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2. Available water capacity - Wikipedia

   en.wikipedia.org/wiki/Available_water_capacity

   The concept, put forward by Frank Veihmeyer and Arthur Hendrickson, [3] assumed that the water readily available to plants is the difference between the soil water content at field capacity (θ fc) and permanent wilting point (θ pwp): θ a ≡ θ fc − θ pwp

3. Permeability of soils - Wikipedia

   en.wikipedia.org/wiki/Permeability_of_soils

   Soil aeration maintains oxygen levels in the plants' root zone, needed for microbial and root respiration, and important to plant growth.Additionally, oxygen levels regulate soil temperatures and play a role in some chemical processes that support the oxidation of elements like Mn 2+ and Fe 2+ that can be toxic.

4. Sodium adsorption ratio - Wikipedia

   en.wikipedia.org/wiki/Sodium_adsorption_ratio

   The sodium adsorption ratio (SAR) is an irrigation water quality parameter used in the management of sodium-affected soils.It is an indicator of the suitability of water for use in agricultural irrigation, as determined from the concentrations of the main alkaline and earth alkaline cations present in the water.

5. Permanent wilting point - Wikipedia

   en.wikipedia.org/wiki/Permanent_wilting_point

   The concept was introduced in the early 1910s. Lyman Briggs and Homer LeRoy Shantz (1912) proposed the wilting coefficient, which is defined as the percentage water content of a soil when the plants growing in that soil are first reduced to a wilted condition from which they cannot recover in approximately saturated atmosphere without the addition of water to the soil.

6. Field capacity - Wikipedia

   en.wikipedia.org/wiki/Field_capacity

   Field capacity is characterized by measuring water content after wetting a soil profile, covering it (to prevent evaporation), and monitoring the change soil moisture in the profile. A relatively low rate of change indicates when macropore drainage ceases, which is called Field Capacity; it is also termed drained upper limit (DUL).

7. The Best Soil Test Kits Will Help You Grow Your Perfect Garden

   www.aol.com/lifestyle/best-soil-test-kits-help...

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