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2. Atterberg limits - Wikipedia

   en.wikipedia.org/wiki/Atterberg_limits

   Atterberg limits. The Atterberg limits are a basic measure of the critical water contents of a fine-grained soil: its shrinkage limit, plastic limit, and liquid limit. Depending on its water content, soil may appear in one of four states: solid, semi-solid, plastic and liquid. In each state, the consistency and behavior of soil are different ...

3. Infiltration (hydrology) - Wikipedia

   en.wikipedia.org/wiki/Infiltration_(hydrology)

   Cross-section of a hillslope depicting the vadose zone, capillary fringe, water table, and phreatic or saturated zone. (Source: United States Geological Survey.) Infiltration is the process by which water on the ground surface enters the soil. It is commonly used in both hydrology and soil sciences. The infiltration capacity is defined as the ...

4. Universal Soil Loss Equation - Wikipedia

   en.wikipedia.org/wiki/Universal_Soil_Loss_Equation

   The Universal Soil Loss Equation (USLE) is a widely used mathematical model that describes soil erosion processes. [1]Erosion models play critical roles in soil and water resource conservation and nonpoint source pollution assessments, including: sediment load assessment and inventory, conservation planning and design for sediment control, and for the advancement of scientific understanding.

5. Field capacity - Wikipedia

   en.wikipedia.org/wiki/Field_capacity

   Field capacity is the amount of soil moisture or water content held in the soil after excess water has drained away and the rate of downward movement has decreased. This usually occurs two to three days after rain or irrigation in pervious soils of uniform structure and texture. The nominal definition of field capacity (expressed symbolically ...

6. California bearing ratio - Wikipedia

   en.wikipedia.org/wiki/California_bearing_ratio

   The California Bearing Ratio (CBR) is a measure of the strength of the subgrade of a road or other paved area, and of the materials used in its construction. The ratio is measured using a standardized penetration test first developed by the California Division of Highways for highway engineering. [1] Empirical tests measure the strength of the ...

7. Is Wood Ash Good for the Garden? 5 Tips for Using This ... - AOL

   www.aol.com/lifestyle/wood-ash-good-garden-5...

   You need to know your current soil conditions to know what it needs to nourish and support plants. Wood ash also contains 5-7% potassium and 1.5-2% phosphorous, both of which are essential ...

8. Proctor compaction test - Wikipedia

   en.wikipedia.org/wiki/Proctor_compaction_test

   Proctor compaction test. The Proctor compaction test is a laboratory method of experimentally determining the optimal moisture content at which a given soil type will become most dense and achieve its maximum dry density. The test is named in honor of Ralph Roscoe Proctor [de], who in 1933 showed that the dry density of a soil for a given ...

9. Standard penetration test - Wikipedia

   en.wikipedia.org/wiki/Standard_penetration_test

   The standard penetration test (SPT) is an in-situ dynamic penetration test designed to provide information on the geotechnical engineering properties of soil. This test is the most frequently used subsurface exploration drilling test performed worldwide. The test procedure is described in ISO 22476-3, ASTM D1586 [1] and Australian Standards AS ...