension Services, Hwaseong 18388, Korea) Corresponding author
• 김정한(경기도농업기술원) | Jeong-Han Kim (Gyeonggi-do Agricultural Research & Extension Services, Hwaseong 18388, Korea)
• 김연진(경기도농업기술원) | Yeon-Jin Kim (Gyeonggi-do Agricultural Research & Extension Services, Hwaseong 18388, Korea)
• 이채영(경기도농업기술원) | Chae-Young Lee (Gyeonggi-do Agricultural Research & Extension Services, Hwaseong 18388, Korea)
• 백일선(경기도농업기술원) | Il-Seon Baek (Gyeonggi-do Agricultural Research & Extension Services, Hwaseong 18388, Korea)
• 하태문(국립원예특작과학원) | Tai-Moon Ha (National Institute of Horticultural & Herbal Science, RDA, Eumseong 27709, Korea)
• 이찬중(경기도농업기술원) | Chan-Jung Lee (Gyeonggi-do Agricultural Research & Extension Services, Hwaseong 18388, Korea)
• 임갑준(경기도농업기술원) | Gab-June Lim (Gyeonggi-do Agricultural Research & Extension Services, Hwaseong 18388, Korea)