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Fertilizer does influence the pH of your growing medium!
Acidic fertilizers, depending our your inputs could decrease the pH of your growing medium.
Basic fertilizers which are alkaline can increase the pH of growing medium.
Acidity and basicity of your fertilizer is based on its nitrogen form.
For example, nitrate nitrogen is your alkaline form (basic) of fertilizer. Ammoniacal nitrogen or urea is your acidic fertilizer.
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