PH matters because every nutrient the plant needs has a range in which it may be absorbed. Get outside that range, and you will have nutrient deficiencies. The "perfect" ph is the number where most of the ranges overlap. However, other variables that affect nutrient uptake include organic matter content, humates, and having an overall healthy soil biology, with rich bacterial and fungal life. The better your soil is, the less perfect you have to be on ph. In fact, if your plants do not display nutrient deficiencies, your ph is fine, regardless of the number that it tests.
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