Agricultural Gypsum 5lb.
QUESTIONS & ANSWERS
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How much of this would you recommend adding per cubic foot of soil and is there any information on calcium or heavy metal content?
We have heavy metals reports for most amendments we sell. There aren;t any issues with our gypsum in those respects. All amendmning should be based off of test results. Without test results it's a guess at best. That being said, a tablespoon per gallon would be a safe place to start.