Knowing the pH of the soil makes the difference between someone that knows what they are doing, and someone that doesn't. The soil pH is crucial when it comes to nutrient absorption and when the pH is off just a little, it will lock out nutrients. I don't expect anyone who has not had training in Horticulture to know the value of knowing the pH scale and Nutrient absorption. .However it is very important in the Horticulture industry and it means the difference between success and failure.
