What is the best way to measure pH in soil samples?
When testing the pH of soil based samples it is advisable to use a pH probe with a strong glass tip and high electrolyte outflow. Mix 5 g of the soil sample with 25 g of deionized water while stirring carefully. Let the mixture stand without stirring for 10 minutes to seperate the particles from the liquid. Insert the pH probe in such a way that the glass bulb is totally covered by particles, but the diaphragm is not. Wait for a stable reading.