PH is generaly lowered by the application of Aluminium Sulphate at rates of around 85gms/14 litres water per 4 square metre. This is a question that really can only be accurately answered by a laboritory test on your soil to determine a starting point, applications etc. You can do your own test using a ‘PH Test Kit’ and then trial increasing application rates with tests run in between to determine progress, but this is a guide only
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