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Seasonal variation of gypsum blocks in response to soil temperature

This example shows the output for a 15 month period from a Watermark gypsum block installed at a depth of 1.7 m in a paddock at Charles Sturt University.  This paddock was under lucerne until 2002, which dried the soil to almost 6 m.  Since then there has been insufficient rainfall to rewet the soil below 1.3 m, and from neutron moisture meter measurements, we know that the water content at 1.7 m was unchanged from 2002 to the present. The variation in the observed soil water potential follows the seasonal variation in air temperature, with a lag of a few weeks because of the time taken for the soil to heat up and cool down.

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