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| Novice Gardener Join Date: Apr 2009
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If anyone out there is using the Rapitest for testing NPK, you will notice in the instructions that is says to wait ten minutes for the solution colors to develop. On a hunch, I emailed Rapitest to ask them if it was OK to wait longer than ten minutes to read the color. Here is what they wrote back: Quote:
Luster Leaf Gardening Products - Soil Test Kits I am using the 1601 kit. | |||
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