I have been studying PH some as I never gave it much thought. Here is what Google says about fruit trees and PH.
Most fruit trees prefer a slightly acidic soil pH between 6.0 and 6.5 for optimal nutrient absorption. A range of 5.5 to 7.0 is generally acceptable, with well-drained, nutrient-rich soil being crucial. Blueberries are a notable exception, requiring acidic soil 4.5 - 5.2.
Preferred Soil pH List for Fruit Trees
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Apple: 6.0 – 7.0
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Apricot: 6.7 – 7.5
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Blueberry: 4.5 – 5.2
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Cherry: 6.0 – 7.0
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Citrus (Lemon/Orange): 6.0 – 7.5 (6.5 ideal)
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Fig: 6.0 – 7.0
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Peach: 6.0 – 7.0
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Pear: 6.0 – 7.0
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Plum: 6.0 – 7.0
Key Considerations
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Optimal Range: While 6.0–6.5 is ideal for most, a broader range of 5.5 to 7.5 is usually tolerable if nutrients are balanced.
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High/Low pH Issues: If soil is below 5.0, nutrients like aluminum, iron, and manganese can reach toxic levels, while above 7.5, calcium and potassium may become too high.
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Adjusting pH: Use lime to raise pH (less acidic) and elemental sulfur to lower pH (more acidic).
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Soil Structure: In addition to pH, fruit trees require well-drained, deep, and loamy soil.
