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2. Have you tested your garden soil? Here's what you should know

   www.aol.com/tested-garden-soil-heres-know...

   In this vein, a soil test is like a blood test for the soil. Soil tests can be used for four purposes: maintaining proper soil fertility; guiding plant selection; diagnosing plant health issues ...

3. Garden: It is time to test your garden soil - AOL

   www.aol.com/news/garden-time-test-garden-soil...

   Soil testing will answer both questions. Do you know the nutrient level of the soil in your garden? Do you know how much fertilizer to add next season? Soil testing will answer both questions.

4. Soil test - Wikipedia

   en.wikipedia.org/wiki/Soil_test

   A soil test is a laboratory or in-situ analysis to determine the chemical, physical or biological characteristics of a soil. Possibly the most widely conducted soil tests are those performed to estimate the plant-available concentrations of nutrients in order to provide fertilizer recommendations in agriculture.

5. For healthy plants, test your garden's soil for pH level - AOL

   www.aol.com/lifestyle/healthy-plants-test-garden...

   Every plant requires a specific soil pH range within which it can best absorb essential nutrients. Because the optimal range is different for every plant, gardeners should learn the pH ...

6. Soil gradation - Wikipedia

   en.wikipedia.org/wiki/Soil_Gradation

   In soil science, soil gradation is a classification of a coarse-grained soil that ranks the soil based on the different particle sizes contained in the soil. [1] Soil gradation is an important aspect of soil mechanics and geotechnical engineering because it is an indicator of other engineering properties such as compressibility , shear strength ...

7. USDA soil taxonomy - Wikipedia

   en.wikipedia.org/wiki/USDA_soil_taxonomy

   About 1,000 soil subgroups are defined in the United States. [6] A soil family category is a group of soils within a subgroup and describes the physical and chemical properties which affect the response of soil to agricultural management and engineering applications. The principal characteristics used to differentiate soil families include ...