Svaren jag fick efter en snabb Googling var följande:

*Get epsom salts, I read that it is a magnesium deficiency. I followed the directions on the back of the bag and the leaves have quit turning yellow.

*I’ve read that the reason they turn yellow is because the soil doesn’t have enough nitrogen which is what makes the plant green.

*You should try crushed egg shells around the plant! The calcium soaks in and helps the tomato/Cannabis plant!