PH testing your garden soil can save you tons of money. It basically tells you exactly how to amend you soil so that you don’t have to guess. You can waste a lot of money on fertilizers, etc. with zero benefits, because all you needed to do is change to pH of your soil. Raising or lowering your pH is a fairly simple and cheap task, to make soil more acidic, add finely ground limestone. To make soil more alkaline, add gympsum or ground sulfur.