I am a fanatic about soil pH, The difference between having a soil at the right pH and not; is the difference of having plants that are flourishing and sustaining. Habanero chiles will produce about 30% more pods if the pH is about 6.8 vs 7.2 and will have blossom end rot if the soil pH is below 6.0 I check my soil pH on a monthly bases, because rain can leach out minerals. A $20 pH meter is close enough for the home gardener. Example. To adjust 1 pH point in a certain type of soil requires 7.5 oz of lime per 100 sq ft. To adjust 0.1 (10%) means 0.75 oz per 100 sq ft. Thats tough enough. How does the home gardener spread 1% or 0.075 oz per 100 sq ft. Byron