TEST METHOD: Turbidity test for sodicity
Revised: 10 June 2002, links to CRC method updated 10 July 2012
Sodicity is an important factor limiting plant growth.
TASK SAFETY REQUIREMENTS
Safety boots are mandatory
|SPECIFIC JOB STEPS||HAZARDS WITHIN THIS STEP||HAZARD CONTROL|
|Weigh 100 g of air dry soil into a 600 mL screwtop glass jar. Add 500 mL of deionised water, by pouring gently down the side of the jar.||Sodic soils take a long time to settle if disturbed.||Avoid disturbing the soil too much. The method uses the minimum replicable disturbance to allow for the shortest settling time.|
|Invert the jar once, and return to original position. Let stand for 4 hours.||Avoid extra shaking or bumping.|
plastic spoon or spatula is placed into the suspension.
If it is:
||Defining visibility can be tricky||
Use photographs such as those provided by the CRC for Soil and Land Management (there is a printed copy in Delta's library, or Part 1 and Part 2 are available online), OR use a marked plastic sodicity dipstick from the same source.
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