I took about ½ cup, of the potting soil I use, out of the bag and put it in a bowl. I poured about 1 cup of distilled water (PH neutral; 7) into the dirt and mixed it thoroughly and let it sit/soak for 1 hour. I then poured the water through a screened funnel (to get as much dirt out as possible) and into a glass. Using Merck universal indicator strips (litmus paper), I wetted the strip, and checked against the color chart. The green color was the only one that didn’t quite match; it was darker than the “5” but lighter than the “6”. Close enough for government work. So now I know it’s about 5.5 to 6.0 which is ideal.
The strips can be gotten from
CTi & Science Co., LTD.
E-mail; cti@cti.th.com
Web; www.cti.th.com
The strips cost ฿350/100, which is about $12 USD.
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