Aluminum levels in soil
I did something last year to a 8'x 13' section of land I intended to plant blueberries in. I applied 2 kg of aluminum sulphate to lower the ph. There was no "sulphur" available and only this stuff. Since then my mind has changed and want to plant fruit trees instead. Is there enough aluminum in the soil now in this area to harm the fruit trees?
what is a safe level of aluminum in ppm measurement?