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Types of Soil          

Sand: Sand is grainy soil that holds little or no compost* or humus.*  It drains very well, and as a result, does not hold water very well. It is also lacking in minerals and micronutrients needed by your plants. Roots* of plants can easily grow and expand through sand. We all know that Cactus grows in sandy soil. But, did you know that peanuts prefer sandy soil too?
Clay: This is the second major type of soil. It is largely the opposite of sand. It retains water and does not drain well. Heavy clay soils can act as a pot, holding water for days as rainwater ever so slowly seeps through it. Roots can actually drown, as there is no air in the soil. Roots have a hard time pushing through it and tend to ball up. 

Loam: This soil contains a mixture of clay, silt, sand, and some organic matter. It retains water well, yet is loose and contains plenty of air pockets for roots to breathe. Best of all, it is rich in minerals and nutrients vital to your plants’ growth and development.   
Humus: Soil containing a rich mixture of decomposed plant or animal matter. It is rich in minerals and nutrients vital to your plants' growth and development.

All soils are composed of a mixture of clay, silt, and sand.  Your exact soil composition will most likely be described as a mixture of two or more of these components.  Soil is a mixture of air, water, and soil particles.   For best growth of your grass, this mixture must be the right balance.  The texture of your soil is the mix of the three basic soil components:

• Sand: Soils with particle sizes ranging from 2.0 (.01 in.) to .05 mm (.002 in.)
• Silt: Soils with particle sizes ranging from .05 (.002 in.) to .002 mm (.0001 in.)
• Clay: Soils with particles sizes smaller than .002 mm (.0001 in.)

Loam: Loam is the ideal soil mixture, consisting of 40% Sand, 40% Silt, and 20% Clay. A loam soil will seem crumbly in comparison to a clay soil that is very tight.  The best soils for grasses are loamy soils with a 40-60% sand component, a 20-30% clay component, and a 20-30% silt component.  Next...