Blueberries are one of the most pH-sensitive fruits a home gardener can grow. Optimal development requires a consistent soil pH between 4.5 and 5.5. Outside that narrow window, key nutrients like iron and manganese become chemically unavailable to the plant — leading to yellowing foliage, poor fruit set, and stunted growth regardless of how much fertilizer you apply. The Soil pH Tracking Log was specifically designed to help growers maintain visibility on this critical variable throughout the growing season.