Effect ofenvironmental factors on growth Water availability, pH, temperature, oxygen concentration, pressure, radiation and a number of other environmental factors influence microbial growth Yet many microorganismS, and particularly bacteria, have managed to adapt and fourish under environmental extremes that would destroy most organismsWater availability, pH, temperature, oxygen concentration, pressure, radiation, and a number of other environmental factors influence microbial growth. Yet many microorganisms, and particularly bacteria, have managed to adapt and flourish under environmental extremes that would destroy most organisms. Ef ect of environmental factors on growth