EDO , N. Y. and SHAREEF, R. S. (2022) “IMPACT OF DIFFERENT SUBSTRATES OF SPAWN PRODUCTION AND CALCIUM CARBONATE ON THE GROWTH AND YIELD OF OYSTER MUSHROOM (Pleurotus ostreatus)”, Journal of Duhok University, 25(2), pp. 19-26. doi: 10.26682/ajuod.2022.25.2.3.