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2. Topsoil - Wikipedia

   en.wikipedia.org/wiki/Topsoil

   Topsoil is composed of mineral particles and organic matter and usually extends to a depth of 5-10 inches (13–25 cm). Together these make a substrate capable of holding water and air which encourages biological activity. There are generally a high concentration of roots in topsoil since this is where plants obtain most of their vital nutrients.

3. Hardpan - Wikipedia

   en.wikipedia.org/wiki/Hardpan

   Hardpan. In soil science, agriculture and gardening, hardpan or soil pan is a dense layer of soil, usually found below the uppermost topsoil layer. [1] There are different types of hardpan, all sharing the general characteristic of being a distinct soil layer that is largely impervious to water. Some hardpans are formed by deposits in the soil ...

4. List of U.S. state soils - Wikipedia

   en.wikipedia.org/wiki/List_of_U.S._state_soils

   A state soil is a soil that has special significance to a particular state. Each state in the United States has selected a state soil, twenty of which have been legislatively established. These official state soils share the same level of distinction as official state flowers and birds. Also, representative soils have been selected for Puerto ...

5. Sod - Wikipedia

   en.wikipedia.org/wiki/Sod

   Sod is the upper layer of turf that is harvested for transplanting. Turf consists of a variable thickness of a soil medium that supports a community of turfgrasses. [1] In British and Australian English, sod is more commonly known as turf, and the word "sod" is limited mainly to agricultural senses.

6. Here are answers to important North Texas lawn-care topics ...

   www.aol.com/answers-important-north-texas-lawn...

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7. Texas State Soil and Water Conservation Board - Wikipedia

   en.wikipedia.org/wiki/Texas_State_Soil_and_Water...

   The Texas State Soil and Water Conservation Board ( TSSWCB) is a state agency of Texas, headquartered in Temple. [1] The agency enforces the state's soil and water conservation laws and coordinates conservation and nonpoint source pollution abatement programs. The Texas State Legislature created the agency in 1939.