I have posted this here because it seems that a Magnesium (Mg) deficiancy seems to be quite common.
If you are using a fertilizer that isn't specifically for marijuanna, check the micro nutrient content; Most of them don't contain any Mg. If you don't have the Mg in the ferts, you need to add a genorous pinch of Epsom Salts to the made up fertilizer solution everytime you fert (per 2 litres of fert). The Epsom salts will cover the plant against an Mg and a sulpher deficiancy. A severe Mg deficiancy usually shows with rustic spots on the leaves and around the edges, which dry up and turn to dust when touched. If you have the advanced stage of deficiancy 1/2 tablespoon of Salts should be added for the first dosage, then the rest as stated above. The affected growth will not recover but the new growth shouldn't have the symptoms.
The epsom salts can be purchased from a chemist/drugstore.
CW.
(Edited by Clueless wanderer at 3:19 am on May 6, 2002)
