I have to disagree there Bongo....just because you put things in soil at proper ph doesn't in ANY way mean its going to stay there. There are ALL SORTS of reactions to and in soil and the plant going on at any given time. Assuming your soil ph is the same as your water ph is a bad mistake imo. ALL good growers check and keep both adjusted to proper level. Can you do less......of course! But you will wasting something....be it time, energy, yield or your plant's health.