Hi everyone I need help with my grow some of my seedlings are turning a little bit yellow I think why would this be?? I am using seed raising mix and R,O water the seedling you see here is 5days old under a BD240D LED some one please help me befor I loose them thanks they are 5 days old how could they have nutrient deficiency???? the seed raising mix has a small amount of nut in it for seedling.
That soil has time released fertilizer + water crystals. Not a good soil for cannabis. My guess is you're either over watering or the seedling is getting cooked by that time released fertilizer.
osmocote ey! an aussie he is! I wouldnt worry too much mate, that soil is pretty good. Its a good quality potting mix but imo (for what its worth) its time to start adding liquid fert once a week. Whilst you're in bunnings/masters ( ) pick up a bottle of Powerfeed. The one in the red bottle. That ones the best. Follow the instructions on the back, but do 1/4 strength. For a full 9L watering can you'll only need to add about 8 ml, or just under one cap. Water her, and watch your darling grow. Ta, Manc.
Any soil that has time released fertilizer and water crystals is not a "good" soil for cannabis. You are telling him to start adding nutrients while there is time released fertilizer in the soil for another 3 months? Bad advice, friend. OP, transplant into soil that doesn't have crap time released fertilizer and water crystals.