â¢ The response of the innate system is rapid while that of the adaptive immunity is slow (Over 1-2 weeks). â¢ The innate system has limited and lower potency. In contrast, the adaptive system has high potency. â¢ The innate system recognizes a broad range of pathogens, but it cannot make fine distinctions.
As plant roots do not reach this layer, the C horizon is typically devoid of organic matter. R Horizon (Bedrock) The R horizon is basically the deepest soil horizon in the soil profile. Unlike the horizon above, this horizon does not comprise rocks or boulders, but instead is made of continuous mass of bedrock. It is very difficult to dig through this layer.
Texture is silt loam, loam, clay loam or sandy clay loam in the fine earth fraction. It has weak or moderate prismatic structure parting to platy or blocky structure and is firm or very firm and brittle. The C horizon has hue of 2.5Y to 5YR, value of 4 to 6 and chroma of 1 to 6.