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Depth of soil refers to feeding of roots. It is the depth or layer of soil most favorable for growth of roots and for storage of water and plant food, above a layer that differs enough from the overlying material either in chemical or physical properties to seriously slow up or stop root growth. A soil may be shallow over rock, claypan, hardpan, gravel or other material. Very deep-60,” deep-36”-60,” moderate-2-36, in. shalIow-l0”-i20,” very shallow-10”. Claypan is a fine textured compact subsoil layer which integers with water movement or root development. Claypan is not cemented and if put under water can be worked into a soft mass. Hardpan is cemented.
PERMIABILITY
Permiability is the rate of movement of water or air through each soil layer. |Jt may be defined as the capacity of the soil to allow passage of water and air. It refers to the speed that water and air passes through soil’ in terms of inches per hour' Slow permiability is usually associated with heavy soils as clay, loams, and Rapid with light or moderately light textures as friable
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