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RE: Marijuana Indoor growing experiment progress and updates! A week later, slightly yellowing leaves!!
Hey bro are you well? I used to put in chelated iron but I'm worried to fertilise as I plan to use these ??
I'd had over watering issues lately which looks similar to nitrogen toxicity which makes the leaves curl downwards. I recognize your issue (nitrogen deficiency) from my last grow before I added nutrients the leafs were always going yellow. In flower its normal or the leafs to go yellow and fall off, just keep that in mind. The only nutrient I use is a solution that contains seaweed.
Check out this website, great guide to identifying the problem: http://www.growweedeasy.com/marijuana-symptoms
Also make sure you remove the leaves from the top of the soil. Could attract insects and other pests. Maybe its time for a big bucket and new soil the roots grow very quickly.