Soil wet enough? Gypsum blocks will tell you.
From: Sunset
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Date: 8/1/1990
Soil wet enough? Gypsum blocks will tell you New technology has made an old tool for measuring soil moisture--the gypsum-block moisture sensor--more reliable than it used to be. And now these sensors are available to home gardeners at prices that make them an attractive alternative to more expensive types of moisture sensing devices for use on deep-rooted landscape plants. For about $250 you can monitor soil moisture levels at up to 10 different locations in your garden.
Gypsum ...
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