Cannabis & OHD, page-92

The OHD liquor did not eliminate the Ca deficiency symptoms.

A soil application of calcium eliminates Ca deficiency and this soil Ca application is much cheaper, more effective and more long lasting than frequent foliar applications of OHD liquor.

The correct experiment would be to apply to the soil all the essential nutrients (NKP, Ca etc; depending on the soil chemical analysis), so that all the plants are not nutritionally stressed (as correctly practiced for tomatoes under glasshouse hydroponics and fertigation in the field), and only then can you apply the OHD liquor (to a select number of plants, with control plants untreated) to see if there is any benefit. It is not rocket science !